From b8bacbde8b2ea612bbd79f0621e6847acf731846 Mon Sep 17 00:00:00 2001
From: ConnorSkees <39542938+ConnorSkees@users.noreply.github.com>
Date: Sat, 1 Feb 2020 23:09:22 -0500
Subject: [PATCH] Refactor tests into separate files

---
 tests/comments.rs      |  55 +++
 tests/functions.rs     |  30 ++
 tests/imports.rs       |  31 ++
 tests/interpolation.rs |  15 +
 tests/macros.rs        |  33 ++
 tests/main.rs          | 876 -----------------------------------------
 tests/misc.rs          |  30 ++
 tests/mixins.rs        | 166 ++++++++
 tests/selectors.rs     | 234 +++++++++++
 tests/styles.rs        | 127 ++++++
 tests/units.rs         |  11 +
 tests/values.rs        |  51 +++
 tests/variables.rs     | 100 +++++
 13 files changed, 883 insertions(+), 876 deletions(-)
 create mode 100644 tests/comments.rs
 create mode 100644 tests/functions.rs
 create mode 100644 tests/imports.rs
 create mode 100644 tests/interpolation.rs
 create mode 100644 tests/macros.rs
 delete mode 100644 tests/main.rs
 create mode 100644 tests/misc.rs
 create mode 100644 tests/mixins.rs
 create mode 100644 tests/selectors.rs
 create mode 100644 tests/styles.rs
 create mode 100644 tests/units.rs
 create mode 100644 tests/values.rs
 create mode 100644 tests/variables.rs

diff --git a/tests/comments.rs b/tests/comments.rs
new file mode 100644
index 0000000..f09729a
--- /dev/null
+++ b/tests/comments.rs
@@ -0,0 +1,55 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    removes_inner_comments,
+    "a {\n  color: red/* hi */;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    removes_inner_comments_whitespace,
+    "a {\n  color: red    /* hi */;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    preserves_outer_comments_before,
+    "a {\n  /* hi */\n  color: red;\n}\n"
+);
+test!(
+    preserves_outer_comments_after,
+    "a {\n  color: red;\n  /* hi */\n}\n"
+);
+test!(
+    preserves_outer_comments_two,
+    "a {\n  /* foo */\n  /* bar */\n  color: red;\n}\n"
+);
+test!(
+    preserves_toplevel_comment_before,
+    "/* foo */\na {\n  color: red;\n}\n"
+);
+test!(
+    preserves_toplevel_comment_after,
+    "a {\n  color: red;\n}\n/* foo */\n"
+);
+test!(
+    removes_single_line_comment,
+    "// a { color: red }\na {\n  height: 1 1px;\n}\n",
+    "a {\n  height: 1 1px;\n}\n"
+);
+test!(
+    converts_form_feed_in_comment,
+    "a {\n  /*  \x0C*/ color: red;\n}\n",
+    "a {\n  /*  \n*/\n  color: red;\n}\n"
+);
+test!(
+    converts_crlf_in_comment,
+    "a {\n  /*  \r\n*/ color: red;\n}\n",
+    "a {\n  /*  \n*/\n  color: red;\n}\n"
+);
+test!(
+    converts_cr_in_comment,
+    "a {\n  /*  \r*/ color: red;\n}\n",
+    "a {\n  /*  \n*/\n  color: red;\n}\n"
+);
diff --git a/tests/functions.rs b/tests/functions.rs
new file mode 100644
index 0000000..8b713b4
--- /dev/null
+++ b/tests/functions.rs
@@ -0,0 +1,30 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    return_num,
+    "@function a() {\n  @return 1;\n}\n\nb {\ncolor: a();\n}\n",
+    "b {\n  color: 1;\n}\n"
+);
+test!(
+    return_spaced_list,
+    "@function a() {\n  @return a b;\n}\n\nb {\ncolor: a();\n}\n",
+    "b {\n  color: a b;\n}\n"
+);
+test!(
+    single_arg,
+    "@function a($c) {\n  @return $c;\n}\n\nb {\ncolor: a(1);\n}\n",
+    "b {\n  color: 1;\n}\n"
+);
+test!(
+    return_variable,
+    "@function a($a) {\n  @return $a;\n}\n\nb {\ncolor: a(1);\n}\n",
+    "b {\n  color: 1;\n}\n"
+);
+// test!(
+//     return_no_semicolon,
+//     "@function a() {\n  @return 1\n}\n\nb {\ncolor: a();\n}\n",
+//     "b {\n  color: 1;\n}\n"
+// );
diff --git a/tests/imports.rs b/tests/imports.rs
new file mode 100644
index 0000000..0778abc
--- /dev/null
+++ b/tests/imports.rs
@@ -0,0 +1,31 @@
+use std::io::Write;
+use tempfile::Builder;
+
+use grass::StyleSheet;
+
+macro_rules! test_import {
+    ($func:ident, $input:literal => $output:literal | $( $name:literal($content:literal) ),*) => {
+        #[test]
+        fn $func() {
+            $(
+                let mut f = Builder::new().rand_bytes(0).prefix("").suffix($name).tempfile_in("").unwrap();
+                write!(f, $content).unwrap();
+            )*
+            let mut buf = Vec::new();
+            StyleSheet::new($input)
+            .expect(concat!("failed to parse in "))
+            .print_as_css(&mut buf)
+            .expect(concat!("failed to pretty print on ", $input));
+            assert_eq!(
+                String::from($output),
+                String::from_utf8(buf).expect("produced invalid utf8")
+            );
+        }
+    }
+}
+
+// we have to use test name as filename because tests are run multithreaded in the same directory, so some names may conflict
+test_import!(imports_variable, "@import \"imports_variable\";\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "imports_variable"("$a: red;"));
+test_import!(single_quotes_import, "@import 'single_quotes_import';\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "single_quotes_import"("$a: red;"));
+test_import!(finds_name_scss, "@import \"finds_name_scss\";\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "finds_name_scss.scss"("$a: red;"));
+test_import!(finds_underscore_name_scss, "@import \"finds_underscore_name_scss\";\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "_finds_underscore_name_scss.scss"("$a: red;"));
diff --git a/tests/interpolation.rs b/tests/interpolation.rs
new file mode 100644
index 0000000..b172e26
--- /dev/null
+++ b/tests/interpolation.rs
@@ -0,0 +1,15 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    removes_double_quotes,
+    "a {\n  color: #{\"red\"};\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    removes_single_quotes,
+    "a {\n  color: #{'red'};\n}\n",
+    "a {\n  color: red;\n}\n"
+);
diff --git a/tests/macros.rs b/tests/macros.rs
new file mode 100644
index 0000000..54c6b43
--- /dev/null
+++ b/tests/macros.rs
@@ -0,0 +1,33 @@
+#![cfg(test)]
+
+#[allow(unused_macros)]
+macro_rules! test {
+    ($func:ident, $input:literal) => {
+        #[test]
+        fn $func() {
+            let mut buf = Vec::new();
+            grass::StyleSheet::new($input)
+            .expect(concat!("failed to parse on ", $input))
+            .print_as_css(&mut buf)
+            .expect(concat!("failed to pretty print on ", $input));
+            assert_eq!(
+                String::from($input),
+                String::from_utf8(buf).expect("produced invalid utf8")
+            );
+        }
+    };
+    ($func:ident, $input:literal, $output:literal) => {
+        #[test]
+        fn $func() {
+            let mut buf = Vec::new();
+            grass::StyleSheet::new($input)
+                .expect(concat!("failed to parse on ", $input))
+                .print_as_css(&mut buf)
+                .expect(concat!("failed to pretty print on ", $input));
+            assert_eq!(
+                String::from($output),
+                String::from_utf8(buf).expect("produced invalid utf8")
+            );
+        }
+    };
+}
\ No newline at end of file
diff --git a/tests/main.rs b/tests/main.rs
deleted file mode 100644
index 28c896b..0000000
--- a/tests/main.rs
+++ /dev/null
@@ -1,876 +0,0 @@
-#![cfg(test)]
-
-use grass::StyleSheet;
-
-macro_rules! test {
-    ($func:ident, $input:literal) => {
-        #[test]
-        fn $func() {
-            let mut buf = Vec::new();
-            StyleSheet::new($input)
-                .expect(concat!("failed to parse on ", $input))
-                .print_as_css(&mut buf)
-                .expect(concat!("failed to pretty print on ", $input));
-            assert_eq!(
-                String::from($input),
-                String::from_utf8(buf).expect("produced invalid utf8")
-            );
-        }
-    };
-    ($func:ident, $input:literal, $output:literal) => {
-        #[test]
-        fn $func() {
-            let mut buf = Vec::new();
-            StyleSheet::new($input)
-                .expect(concat!("failed to parse on ", $input))
-                .print_as_css(&mut buf)
-                .expect(concat!("failed to pretty print on ", $input));
-            assert_eq!(
-                String::from($output),
-                String::from_utf8(buf).expect("produced invalid utf8")
-            );
-        }
-    };
-}
-
-mod test_variables {
-    use super::*;
-    test!(
-        basic_variable,
-        "$height: 1px;\na {\n  height: $height;\n}\n",
-        "a {\n  height: 1px;\n}\n"
-    );
-    test!(
-        variable_redeclaration,
-        "$a: 1px;\n$a: 2px;\na {\n  height: $a;\n}\n",
-        "a {\n  height: 2px;\n}\n"
-    );
-    test!(
-        variable_shadowing,
-        "$a: 1px;\n$b: $a;\na {\n  height: $b;\n}\n",
-        "a {\n  height: 1px;\n}\n"
-    );
-    test!(
-        variable_shadowing_val_does_not_change,
-        "$a: 1px;\n$b: $a; $a: 2px;\na {\n  height: $b;\n}\n",
-        "a {\n  height: 1px;\n}\n"
-    );
-    test!(
-        variable_shadowing_val_does_not_change_complex,
-        "a {\n  color: red;\n}\n$y: before;\n$x: 1 2 $y;\n$y: after;\nfoo {\n  a: $x;\n}",
-        "a {\n  color: red;\n}\n\nfoo {\n  a: 1 2 before;\n}\n"
-    );
-    test!(
-        variable_whitespace,
-        "$a   :    1px   ;\na {\n  height: $a;\n}\n",
-        "a {\n  height: 1px;\n}\n"
-    );
-    test!(
-        style_after_variable,
-        "$a: 1px;\na {\n  height: $a;\n  color: red;\n}\n",
-        "a {\n  height: 1px;\n  color: red;\n}\n"
-    );
-    test!(
-        literal_and_variable_as_val,
-        "$a: 1px;\na {\n  height: 1 $a;\n}\n",
-        "a {\n  height: 1 1px;\n}\n"
-    );
-    test!(
-        literal_and_variable_as_var,
-        "$a: 1px;\n$b: 1 $a;\na {\n  height: $b;\n}\n",
-        "a {\n  height: 1 1px;\n}\n"
-    );
-    test!(
-        eats_whitespace_after_variable_value,
-        "a {\n  b {\n    $c: red;\n  }\n  color: red;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        variable_changes_through_new_ruleset,
-        "a {\n  $c: red;\nb {\n    $c: blue;\n  }\n  color: $c;\n}\n",
-        "a {\n  color: blue;\n}\n"
-    );
-    test!(
-        nested_interpolation,
-        "$a: red; a {\n  color: #{#{$a}};\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        numbers_in_variable,
-        "$var1: red; a {\n  color: $var1;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        default_var_after,
-        "$a: red;\n$a: blue !default;\na {\n  color: $a;\n}",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        default_var_before,
-        "$a: red !default;\n$a: blue;\na {\n  color: $a;\n}",
-        "a {\n  color: blue;\n}\n"
-    );
-    test!(
-        default_var_whitespace,
-        "$a: red     !default          ;\na {\n  color: $a;\n}",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        default_var_inside_rule,
-        "a {\n  $a: red;\n  $a: blue !default;\n  color: $a;\n}",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        interpolation_in_variable,
-        "$a: #{red};\na {\n  color: $a\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        variable_decl_doesnt_end_in_semicolon,
-        "a {\n  $a: red\n}\n\nb {\n  color: blue;\n}\n",
-        "b {\n  color: blue;\n}\n"
-    );
-}
-
-mod test_selectors {
-    use super::StyleSheet;
-    test!(
-        selector_nesting_el_mul_el,
-        "a, b {\n  a, b {\n  color: red\n}\n}\n",
-        "a a, a b, b a, b b {\n  color: red;\n}\n"
-    );
-    test!(selector_element, "a {\n  color: red;\n}\n");
-    test!(selector_id, "#id {\n  color: red;\n}\n");
-    test!(selector_class, ".class {\n  color: red;\n}\n");
-    test!(selector_el_descendant, "a a {\n  color: red;\n}\n");
-    test!(selector_universal, "* {\n  color: red;\n}\n");
-    test!(selector_el_class_and, "a.class {\n  color: red;\n}\n");
-    test!(selector_el_id_and, "a#class {\n  color: red;\n}\n");
-    test!(
-        selector_el_class_descendant,
-        "a .class {\n  color: red;\n}\n"
-    );
-    test!(selector_el_id_descendant, "a #class {\n  color: red;\n}\n");
-    test!(
-        selector_el_universal_descendant,
-        "a * {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_universal_el_descendant,
-        "* a {\n  color: red;\n}\n"
-    );
-
-    test!(selector_attribute_any, "[attr] {\n  color: red;\n}\n");
-    test!(
-        selector_attribute_any_lower_case_insensitive,
-        "[attr=val i] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_any_upper_case_insensitive,
-        "[attr=val I] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_arbitrary_modifier,
-        "[attr=val c] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_i_in_attr,
-        "[atitr=val] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_i_in_val,
-        "[attr=vail] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_whitespace,
-        "[attr   *=   val      ] {\n  color: red;\n}\n",
-        "[attr*=val] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_equals,
-        "[attr=val] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_single_quotes,
-        "[attr='val'] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_double_quotes,
-        "[attr=\"val\"] {\n  color: red;\n}\n"
-    );
-    test!(selector_attribute_in, "[attr~=val] {\n  color: red;\n}\n");
-    test!(
-        selector_attribute_begins_hyphen_or_exact,
-        "[attr|=val] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_starts_with,
-        "[attr^=val] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_ends_with,
-        "[attr$=val] {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_attribute_contains,
-        "[attr*=val] {\n  color: red;\n}\n"
-    );
-    test!(selector_el_attribute_and, "a[attr] {\n  color: red;\n}\n");
-    test!(
-        selector_el_attribute_descendant,
-        "a [attr] {\n  color: red;\n}\n"
-    );
-    test!(selector_el_mul_el, "a, b {\n  color: red;\n}\n");
-    test!(
-        selector_el_immediate_child_el,
-        "a > b {\n  color: red;\n}\n"
-    );
-    test!(selector_el_following_el, "a + b {\n  color: red;\n}\n");
-    test!(selector_el_preceding_el, "a ~ b {\n  color: red;\n}\n");
-    test!(selector_pseudo, ":pseudo {\n  color: red;\n}\n");
-    test!(selector_el_and_pseudo, "a:pseudo {\n  color: red;\n}\n");
-    test!(
-        selector_el_pseudo_descendant,
-        "a :pseudo {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_pseudo_el_descendant,
-        ":pseudo a {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_pseudo_paren_comma,
-        ":pseudo(a, b, c) {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_pseudo_paren_space,
-        ":pseudo(a b c) {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_el_pseudo_paren_and,
-        "a:pseudo(a, b, c) {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_el_pseudo_paren_descendant,
-        "a :pseudo(a, b, c) {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_pseudo_paren_el_descendant,
-        ":pseudo(a, b, c) a {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_pseudo_paren_el_nested,
-        "a {\n  :pseudo(a, b, c) {\n  color: red;\n  }\n}\n",
-        "a :pseudo(a, b, c) {\n  color: red;\n}\n"
-    );
-    test!(selector_mul, "a, b {\n  color: red;\n}\n");
-    test!(
-        outer_ampersand,
-        "a, b {\n& c {\n  color: red;\n}\n}\n",
-        "a c, b c {\n  color: red;\n}\n"
-    );
-    test!(
-        inner_ampersand,
-        "a, b {\na & c {\n  color: red;\n}\n}\n",
-        "a a c, a b c {\n  color: red;\n}\n"
-    );
-    test!(
-        ampersand_multiple_whitespace,
-        " a  ,  b   {\n&c {\n  color: red;\n}\n}\n",
-        "ac, bc {\n  color: red;\n}\n"
-    );
-    test!(
-        ampersand_alone,
-        "a, b {\n& {\n  color: red;\n}\n}\n",
-        "a, b {\n  color: red;\n}\n"
-    );
-    test!(
-        bem_dash_dash_selector,
-        "a {\n&--b {\n  color: red;\n}\n}\n",
-        "a--b {\n  color: red;\n}\n"
-    );
-    // test!(
-    //     bem_underscore_selector,
-    //     "a {\n&__b {\n  color: red;\n}\n}\n",
-    //     "a__b {\n  color: red;\n}\n"
-    // );
-    test!(
-        selector_interpolation_start,
-        "#{a}bc {\n  color: red;\n}\n",
-        "abc {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_interpolation_middle,
-        "a#{b}c {\n  color: red;\n}\n",
-        "abc {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_interpolation_end,
-        "ab#{c} {\n  color: red;\n}\n",
-        "abc {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_interpolation_variable,
-        "$a: foo;\nab#{$a} {\n  color: red;\n}\n",
-        "abfoo {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_interpolation_super_selector,
-        "a {\nb #{&} { color: red; }}",
-        "a b a {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_interpolation_super_selector_root_postfix,
-        "a#{&} {\nb { color: red; }}",
-        "a b {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_interpolation_super_selector_root_prefix,
-        "#{&}a {\nb { color: red; }}",
-        "a b {\n  color: red;\n}\n"
-    );
-    test!(
-        selector_whitespace,
-        "  a  >  b  ,  c  ~  d  e  .f  #g  :h  i.j  [  k  ]  { color: red }",
-        "a > b, c ~ d e .f #g :h i.j [k] {\n  color: red;\n}\n"
-    );
-    test!(
-        comment_between_selectors,
-        "a /* foo */ b {\n  color: red;\n}\n",
-        "a b {\n  color: red;\n}\n"
-    );
-    test!(
-        interpolates_comma,
-        "$x: oo, ba;\nf#{$x}r {\n  baz {\n    color: red;\n  }\n}\n",
-        "foo baz, bar baz {\n  color: red;\n}\n"
-    );
-    test!(
-        extra_commas,
-        "div,, , span, ,, {\n  color: red;\n}\n",
-        "div, span {\n  color: red;\n}\n"
-    );
-    test!(
-        combinator_following,
-        "a + {\n  b {\n    color: red;\n  }\n}\n",
-        "a + b {\n  color: red;\n}\n"
-    );
-    test!(
-        combinator_preceding,
-        "a {\n  + b {\n    color: red;\n  }\n}\n",
-        "a + b {\n  color: red;\n}\n"
-    );
-    test!(
-        combinator_alone,
-        "a {\n  + {\n    b {\n      color: red;\n  }\n}\n",
-        "a + b {\n  color: red;\n}\n"
-    );
-}
-
-mod test_units {
-    use super::StyleSheet;
-    test!(unit_none, "a {\n  height: 1;\n}\n");
-    test!(unit_not_attached, "a {\n  height: 1 px;\n}\n");
-    test!(unit_px, "a {\n  height: 1px;\n}\n");
-    test!(unit_em, "a {\n  height: 1em;\n}\n");
-    test!(unit_rem, "a {\n  height: 1rem;\n}\n");
-    test!(unit_percent, "a {\n  height: 1%;\n}\n");
-}
-
-mod test_comments {
-    use super::StyleSheet;
-    test!(
-        removes_inner_comments,
-        "a {\n  color: red/* hi */;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        removes_inner_comments_whitespace,
-        "a {\n  color: red    /* hi */;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        preserves_outer_comments_before,
-        "a {\n  /* hi */\n  color: red;\n}\n"
-    );
-    test!(
-        preserves_outer_comments_after,
-        "a {\n  color: red;\n  /* hi */\n}\n"
-    );
-    test!(
-        preserves_outer_comments_two,
-        "a {\n  /* foo */\n  /* bar */\n  color: red;\n}\n"
-    );
-    test!(
-        preserves_toplevel_comment_before,
-        "/* foo */\na {\n  color: red;\n}\n"
-    );
-    test!(
-        preserves_toplevel_comment_after,
-        "a {\n  color: red;\n}\n/* foo */\n"
-    );
-    test!(
-        removes_single_line_comment,
-        "// a { color: red }\na {\n  height: 1 1px;\n}\n",
-        "a {\n  height: 1 1px;\n}\n"
-    );
-    test!(
-        converts_form_feed_in_comment,
-        "a {\n  /*  \x0C*/ color: red;\n}\n",
-        "a {\n  /*  \n*/\n  color: red;\n}\n"
-    );
-    test!(
-        converts_crlf_in_comment,
-        "a {\n  /*  \r\n*/ color: red;\n}\n",
-        "a {\n  /*  \n*/\n  color: red;\n}\n"
-    );
-    test!(
-        converts_cr_in_comment,
-        "a {\n  /*  \r*/ color: red;\n}\n",
-        "a {\n  /*  \n*/\n  color: red;\n}\n"
-    );
-}
-
-mod test_styles {
-    use super::StyleSheet;
-    test!(basic_style, "a {\n  color: red;\n}\n");
-    test!(two_styles, "a {\n  color: red;\n  color: blue;\n}\n");
-    test!(
-        two_inner_rulesets,
-        "a {\n  b {\n  color: red;\n}\n  c {\n  color: white;\n}\n}\n",
-        "a b {\n  color: red;\n}\na c {\n  color: white;\n}\n"
-    );
-    test!(
-        two_rulesets,
-        "a {\n  color: red;\n}\n\nc {\n  color: white;\n}\n"
-    );
-    test!(
-        two_rulesets_first_no_semicolon,
-        "a {\n  color: red\n}\nc {\n  color: white;\n}\n",
-        "a {\n  color: red;\n}\n\nc {\n  color: white;\n}\n"
-    );
-    test!(
-        two_inner_outer_rulesets,
-        "a {\n  b {\n  color: red;\n}\n  c {\n  color: white;\n}\n}\na {\n  b {\n  color: red;\n}\n  c {\n  color: white;\n}\n}\n",
-        "a b {\n  color: red;\n}\na c {\n  color: white;\n}\n\na b {\n  color: red;\n}\na c {\n  color: white;\n}\n"
-    );
-    test!(
-        removes_empty_outer_styles,
-        "a {\n  b {\n    color: red;\n  }\n",
-        "a b {\n  color: red;\n}\n"
-    );
-    test!(removes_empty_styles, "a {}\n", "");
-    test!(
-        doesnt_eat_style_after_ruleset,
-        "a {\n  b {\n  color: red;\n}\n  color: blue;\n}\n",
-        "a {\n  color: blue;\n}\na b {\n  color: red;\n}\n"
-    );
-    test!(
-        multiline_style,
-        "a {\n  color: red\n  blue;\n}\n",
-        "a {\n  color: red blue;\n}\n"
-    );
-    test!(hyphenated_style_property, "a {\n  font-family: Arial;\n}\n");
-    test!(hyphenated_style_value, "a {\n  color: Open-Sans;\n}\n");
-    test!(
-        space_separated_style_value,
-        "a {\n  border: solid red;\n}\n"
-    );
-    test!(single_quoted_style_value, "a {\n  font: 'Open-Sans';\n}\n");
-    test!(
-        double_quoted_style_value,
-        "a {\n  font: \"Open-Sans\";\n}\n"
-    );
-    test!(
-        comma_style_value,
-        "a {\n  font: Open-Sans, sans-serif;\n}\n"
-    );
-    test!(
-        style_interpolation_start,
-        "a {\n  #{c}olor: red;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        style_interpolation_middle,
-        "a {\n  co#{l}or: red;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        style_interpolation_end,
-        "a {\n  colo#{r}: red;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        style_interpolation_variable,
-        "$a: foo;\na {\n  co#{$a}lor: red;\n}\n",
-        "a {\n  cofoolor: red;\n}\n"
-    );
-    test!(
-        style_val_interpolation_start,
-        "a {\n  color: #{r}ed;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        style_val_interpolation_middle,
-        "a {\n  color: r#{e}d;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        style_val_interpolation_end,
-        "a {\n  color: re#{d};\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        style_val_interpolation_variable,
-        "$a: foo;\na {\n  color: r#{$a}ed;\n}\n",
-        "a {\n  color: rfooed;\n}\n"
-    );
-    test!(
-        style_whitespace,
-        "a {\n     color      :       red    ;    \n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        triple_nested_preceding_ruleset,
-        "a {\n  b {\n    foo: bar;\n    c {}\n  }\n}\n",
-        "a b {\n  foo: bar;\n}\n"
-    );
-    test!(
-        triple_nested_following_ruleset,
-        "a {\n  b {\n    c {}\n    foo: bar;\n  }\n}\n",
-        "a b {\n  foo: bar;\n}\n"
-    );
-    test!(
-        single_nested_styles,
-        "a {\n  webkit: {\n    color: red;\n    color: orange\n  }\n}\n",
-        "a {\n  webkit-color: red;\n  webkit-color: orange;\n}\n"
-    );
-    test!(
-        multiple_nested_styles,
-        "a {\n  webkit: {\n    webkit: {\n     color: red;\n    }\n  }\n}\n",
-        "a {\n  webkit-webkit-color: red;\n}\n"
-    );
-    test!(
-        no_space_between_colon,
-        "a {\n  color:red;\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-}
-
-mod test_misc {
-    use super::*;
-    // test!(
-    //     combines_hyphens,
-    //     "a {\n  foo: bar - baz;\n}\n",
-    //     "a {\n  foo: bar-baz;\n}\n"
-    // );
-    test!(does_not_combine_hyphens, "a {\n  foo: bar -baz;\n}\n");
-    test!(
-        ident_starts_with_hyphen,
-        "a {\n  foo: -webkit-bar-baz;\n}\n"
-    );
-    test!(ident_with_num, "el1 {\n  a: b;\n}\n");
-    test!(keyword_important, "a {\n  height: 1 !important;\n}\n");
-    test!(
-        keyword_important_uppercase,
-        "a {\n  height: 1 !IMPORTANT;\n}\n",
-        "a {\n  height: 1 !important;\n}\n"
-    );
-    test!(
-        keyword_important_not_at_end,
-        "a {\n  height: !important 1;\n}\n"
-    );
-    test!(
-        double_newline_between_unrelated_styles,
-        "a {\n  color: red;\n}\n\nb {\n  color: blue;\n}\n"
-    );
-}
-
-mod test_interpolation {
-    use super::*;
-    test!(
-        removes_double_quotes,
-        "a {\n  color: #{\"red\"};\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        removes_single_quotes,
-        "a {\n  color: #{'red'};\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-}
-
-mod test_mixins {
-    use super::*;
-    test!(
-        basic_mixin,
-        "@mixin a {\n  color: red;\n}\n\nb {\n  @include a;\n}\n",
-        "b {\n  color: red;\n}\n"
-    );
-    test!(empty_mixin, "@mixin a {}\n\nb {\n  @include a;\n}\n", "");
-    test!(
-        mixin_two_styles,
-        "@mixin a {\n  color: red;\n  color: blue;\n}\n\nb {\n  @include a;\n}\n",
-        "b {\n  color: red;\n  color: blue;\n}\n"
-    );
-    test!(
-        mixin_ruleset,
-        "@mixin a {\n  b {\n    color: red;\n  }\n}\nb {\n  @include a;\n}\n",
-        "b b {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_two_rulesets,
-        "@mixin a {\n  b {\n    color: red;\n  }\n  c {\n    color: blue;\n  }\n}\nd {\n  @include a;\n}\n",
-        "d b {\n  color: red;\n}\nd c {\n  color: blue;\n}\n"
-    );
-    test!(
-        mixin_ruleset_and_style,
-        "@mixin a {\n  b {\n    color: red;\n  }\n  color: blue;\n}\nd {\n  @include a;\n}\n",
-        "d {\n  color: blue;\n}\nd b {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_style_and_ruleset,
-        "@mixin a {\n  color: blue;\n  b {\n    color: red;\n}\n}\nd {\n  @include a;\n}\n",
-        "d {\n  color: blue;\n}\nd b {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_nested_rulesets,
-        "@mixin a {\n  b {\n    c {\n      color: red;\n}\n}\n}\nd {\n  @include a;\n}\n",
-        "d b c {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_removes_empty_ruleset,
-        "@mixin a {\n  color: red; b {\n}\n}\nd {\n  @include a;\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_variable_scope_one_ruleset,
-        "@mixin a {\n  $a: blue;\nb {\n  $a: red;\n}  color: $a\n}\nd {\n  @include a;\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_no_args,
-        "@mixin a {\n  color: red;\n}\nd {\n  @include a();\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_single_arg,
-        "@mixin a($b) {\n  color: $b;\n}\nd {\n  @include a(red);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_two_args,
-        "@mixin a($b, $c) {\n  color: $b;\n  color: $c\n}\nd {\n  @include a(red, blue);\n}\n",
-        "d {\n  color: red;\n  color: blue;\n}\n"
-    );
-    test!(
-        mixin_arg_trailing_comma,
-        "@mixin a($b, $c,) {\n  color: $b;\n  color: $c\n}\nd {\n  @include a(red, blue);\n}\n",
-        "d {\n  color: red;\n  color: blue;\n}\n"
-    );
-    test!(
-        mixin_property_interpolation,
-        "@mixin a($b) {\n  #{$b}: red;\n}\nd {\n  @include a(color);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_style_interpolation,
-        "@mixin a($b) {\n  color: #{$b};\n}\nd {\n  @include a(red);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_simple_default_value,
-        "@mixin a($b: red) {\n  color: $b;\n}\nd {\n  @include a;\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        mixin_second_value_default,
-        "@mixin a($a, $b: blue) {\n  color: $a $b;\n}\nd {\n  @include a(red);\n}\n",
-        "d {\n  color: red blue;\n}\n"
-    );
-    test!(
-        mixin_two_default_values,
-        "@mixin a($a: red, $b: blue) {\n  color: $a $b;\n}\nd {\n  @include a;\n}\n",
-        "d {\n  color: red blue;\n}\n"
-    );
-    test!(
-        mixin_override_default_value_positionally,
-        "@mixin a($a: red) {\n  color: $a;\n}\nd {\n  @include a(blue);\n}\n",
-        "d {\n  color: blue;\n}\n"
-    );
-    test!(
-        mixin_keyword_arg,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a: blue);\n}\n",
-        "d {\n  color: blue;\n}\n"
-    );
-    test!(
-        mixin_keyword_arg_override_default,
-        "@mixin a($a: red) {\n  color: $a;\n}\nd {\n  @include a($a: blue);\n}\n",
-        "d {\n  color: blue;\n}\n"
-    );
-    test!(
-        mixin_keyword_applies_to_second_arg,
-        "@mixin a($a: red, $b) {\n  color: $a $b;\n}\nd {\n  @include a($b: blue);\n}\n",
-        "d {\n  color: red blue;\n}\n"
-    );
-    test!(
-        mixin_two_keywords,
-        "@mixin a($a, $b) {\n  color: $a $b;\n}\nd {\n  @include a($a: red, $b: blue);\n}\n",
-        "d {\n  color: red blue;\n}\n"
-    );
-    test!(
-        mixin_two_keywords_wrong_direction,
-        "@mixin a($a, $b) {\n  color: $a $b;\n}\nd {\n  @include a($b: blue, $a: red);\n}\n",
-        "d {\n  color: red blue;\n}\n"
-    );
-    test!(
-        variable_in_call_args,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  $c: red;\n  @include a($c);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        comment_before_positional_call_arg,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a(/*foo*/red);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        comment_after_positional_call_arg,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a(red/*foo*/);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        comment_before_keyword_call_arg_val,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a: /*foo*/red);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        comment_after_keyword_call_arg_val,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a: red/*foo*/);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        comment_before_keyword_call_arg_name,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a(/*foo*/$a: red);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        comment_after_keyword_call_arg_name,
-        "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a/*foo*/: red);\n}\n",
-        "d {\n  color: red;\n}\n"
-    );
-    test!(
-        toplevel_include,
-        "@mixin a {\n  a {\n    color: red;\n  }\n}\n\n@include a;\n",
-        "a {\n  color: red;\n}\n"
-    );
-}
-
-mod test_imports {
-    use super::*;
-    use std::io::Write;
-    use tempfile::Builder;
-
-    macro_rules! test_import {
-        ($func:ident, $input:literal => $output:literal | $( $name:literal($content:literal) ),*) => {
-            #[test]
-            fn $func() {
-                $(
-                    let mut f = Builder::new().rand_bytes(0).prefix("").suffix($name).tempfile_in("").unwrap();
-                    write!(f, $content).unwrap();
-                )*
-                let mut buf = Vec::new();
-                StyleSheet::new($input)
-                .expect(concat!("failed to parse in "))
-                .print_as_css(&mut buf)
-                .expect(concat!("failed to pretty print on ", $input));
-                assert_eq!(
-                    String::from($output),
-                    String::from_utf8(buf).expect("produced invalid utf8")
-                );
-            }
-        }
-    }
-
-    // we have to use test name as filename because tests are run multithreaded in the same directory, so some names may conflict
-    test_import!(imports_variable, "@import \"imports_variable\";\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "imports_variable"("$a: red;"));
-    test_import!(single_quotes_import, "@import 'single_quotes_import';\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "single_quotes_import"("$a: red;"));
-    test_import!(finds_name_scss, "@import \"finds_name_scss\";\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "finds_name_scss.scss"("$a: red;"));
-    test_import!(finds_underscore_name_scss, "@import \"finds_underscore_name_scss\";\na {\n color: $a;\n}" => "a {\n  color: red;\n}\n" | "_finds_underscore_name_scss.scss"("$a: red;"));
-}
-
-mod test_values {
-    use super::*;
-    test!(comma_list_ident, "a {\n  color: red, white, blue;\n}\n");
-    test!(space_list_ident, "a {\n  color: red white blue;\n}\n");
-    test!(comma_list_number, "a {\n  color: 1, 2, 3;\n}\n");
-    test!(space_list_number, "a {\n  color: 1 2 3;\n}\n");
-    test!(comma_space_list_number, "a {\n  color: 1 1, 2 2, 3 3;\n}\n");
-    test!(preserves_keyword_true, "a {\n  color: true;\n}\n");
-    test!(preserves_keyword_false, "a {\n  color: false;\n}\n");
-    test!(preserves_keyword_null, "a {\n  color: null;\n}\n");
-    test!(preserves_keyword_auto, "a {\n  color: auto;\n}\n");
-    test!(preserves_keyword_initial, "a {\n  color: initial;\n}\n");
-    test!(preserves_keyword_infinity, "a {\n  color: infinity;\n}\n");
-    test!(preserves_keyword_not, "a {\n  color: not;\n}\n");
-    test!(preserves_keyword_and, "a {\n  color: and;\n}\n");
-    test!(preserves_keyword_or, "a {\n  color: or;\n}\n");
-    test!(preserves_keyword_unset, "a {\n  color: unset;\n}\n");
-    test!(preserves_keyword_nan, "a {\n  color: NaN;\n}\n");
-    test!(
-        preserves_quotes,
-        "a {\n  color: \"'red' \\\"blue\\\"\";\n}\n"
-    );
-    test!(
-        whitespace_space_list_number,
-        "a {\n  color:  1  2  3  ;\n}\n",
-        "a {\n  color: 1 2 3;\n}\n"
-    );
-    test!(
-        whitespace_comma_list_number,
-        "a {\n  color:  1 ,  2 ,  3  ;\n}\n",
-        "a {\n  color: 1, 2, 3;\n}\n"
-    );
-    test!(number, "a {\n  color: 1;\n}\n");
-    test!(
-        removes_paren_around_single_value,
-        "a {\n  color: (red);\n}\n",
-        "a {\n  color: red;\n}\n"
-    );
-    test!(
-        removes_paren_around_space_list,
-        "a {\n  color: (red blue);\n}\n",
-        "a {\n  color: red blue;\n}\n"
-    );
-    test!(
-        removes_paren_around_item_in_list,
-        "a {\n  color: 1 (red blue);\n}\n",
-        "a {\n  color: 1 red blue;\n}\n"
-    );
-}
-
-mod test_functions {
-    use super::*;
-    test!(
-        return_num,
-        "@function a() {\n  @return 1;\n}\n\nb {\ncolor: a();\n}\n",
-        "b {\n  color: 1;\n}\n"
-    );
-    test!(
-        return_spaced_list,
-        "@function a() {\n  @return a b;\n}\n\nb {\ncolor: a();\n}\n",
-        "b {\n  color: a b;\n}\n"
-    );
-    test!(
-        single_arg,
-        "@function a($c) {\n  @return $c;\n}\n\nb {\ncolor: a(1);\n}\n",
-        "b {\n  color: 1;\n}\n"
-    );
-    test!(
-        return_variable,
-        "@function a($a) {\n  @return $a;\n}\n\nb {\ncolor: a(1);\n}\n",
-        "b {\n  color: 1;\n}\n"
-    );
-    // test!(
-    //     return_no_semicolon,
-    //     "@function a() {\n  @return 1\n}\n\nb {\ncolor: a();\n}\n",
-    //     "b {\n  color: 1;\n}\n"
-    // );
-}
diff --git a/tests/misc.rs b/tests/misc.rs
new file mode 100644
index 0000000..7c80b86
--- /dev/null
+++ b/tests/misc.rs
@@ -0,0 +1,30 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+// test!(
+//     combines_hyphens,
+//     "a {\n  foo: bar - baz;\n}\n",
+//     "a {\n  foo: bar-baz;\n}\n"
+// );
+test!(does_not_combine_hyphens, "a {\n  foo: bar -baz;\n}\n");
+test!(
+    ident_starts_with_hyphen,
+    "a {\n  foo: -webkit-bar-baz;\n}\n"
+);
+test!(ident_with_num, "el1 {\n  a: b;\n}\n");
+test!(keyword_important, "a {\n  height: 1 !important;\n}\n");
+test!(
+    keyword_important_uppercase,
+    "a {\n  height: 1 !IMPORTANT;\n}\n",
+    "a {\n  height: 1 !important;\n}\n"
+);
+test!(
+    keyword_important_not_at_end,
+    "a {\n  height: !important 1;\n}\n"
+);
+test!(
+    double_newline_between_unrelated_styles,
+    "a {\n  color: red;\n}\n\nb {\n  color: blue;\n}\n"
+);
diff --git a/tests/mixins.rs b/tests/mixins.rs
new file mode 100644
index 0000000..47936fc
--- /dev/null
+++ b/tests/mixins.rs
@@ -0,0 +1,166 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    basic_mixin,
+    "@mixin a {\n  color: red;\n}\n\nb {\n  @include a;\n}\n",
+    "b {\n  color: red;\n}\n"
+);
+test!(empty_mixin, "@mixin a {}\n\nb {\n  @include a;\n}\n", "");
+test!(
+    mixin_two_styles,
+    "@mixin a {\n  color: red;\n  color: blue;\n}\n\nb {\n  @include a;\n}\n",
+    "b {\n  color: red;\n  color: blue;\n}\n"
+);
+test!(
+    mixin_ruleset,
+    "@mixin a {\n  b {\n    color: red;\n  }\n}\nb {\n  @include a;\n}\n",
+    "b b {\n  color: red;\n}\n"
+);
+test!(
+    mixin_two_rulesets,
+    "@mixin a {\n  b {\n    color: red;\n  }\n  c {\n    color: blue;\n  }\n}\nd {\n  @include a;\n}\n",
+    "d b {\n  color: red;\n}\nd c {\n  color: blue;\n}\n"
+);
+test!(
+    mixin_ruleset_and_style,
+    "@mixin a {\n  b {\n    color: red;\n  }\n  color: blue;\n}\nd {\n  @include a;\n}\n",
+    "d {\n  color: blue;\n}\nd b {\n  color: red;\n}\n"
+);
+test!(
+    mixin_style_and_ruleset,
+    "@mixin a {\n  color: blue;\n  b {\n    color: red;\n}\n}\nd {\n  @include a;\n}\n",
+    "d {\n  color: blue;\n}\nd b {\n  color: red;\n}\n"
+);
+test!(
+    mixin_nested_rulesets,
+    "@mixin a {\n  b {\n    c {\n      color: red;\n}\n}\n}\nd {\n  @include a;\n}\n",
+    "d b c {\n  color: red;\n}\n"
+);
+test!(
+    mixin_removes_empty_ruleset,
+    "@mixin a {\n  color: red; b {\n}\n}\nd {\n  @include a;\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    mixin_variable_scope_one_ruleset,
+    "@mixin a {\n  $a: blue;\nb {\n  $a: red;\n}  color: $a\n}\nd {\n  @include a;\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    mixin_no_args,
+    "@mixin a {\n  color: red;\n}\nd {\n  @include a();\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    mixin_single_arg,
+    "@mixin a($b) {\n  color: $b;\n}\nd {\n  @include a(red);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    mixin_two_args,
+    "@mixin a($b, $c) {\n  color: $b;\n  color: $c\n}\nd {\n  @include a(red, blue);\n}\n",
+    "d {\n  color: red;\n  color: blue;\n}\n"
+);
+test!(
+    mixin_arg_trailing_comma,
+    "@mixin a($b, $c,) {\n  color: $b;\n  color: $c\n}\nd {\n  @include a(red, blue);\n}\n",
+    "d {\n  color: red;\n  color: blue;\n}\n"
+);
+test!(
+    mixin_property_interpolation,
+    "@mixin a($b) {\n  #{$b}: red;\n}\nd {\n  @include a(color);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    mixin_style_interpolation,
+    "@mixin a($b) {\n  color: #{$b};\n}\nd {\n  @include a(red);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    mixin_simple_default_value,
+    "@mixin a($b: red) {\n  color: $b;\n}\nd {\n  @include a;\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    mixin_second_value_default,
+    "@mixin a($a, $b: blue) {\n  color: $a $b;\n}\nd {\n  @include a(red);\n}\n",
+    "d {\n  color: red blue;\n}\n"
+);
+test!(
+    mixin_two_default_values,
+    "@mixin a($a: red, $b: blue) {\n  color: $a $b;\n}\nd {\n  @include a;\n}\n",
+    "d {\n  color: red blue;\n}\n"
+);
+test!(
+    mixin_override_default_value_positionally,
+    "@mixin a($a: red) {\n  color: $a;\n}\nd {\n  @include a(blue);\n}\n",
+    "d {\n  color: blue;\n}\n"
+);
+test!(
+    mixin_keyword_arg,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a: blue);\n}\n",
+    "d {\n  color: blue;\n}\n"
+);
+test!(
+    mixin_keyword_arg_override_default,
+    "@mixin a($a: red) {\n  color: $a;\n}\nd {\n  @include a($a: blue);\n}\n",
+    "d {\n  color: blue;\n}\n"
+);
+test!(
+    mixin_keyword_applies_to_second_arg,
+    "@mixin a($a: red, $b) {\n  color: $a $b;\n}\nd {\n  @include a($b: blue);\n}\n",
+    "d {\n  color: red blue;\n}\n"
+);
+test!(
+    mixin_two_keywords,
+    "@mixin a($a, $b) {\n  color: $a $b;\n}\nd {\n  @include a($a: red, $b: blue);\n}\n",
+    "d {\n  color: red blue;\n}\n"
+);
+test!(
+    mixin_two_keywords_wrong_direction,
+    "@mixin a($a, $b) {\n  color: $a $b;\n}\nd {\n  @include a($b: blue, $a: red);\n}\n",
+    "d {\n  color: red blue;\n}\n"
+);
+test!(
+    variable_in_call_args,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  $c: red;\n  @include a($c);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    comment_before_positional_call_arg,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a(/*foo*/red);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    comment_after_positional_call_arg,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a(red/*foo*/);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    comment_before_keyword_call_arg_val,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a: /*foo*/red);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    comment_after_keyword_call_arg_val,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a: red/*foo*/);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    comment_before_keyword_call_arg_name,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a(/*foo*/$a: red);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    comment_after_keyword_call_arg_name,
+    "@mixin a($a) {\n  color: $a;\n}\nd {\n  @include a($a/*foo*/: red);\n}\n",
+    "d {\n  color: red;\n}\n"
+);
+test!(
+    toplevel_include,
+    "@mixin a {\n  a {\n    color: red;\n  }\n}\n\n@include a;\n",
+    "a {\n  color: red;\n}\n"
+);
diff --git a/tests/selectors.rs b/tests/selectors.rs
new file mode 100644
index 0000000..e174111
--- /dev/null
+++ b/tests/selectors.rs
@@ -0,0 +1,234 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    selector_nesting_el_mul_el,
+    "a, b {\n  a, b {\n  color: red\n}\n}\n",
+    "a a, a b, b a, b b {\n  color: red;\n}\n"
+);
+test!(selector_element, "a {\n  color: red;\n}\n");
+test!(selector_id, "#id {\n  color: red;\n}\n");
+test!(selector_class, ".class {\n  color: red;\n}\n");
+test!(selector_el_descendant, "a a {\n  color: red;\n}\n");
+test!(selector_universal, "* {\n  color: red;\n}\n");
+test!(selector_el_class_and, "a.class {\n  color: red;\n}\n");
+test!(selector_el_id_and, "a#class {\n  color: red;\n}\n");
+test!(
+    selector_el_class_descendant,
+    "a .class {\n  color: red;\n}\n"
+);
+test!(selector_el_id_descendant, "a #class {\n  color: red;\n}\n");
+test!(
+    selector_el_universal_descendant,
+    "a * {\n  color: red;\n}\n"
+);
+test!(
+    selector_universal_el_descendant,
+    "* a {\n  color: red;\n}\n"
+);
+
+test!(selector_attribute_any, "[attr] {\n  color: red;\n}\n");
+test!(
+    selector_attribute_any_lower_case_insensitive,
+    "[attr=val i] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_any_upper_case_insensitive,
+    "[attr=val I] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_arbitrary_modifier,
+    "[attr=val c] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_i_in_attr,
+    "[atitr=val] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_i_in_val,
+    "[attr=vail] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_whitespace,
+    "[attr   *=   val      ] {\n  color: red;\n}\n",
+    "[attr*=val] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_equals,
+    "[attr=val] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_single_quotes,
+    "[attr='val'] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_double_quotes,
+    "[attr=\"val\"] {\n  color: red;\n}\n"
+);
+test!(selector_attribute_in, "[attr~=val] {\n  color: red;\n}\n");
+test!(
+    selector_attribute_begins_hyphen_or_exact,
+    "[attr|=val] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_starts_with,
+    "[attr^=val] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_ends_with,
+    "[attr$=val] {\n  color: red;\n}\n"
+);
+test!(
+    selector_attribute_contains,
+    "[attr*=val] {\n  color: red;\n}\n"
+);
+test!(selector_el_attribute_and, "a[attr] {\n  color: red;\n}\n");
+test!(
+    selector_el_attribute_descendant,
+    "a [attr] {\n  color: red;\n}\n"
+);
+test!(selector_el_mul_el, "a, b {\n  color: red;\n}\n");
+test!(
+    selector_el_immediate_child_el,
+    "a > b {\n  color: red;\n}\n"
+);
+test!(selector_el_following_el, "a + b {\n  color: red;\n}\n");
+test!(selector_el_preceding_el, "a ~ b {\n  color: red;\n}\n");
+test!(selector_pseudo, ":pseudo {\n  color: red;\n}\n");
+test!(selector_el_and_pseudo, "a:pseudo {\n  color: red;\n}\n");
+test!(
+    selector_el_pseudo_descendant,
+    "a :pseudo {\n  color: red;\n}\n"
+);
+test!(
+    selector_pseudo_el_descendant,
+    ":pseudo a {\n  color: red;\n}\n"
+);
+test!(
+    selector_pseudo_paren_comma,
+    ":pseudo(a, b, c) {\n  color: red;\n}\n"
+);
+test!(
+    selector_pseudo_paren_space,
+    ":pseudo(a b c) {\n  color: red;\n}\n"
+);
+test!(
+    selector_el_pseudo_paren_and,
+    "a:pseudo(a, b, c) {\n  color: red;\n}\n"
+);
+test!(
+    selector_el_pseudo_paren_descendant,
+    "a :pseudo(a, b, c) {\n  color: red;\n}\n"
+);
+test!(
+    selector_pseudo_paren_el_descendant,
+    ":pseudo(a, b, c) a {\n  color: red;\n}\n"
+);
+test!(
+    selector_pseudo_paren_el_nested,
+    "a {\n  :pseudo(a, b, c) {\n  color: red;\n  }\n}\n",
+    "a :pseudo(a, b, c) {\n  color: red;\n}\n"
+);
+test!(selector_mul, "a, b {\n  color: red;\n}\n");
+test!(
+    outer_ampersand,
+    "a, b {\n& c {\n  color: red;\n}\n}\n",
+    "a c, b c {\n  color: red;\n}\n"
+);
+test!(
+    inner_ampersand,
+    "a, b {\na & c {\n  color: red;\n}\n}\n",
+    "a a c, a b c {\n  color: red;\n}\n"
+);
+test!(
+    ampersand_multiple_whitespace,
+    " a  ,  b   {\n&c {\n  color: red;\n}\n}\n",
+    "ac, bc {\n  color: red;\n}\n"
+);
+test!(
+    ampersand_alone,
+    "a, b {\n& {\n  color: red;\n}\n}\n",
+    "a, b {\n  color: red;\n}\n"
+);
+test!(
+    bem_dash_dash_selector,
+    "a {\n&--b {\n  color: red;\n}\n}\n",
+    "a--b {\n  color: red;\n}\n"
+);
+// test!(
+//     bem_underscore_selector,
+//     "a {\n&__b {\n  color: red;\n}\n}\n",
+//     "a__b {\n  color: red;\n}\n"
+// );
+test!(
+    selector_interpolation_start,
+    "#{a}bc {\n  color: red;\n}\n",
+    "abc {\n  color: red;\n}\n"
+);
+test!(
+    selector_interpolation_middle,
+    "a#{b}c {\n  color: red;\n}\n",
+    "abc {\n  color: red;\n}\n"
+);
+test!(
+    selector_interpolation_end,
+    "ab#{c} {\n  color: red;\n}\n",
+    "abc {\n  color: red;\n}\n"
+);
+test!(
+    selector_interpolation_variable,
+    "$a: foo;\nab#{$a} {\n  color: red;\n}\n",
+    "abfoo {\n  color: red;\n}\n"
+);
+test!(
+    selector_interpolation_super_selector,
+    "a {\nb #{&} { color: red; }}",
+    "a b a {\n  color: red;\n}\n"
+);
+test!(
+    selector_interpolation_super_selector_root_postfix,
+    "a#{&} {\nb { color: red; }}",
+    "a b {\n  color: red;\n}\n"
+);
+test!(
+    selector_interpolation_super_selector_root_prefix,
+    "#{&}a {\nb { color: red; }}",
+    "a b {\n  color: red;\n}\n"
+);
+test!(
+    selector_whitespace,
+    "  a  >  b  ,  c  ~  d  e  .f  #g  :h  i.j  [  k  ]  { color: red }",
+    "a > b, c ~ d e .f #g :h i.j [k] {\n  color: red;\n}\n"
+);
+test!(
+    comment_between_selectors,
+    "a /* foo */ b {\n  color: red;\n}\n",
+    "a b {\n  color: red;\n}\n"
+);
+test!(
+    interpolates_comma,
+    "$x: oo, ba;\nf#{$x}r {\n  baz {\n    color: red;\n  }\n}\n",
+    "foo baz, bar baz {\n  color: red;\n}\n"
+);
+test!(
+    extra_commas,
+    "div,, , span, ,, {\n  color: red;\n}\n",
+    "div, span {\n  color: red;\n}\n"
+);
+test!(
+    combinator_following,
+    "a + {\n  b {\n    color: red;\n  }\n}\n",
+    "a + b {\n  color: red;\n}\n"
+);
+test!(
+    combinator_preceding,
+    "a {\n  + b {\n    color: red;\n  }\n}\n",
+    "a + b {\n  color: red;\n}\n"
+);
+test!(
+    combinator_alone,
+    "a {\n  + {\n    b {\n      color: red;\n  }\n}\n",
+    "a + b {\n  color: red;\n}\n"
+);
diff --git a/tests/styles.rs b/tests/styles.rs
new file mode 100644
index 0000000..abae804
--- /dev/null
+++ b/tests/styles.rs
@@ -0,0 +1,127 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(basic_style, "a {\n  color: red;\n}\n");
+test!(two_styles, "a {\n  color: red;\n  color: blue;\n}\n");
+test!(
+    two_inner_rulesets,
+    "a {\n  b {\n  color: red;\n}\n  c {\n  color: white;\n}\n}\n",
+    "a b {\n  color: red;\n}\na c {\n  color: white;\n}\n"
+);
+test!(
+    two_rulesets,
+    "a {\n  color: red;\n}\n\nc {\n  color: white;\n}\n"
+);
+test!(
+    two_rulesets_first_no_semicolon,
+    "a {\n  color: red\n}\nc {\n  color: white;\n}\n",
+    "a {\n  color: red;\n}\n\nc {\n  color: white;\n}\n"
+);
+test!(
+    two_inner_outer_rulesets,
+    "a {\n  b {\n  color: red;\n}\n  c {\n  color: white;\n}\n}\na {\n  b {\n  color: red;\n}\n  c {\n  color: white;\n}\n}\n",
+    "a b {\n  color: red;\n}\na c {\n  color: white;\n}\n\na b {\n  color: red;\n}\na c {\n  color: white;\n}\n"
+);
+test!(
+    removes_empty_outer_styles,
+    "a {\n  b {\n    color: red;\n  }\n",
+    "a b {\n  color: red;\n}\n"
+);
+test!(removes_empty_styles, "a {}\n", "");
+test!(
+    doesnt_eat_style_after_ruleset,
+    "a {\n  b {\n  color: red;\n}\n  color: blue;\n}\n",
+    "a {\n  color: blue;\n}\na b {\n  color: red;\n}\n"
+);
+test!(
+    multiline_style,
+    "a {\n  color: red\n  blue;\n}\n",
+    "a {\n  color: red blue;\n}\n"
+);
+test!(hyphenated_style_property, "a {\n  font-family: Arial;\n}\n");
+test!(hyphenated_style_value, "a {\n  color: Open-Sans;\n}\n");
+test!(
+    space_separated_style_value,
+    "a {\n  border: solid red;\n}\n"
+);
+test!(single_quoted_style_value, "a {\n  font: 'Open-Sans';\n}\n");
+test!(
+    double_quoted_style_value,
+    "a {\n  font: \"Open-Sans\";\n}\n"
+);
+test!(
+    comma_style_value,
+    "a {\n  font: Open-Sans, sans-serif;\n}\n"
+);
+test!(
+    style_interpolation_start,
+    "a {\n  #{c}olor: red;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    style_interpolation_middle,
+    "a {\n  co#{l}or: red;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    style_interpolation_end,
+    "a {\n  colo#{r}: red;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    style_interpolation_variable,
+    "$a: foo;\na {\n  co#{$a}lor: red;\n}\n",
+    "a {\n  cofoolor: red;\n}\n"
+);
+test!(
+    style_val_interpolation_start,
+    "a {\n  color: #{r}ed;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    style_val_interpolation_middle,
+    "a {\n  color: r#{e}d;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    style_val_interpolation_end,
+    "a {\n  color: re#{d};\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    style_val_interpolation_variable,
+    "$a: foo;\na {\n  color: r#{$a}ed;\n}\n",
+    "a {\n  color: rfooed;\n}\n"
+);
+test!(
+    style_whitespace,
+    "a {\n     color      :       red    ;    \n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    triple_nested_preceding_ruleset,
+    "a {\n  b {\n    foo: bar;\n    c {}\n  }\n}\n",
+    "a b {\n  foo: bar;\n}\n"
+);
+test!(
+    triple_nested_following_ruleset,
+    "a {\n  b {\n    c {}\n    foo: bar;\n  }\n}\n",
+    "a b {\n  foo: bar;\n}\n"
+);
+test!(
+    single_nested_styles,
+    "a {\n  webkit: {\n    color: red;\n    color: orange\n  }\n}\n",
+    "a {\n  webkit-color: red;\n  webkit-color: orange;\n}\n"
+);
+test!(
+    multiple_nested_styles,
+    "a {\n  webkit: {\n    webkit: {\n     color: red;\n    }\n  }\n}\n",
+    "a {\n  webkit-webkit-color: red;\n}\n"
+);
+test!(
+    no_space_between_colon,
+    "a {\n  color:red;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
diff --git a/tests/units.rs b/tests/units.rs
new file mode 100644
index 0000000..5b70eea
--- /dev/null
+++ b/tests/units.rs
@@ -0,0 +1,11 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(unit_none, "a {\n  height: 1;\n}\n");
+test!(unit_not_attached, "a {\n  height: 1 px;\n}\n");
+test!(unit_px, "a {\n  height: 1px;\n}\n");
+test!(unit_em, "a {\n  height: 1em;\n}\n");
+test!(unit_rem, "a {\n  height: 1rem;\n}\n");
+test!(unit_percent, "a {\n  height: 1%;\n}\n");
diff --git a/tests/values.rs b/tests/values.rs
new file mode 100644
index 0000000..ae2800b
--- /dev/null
+++ b/tests/values.rs
@@ -0,0 +1,51 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(comma_list_ident, "a {\n  color: red, white, blue;\n}\n");
+test!(space_list_ident, "a {\n  color: red white blue;\n}\n");
+test!(comma_list_number, "a {\n  color: 1, 2, 3;\n}\n");
+test!(space_list_number, "a {\n  color: 1 2 3;\n}\n");
+test!(comma_space_list_number, "a {\n  color: 1 1, 2 2, 3 3;\n}\n");
+test!(preserves_keyword_true, "a {\n  color: true;\n}\n");
+test!(preserves_keyword_false, "a {\n  color: false;\n}\n");
+test!(preserves_keyword_null, "a {\n  color: null;\n}\n");
+test!(preserves_keyword_auto, "a {\n  color: auto;\n}\n");
+test!(preserves_keyword_initial, "a {\n  color: initial;\n}\n");
+test!(preserves_keyword_infinity, "a {\n  color: infinity;\n}\n");
+test!(preserves_keyword_not, "a {\n  color: not;\n}\n");
+test!(preserves_keyword_and, "a {\n  color: and;\n}\n");
+test!(preserves_keyword_or, "a {\n  color: or;\n}\n");
+test!(preserves_keyword_unset, "a {\n  color: unset;\n}\n");
+test!(preserves_keyword_nan, "a {\n  color: NaN;\n}\n");
+test!(
+    preserves_quotes,
+    "a {\n  color: \"'red' \\\"blue\\\"\";\n}\n"
+);
+test!(
+    whitespace_space_list_number,
+    "a {\n  color:  1  2  3  ;\n}\n",
+    "a {\n  color: 1 2 3;\n}\n"
+);
+test!(
+    whitespace_comma_list_number,
+    "a {\n  color:  1 ,  2 ,  3  ;\n}\n",
+    "a {\n  color: 1, 2, 3;\n}\n"
+);
+test!(number, "a {\n  color: 1;\n}\n");
+test!(
+    removes_paren_around_single_value,
+    "a {\n  color: (red);\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    removes_paren_around_space_list,
+    "a {\n  color: (red blue);\n}\n",
+    "a {\n  color: red blue;\n}\n"
+);
+test!(
+    removes_paren_around_item_in_list,
+    "a {\n  color: 1 (red blue);\n}\n",
+    "a {\n  color: 1 red blue;\n}\n"
+);
diff --git a/tests/variables.rs b/tests/variables.rs
new file mode 100644
index 0000000..dededf0
--- /dev/null
+++ b/tests/variables.rs
@@ -0,0 +1,100 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    basic_variable,
+    "$height: 1px;\na {\n  height: $height;\n}\n",
+    "a {\n  height: 1px;\n}\n"
+);
+test!(
+    variable_redeclaration,
+    "$a: 1px;\n$a: 2px;\na {\n  height: $a;\n}\n",
+    "a {\n  height: 2px;\n}\n"
+);
+test!(
+    variable_shadowing,
+    "$a: 1px;\n$b: $a;\na {\n  height: $b;\n}\n",
+    "a {\n  height: 1px;\n}\n"
+);
+test!(
+    variable_shadowing_val_does_not_change,
+    "$a: 1px;\n$b: $a; $a: 2px;\na {\n  height: $b;\n}\n",
+    "a {\n  height: 1px;\n}\n"
+);
+test!(
+    variable_shadowing_val_does_not_change_complex,
+    "a {\n  color: red;\n}\n$y: before;\n$x: 1 2 $y;\n$y: after;\nfoo {\n  a: $x;\n}",
+    "a {\n  color: red;\n}\n\nfoo {\n  a: 1 2 before;\n}\n"
+);
+test!(
+    variable_whitespace,
+    "$a   :    1px   ;\na {\n  height: $a;\n}\n",
+    "a {\n  height: 1px;\n}\n"
+);
+test!(
+    style_after_variable,
+    "$a: 1px;\na {\n  height: $a;\n  color: red;\n}\n",
+    "a {\n  height: 1px;\n  color: red;\n}\n"
+);
+test!(
+    literal_and_variable_as_val,
+    "$a: 1px;\na {\n  height: 1 $a;\n}\n",
+    "a {\n  height: 1 1px;\n}\n"
+);
+test!(
+    literal_and_variable_as_var,
+    "$a: 1px;\n$b: 1 $a;\na {\n  height: $b;\n}\n",
+    "a {\n  height: 1 1px;\n}\n"
+);
+test!(
+    eats_whitespace_after_variable_value,
+    "a {\n  b {\n    $c: red;\n  }\n  color: red;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    variable_changes_through_new_ruleset,
+    "a {\n  $c: red;\nb {\n    $c: blue;\n  }\n  color: $c;\n}\n",
+    "a {\n  color: blue;\n}\n"
+);
+test!(
+    nested_interpolation,
+    "$a: red; a {\n  color: #{#{$a}};\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    numbers_in_variable,
+    "$var1: red; a {\n  color: $var1;\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    default_var_after,
+    "$a: red;\n$a: blue !default;\na {\n  color: $a;\n}",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    default_var_before,
+    "$a: red !default;\n$a: blue;\na {\n  color: $a;\n}",
+    "a {\n  color: blue;\n}\n"
+);
+test!(
+    default_var_whitespace,
+    "$a: red     !default          ;\na {\n  color: $a;\n}",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    default_var_inside_rule,
+    "a {\n  $a: red;\n  $a: blue !default;\n  color: $a;\n}",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    interpolation_in_variable,
+    "$a: #{red};\na {\n  color: $a\n}\n",
+    "a {\n  color: red;\n}\n"
+);
+test!(
+    variable_decl_doesnt_end_in_semicolon,
+    "a {\n  $a: red\n}\n\nb {\n  color: blue;\n}\n",
+    "b {\n  color: blue;\n}\n"
+);