diff --git a/tests/addition.rs b/tests/addition.rs
new file mode 100644
index 0000000..da35676
--- /dev/null
+++ b/tests/addition.rs
@@ -0,0 +1,210 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    undefined_function_call_is_ident_adds,
+    "a {\n  color: 1 + foo();\n}\n",
+    "a {\n  color: 1foo();\n}\n"
+);
+test!(
+    unitless_plus_null,
+    "a {\n  color: 1 + null;\n}\n",
+    "a {\n  color: 1;\n}\n"
+);
+test!(
+    unitless_plus_null_plus_unitless,
+    "a {\n  color: 1 + null + 1;\n}\n",
+    "a {\n  color: 11;\n}\n"
+);
+test!(
+    unit_plus_null,
+    "a {\n  color: 1px + null;\n}\n",
+    "a {\n  color: 1px;\n}\n"
+);
+test!(
+    chain_ident_addition,
+    "a {\n  color: a + b + c + d + e + f;\n}\n",
+    "a {\n  color: abcdef;\n}\n"
+);
+test!(
+    removes_paren_around_space_list,
+    "a {\n  color: (foo bar);\n}\n",
+    "a {\n  color: foo bar;\n}\n"
+);
+test!(
+    removes_paren_around_item_in_list,
+    "a {\n  color: 1 (foo bar);\n}\n",
+    "a {\n  color: 1 foo bar;\n}\n"
+);
+test!(
+    adds_idents,
+    "a {\n  color: foo + bar;\n}\n",
+    "a {\n  color: foobar;\n}\n"
+);
+test!(
+    adds_dbl_quoted_idents,
+    "a {\n  color: \"foo\" + \"bar\";\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_sgl_quoted_idents,
+    "a {\n  color: 'foo' + 'bar';\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_dbl_and_un_quoted_idents,
+    "a {\n  color: \"foo\" + bar;\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_sgl_and_un_quoted_idents,
+    "a {\n  color: 'foo' + bar;\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_un_and_dbl_quoted_idents,
+    "a {\n  color: foo + \"bar\";\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_un_and_sgl_quoted_idents,
+    "a {\n  color: foo + 'bar';\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_sgl_and_dbl_quoted_idents,
+    "a {\n  color: 'foo' + \"bar\";\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_dbl_and_sgl_quoted_idents,
+    "a {\n  color: \"foo\" + 'bar';\n}\n",
+    "a {\n  color: \"foobar\";\n}\n"
+);
+test!(
+    adds_ident_true,
+    "a {\n  color: foo + true;\n}\n",
+    "a {\n  color: footrue;\n}\n"
+);
+test!(
+    adds_dbl_quoted_ident_true,
+    "a {\n  color: \"foo\" + true;\n}\n",
+    "a {\n  color: \"footrue\";\n}\n"
+);
+test!(
+    adds_ident_false,
+    "a {\n  color: foo + false;\n}\n",
+    "a {\n  color: foofalse;\n}\n"
+);
+test!(
+    adds_dbl_quoted_ident_false,
+    "a {\n  color: \"foo\" + false;\n}\n",
+    "a {\n  color: \"foofalse\";\n}\n"
+);
+test!(
+    adds_ident_important,
+    "a {\n  color: foo + !important;\n}\n",
+    "a {\n  color: foo!important;\n}\n"
+);
+test!(
+    adds_ident_null,
+    "a {\n  color: foo + null;\n}\n",
+    "a {\n  color: foo;\n}\n"
+);
+test!(
+    adds_dbl_quoted_ident_null,
+    "a {\n  color: \"foo\" + null;\n}\n",
+    "a {\n  color: \"foo\";\n}\n"
+);
+test!(
+    adds_sgl_quoted_ident_null,
+    "a {\n  color: 'foo' + null;\n}\n",
+    "a {\n  color: \"foo\";\n}\n"
+);
+test!(
+    adds_ident_number,
+    "a {\n  color: foo + 1;\n}\n",
+    "a {\n  color: foo1;\n}\n"
+);
+test!(
+    adds_dbl_quoted_ident_number,
+    "a {\n  color: \"foo\" + 1;\n}\n",
+    "a {\n  color: \"foo1\";\n}\n"
+);
+test!(
+    adds_sgl_quoted_ident_number,
+    "a {\n  color: 'foo' + 1;\n}\n",
+    "a {\n  color: \"foo1\";\n}\n"
+);
+test!(
+    adds_ident_dimension,
+    "a {\n  color: foo + 1px;\n}\n",
+    "a {\n  color: foo1px;\n}\n"
+);
+test!(
+    adds_dbl_quoted_ident_dimension,
+    "a {\n  color: \"foo\" + 1px;\n}\n",
+    "a {\n  color: \"foo1px\";\n}\n"
+);
+test!(
+    adds_sgl_quoted_ident_dimension,
+    "a {\n  color: 'foo' + 1px;\n}\n",
+    "a {\n  color: \"foo1px\";\n}\n"
+);
+test!(
+    adds_true_false,
+    "a {\n  color: true + false;\n}\n",
+    "a {\n  color: truefalse;\n}\n"
+);
+test!(
+    adds_false_null_is_string,
+    "a {\n  color: if(false+null, 1, 2);\n}\n",
+    "a {\n  color: 1;\n}\n"
+);
+test!(
+    adds_null_num_is_string,
+    "a {\n  color: null + 1;\n}\n",
+    "a {\n  color: 1;\n}\n"
+);
+test!(
+    num_plus_list,
+    "a {\n  color: 1 + (2 3);\n}\n",
+    "a {\n  color: 12 3;\n}\n"
+);
+test!(
+    list_plus_num,
+    "a {\n  color: (1 2) + 3;\n}\n",
+    "a {\n  color: 1 23;\n}\n"
+);
+test!(
+    dblquoted_plus_list,
+    "a {\n  color: \"1\" + (2 3);\n}\n",
+    "a {\n  color: \"12 3\";\n}\n"
+);
+test!(
+    list_plus_dblquoted,
+    "a {\n  color: (1 2) + \"3\";\n}\n",
+    "a {\n  color: \"1 23\";\n}\n"
+);
+test!(
+    sglquoted_plus_list,
+    "a {\n  color: 'a' + (b c);\n}\n",
+    "a {\n  color: \"ab c\";\n}\n"
+);
+test!(
+    list_plus_sglquoted,
+    "a {\n  color: (b c) + 'a';\n}\n",
+    "a {\n  color: \"b ca\";\n}\n"
+);
+test!(
+    list_plus_list,
+    "a {\n  color: (a b) + (1 2);\n}\n",
+    "a {\n  color: a b1 2;\n}\n"
+);
+test!(
+    multiple_ident_sum,
+    "a {\n  color: foo + 1 + bar + 2;\n}\n",
+    "a {\n  color: foo1bar2;\n}\n"
+);
diff --git a/tests/subtraction.rs b/tests/subtraction.rs
new file mode 100644
index 0000000..7b14e01
--- /dev/null
+++ b/tests/subtraction.rs
@@ -0,0 +1,155 @@
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    subs_idents,
+    "a {\n  color: foo - bar;\n}\n",
+    "a {\n  color: foo-bar;\n}\n"
+);
+test!(
+    subs_dbl_quoted_idents,
+    "a {\n  color: \"foo\" - \"bar\";\n}\n",
+    "a {\n  color: \"foo\"-\"bar\";\n}\n"
+);
+test!(
+    subs_sgl_quoted_idents,
+    "a {\n  color: 'foo' - 'bar';\n}\n",
+    "a {\n  color: \"foo\"-\"bar\";\n}\n"
+);
+test!(
+    subs_dbl_and_un_quoted_idents,
+    "a {\n  color: \"foo\" - bar;\n}\n",
+    "a {\n  color: \"foo\"-bar;\n}\n"
+);
+test!(
+    subs_sgl_and_un_quoted_idents,
+    "a {\n  color: 'foo' - bar;\n}\n",
+    "a {\n  color: \"foo\"-bar;\n}\n"
+);
+test!(
+    subs_un_and_dbl_quoted_idents,
+    "a {\n  color: foo - \"bar\";\n}\n",
+    "a {\n  color: foo-\"bar\";\n}\n"
+);
+test!(
+    subs_un_and_sgl_quoted_idents,
+    "a {\n  color: foo - 'bar';\n}\n",
+    "a {\n  color: foo-\"bar\";\n}\n"
+);
+test!(
+    subs_sgl_and_dbl_quoted_idents,
+    "a {\n  color: 'foo' - \"bar\";\n}\n",
+    "a {\n  color: \"foo\"-\"bar\";\n}\n"
+);
+test!(
+    subs_dbl_and_sgl_quoted_idents,
+    "a {\n  color: \"foo\" - 'bar';\n}\n",
+    "a {\n  color: \"foo\"-\"bar\";\n}\n"
+);
+test!(
+    subs_ident_true,
+    "a {\n  color: foo - true;\n}\n",
+    "a {\n  color: foo-true;\n}\n"
+);
+test!(
+    subs_dbl_quoted_ident_true,
+    "a {\n  color: \"foo\" - true;\n}\n",
+    "a {\n  color: \"foo\"-true;\n}\n"
+);
+test!(
+    subs_ident_false,
+    "a {\n  color: foo - false;\n}\n",
+    "a {\n  color: foo-false;\n}\n"
+);
+test!(
+    subs_dbl_quoted_ident_false,
+    "a {\n  color: \"foo\" - false;\n}\n",
+    "a {\n  color: \"foo\"-false;\n}\n"
+);
+test!(
+    subs_ident_important,
+    "a {\n  color: foo - !important;\n}\n",
+    "a {\n  color: foo-!important;\n}\n"
+);
+test!(
+    subs_ident_null,
+    "a {\n  color: foo - null;\n}\n",
+    "a {\n  color: foo-;\n}\n"
+);
+test!(
+    subs_dbl_quoted_ident_null,
+    "a {\n  color: \"foo\" - null;\n}\n",
+    "a {\n  color: \"foo\"-;\n}\n"
+);
+test!(
+    subs_sgl_quoted_ident_null,
+    "a {\n  color: 'foo' - null;\n}\n",
+    "a {\n  color: \"foo\"-;\n}\n"
+);
+test!(
+    subs_ident_number,
+    "a {\n  color: foo - 1;\n}\n",
+    "a {\n  color: foo-1;\n}\n"
+);
+test!(
+    subs_dbl_quoted_ident_number,
+    "a {\n  color: \"foo\" - 1;\n}\n",
+    "a {\n  color: \"foo\"-1;\n}\n"
+);
+test!(
+    subs_sgl_quoted_ident_number,
+    "a {\n  color: 'foo' - 1;\n}\n",
+    "a {\n  color: \"foo\"-1;\n}\n"
+);
+test!(
+    subs_ident_dimension,
+    "a {\n  color: foo - 1px;\n}\n",
+    "a {\n  color: foo-1px;\n}\n"
+);
+test!(
+    num_minus_list,
+    "a {\n  color: 1 - (2 3);\n}\n",
+    "a {\n  color: 1-2 3;\n}\n"
+);
+test!(
+    list_minus_num,
+    "a {\n  color: (1 2) - 3;\n}\n",
+    "a {\n  color: 1 2-3;\n}\n"
+);
+test!(
+    dblquoted_minus_list,
+    "a {\n  color: \"1\" - (2 3);\n}\n",
+    "a {\n  color: \"1\"-2 3;\n}\n"
+);
+test!(
+    list_minus_dblquoted,
+    "a {\n  color: (1 2) - \"3\";\n}\n",
+    "a {\n  color: 1 2-\"3\";\n}\n"
+);
+test!(
+    sglquoted_minus_list,
+    "a {\n  color: 'a' - (b c);\n}\n",
+    "a {\n  color: \"a\"-b c;\n}\n"
+);
+test!(
+    list_minus_sglquoted,
+    "a {\n  color: (b c) - 'a';\n}\n",
+    "a {\n  color: b c-\"a\";\n}\n"
+);
+test!(
+    list_minus_list,
+    "a {\n  color: (a b) - (1 2);\n}\n",
+    "a {\n  color: a b-1 2;\n}\n"
+);
+test!(
+    subs_dbl_quoted_ident_dimension,
+    "a {\n  color: \"foo\" - 1px;\n}\n",
+    "a {\n  color: \"foo\"-1px;\n}\n"
+);
+test!(
+    subs_sgl_quoted_ident_dimension,
+    "a {\n  color: 'foo' - 1px;\n}\n",
+    "a {\n  color: \"foo\"-1px;\n}\n"
+);
diff --git a/tests/values.rs b/tests/values.rs
index 9c0e330..7dc1ba1 100644
--- a/tests/values.rs
+++ b/tests/values.rs
@@ -52,256 +52,6 @@ test!(
     "a {\n  color: (foo);\n}\n",
     "a {\n  color: foo;\n}\n"
 );
-test!(
-    chain_ident_addition,
-    "a {\n  color: a + b + c + d + e + f;\n}\n",
-    "a {\n  color: abcdef;\n}\n"
-);
-test!(
-    removes_paren_around_space_list,
-    "a {\n  color: (foo bar);\n}\n",
-    "a {\n  color: foo bar;\n}\n"
-);
-test!(
-    removes_paren_around_item_in_list,
-    "a {\n  color: 1 (foo bar);\n}\n",
-    "a {\n  color: 1 foo bar;\n}\n"
-);
-test!(
-    adds_idents,
-    "a {\n  color: foo + bar;\n}\n",
-    "a {\n  color: foobar;\n}\n"
-);
-test!(
-    adds_dbl_quoted_idents,
-    "a {\n  color: \"foo\" + \"bar\";\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_sgl_quoted_idents,
-    "a {\n  color: 'foo' + 'bar';\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_dbl_and_un_quoted_idents,
-    "a {\n  color: \"foo\" + bar;\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_sgl_and_un_quoted_idents,
-    "a {\n  color: 'foo' + bar;\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_un_and_dbl_quoted_idents,
-    "a {\n  color: foo + \"bar\";\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_un_and_sgl_quoted_idents,
-    "a {\n  color: foo + 'bar';\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_sgl_and_dbl_quoted_idents,
-    "a {\n  color: 'foo' + \"bar\";\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_dbl_and_sgl_quoted_idents,
-    "a {\n  color: \"foo\" + 'bar';\n}\n",
-    "a {\n  color: \"foobar\";\n}\n"
-);
-test!(
-    adds_ident_true,
-    "a {\n  color: foo + true;\n}\n",
-    "a {\n  color: footrue;\n}\n"
-);
-test!(
-    adds_dbl_quoted_ident_true,
-    "a {\n  color: \"foo\" + true;\n}\n",
-    "a {\n  color: \"footrue\";\n}\n"
-);
-test!(
-    adds_ident_false,
-    "a {\n  color: foo + false;\n}\n",
-    "a {\n  color: foofalse;\n}\n"
-);
-test!(
-    adds_dbl_quoted_ident_false,
-    "a {\n  color: \"foo\" + false;\n}\n",
-    "a {\n  color: \"foofalse\";\n}\n"
-);
-test!(
-    adds_ident_important,
-    "a {\n  color: foo + !important;\n}\n",
-    "a {\n  color: foo!important;\n}\n"
-);
-test!(
-    adds_ident_null,
-    "a {\n  color: foo + null;\n}\n",
-    "a {\n  color: foo;\n}\n"
-);
-test!(
-    adds_dbl_quoted_ident_null,
-    "a {\n  color: \"foo\" + null;\n}\n",
-    "a {\n  color: \"foo\";\n}\n"
-);
-test!(
-    adds_sgl_quoted_ident_null,
-    "a {\n  color: 'foo' + null;\n}\n",
-    "a {\n  color: \"foo\";\n}\n"
-);
-test!(
-    adds_ident_number,
-    "a {\n  color: foo + 1;\n}\n",
-    "a {\n  color: foo1;\n}\n"
-);
-test!(
-    adds_dbl_quoted_ident_number,
-    "a {\n  color: \"foo\" + 1;\n}\n",
-    "a {\n  color: \"foo1\";\n}\n"
-);
-test!(
-    adds_sgl_quoted_ident_number,
-    "a {\n  color: 'foo' + 1;\n}\n",
-    "a {\n  color: \"foo1\";\n}\n"
-);
-test!(
-    adds_ident_dimension,
-    "a {\n  color: foo + 1px;\n}\n",
-    "a {\n  color: foo1px;\n}\n"
-);
-test!(
-    adds_dbl_quoted_ident_dimension,
-    "a {\n  color: \"foo\" + 1px;\n}\n",
-    "a {\n  color: \"foo1px\";\n}\n"
-);
-test!(
-    adds_sgl_quoted_ident_dimension,
-    "a {\n  color: 'foo' + 1px;\n}\n",
-    "a {\n  color: \"foo1px\";\n}\n"
-);
-test!(
-    adds_true_false,
-    "a {\n  color: true + false;\n}\n",
-    "a {\n  color: truefalse;\n}\n"
-);
-test!(
-    adds_false_null_is_string,
-    "a {\n  color: if(false+null, 1, 2);\n}\n",
-    "a {\n  color: 1;\n}\n"
-);
-test!(
-    adds_null_num_is_string,
-    "a {\n  color: null + 1;\n}\n",
-    "a {\n  color: 1;\n}\n"
-);
-test!(
-    subs_idents,
-    "a {\n  color: foo - bar;\n}\n",
-    "a {\n  color: foo-bar;\n}\n"
-);
-test!(
-    subs_dbl_quoted_idents,
-    "a {\n  color: \"foo\" - \"bar\";\n}\n",
-    "a {\n  color: \"foo\"-\"bar\";\n}\n"
-);
-test!(
-    subs_sgl_quoted_idents,
-    "a {\n  color: 'foo' - 'bar';\n}\n",
-    "a {\n  color: \"foo\"-\"bar\";\n}\n"
-);
-test!(
-    subs_dbl_and_un_quoted_idents,
-    "a {\n  color: \"foo\" - bar;\n}\n",
-    "a {\n  color: \"foo\"-bar;\n}\n"
-);
-test!(
-    subs_sgl_and_un_quoted_idents,
-    "a {\n  color: 'foo' - bar;\n}\n",
-    "a {\n  color: \"foo\"-bar;\n}\n"
-);
-test!(
-    subs_un_and_dbl_quoted_idents,
-    "a {\n  color: foo - \"bar\";\n}\n",
-    "a {\n  color: foo-\"bar\";\n}\n"
-);
-test!(
-    subs_un_and_sgl_quoted_idents,
-    "a {\n  color: foo - 'bar';\n}\n",
-    "a {\n  color: foo-\"bar\";\n}\n"
-);
-test!(
-    subs_sgl_and_dbl_quoted_idents,
-    "a {\n  color: 'foo' - \"bar\";\n}\n",
-    "a {\n  color: \"foo\"-\"bar\";\n}\n"
-);
-test!(
-    subs_dbl_and_sgl_quoted_idents,
-    "a {\n  color: \"foo\" - 'bar';\n}\n",
-    "a {\n  color: \"foo\"-\"bar\";\n}\n"
-);
-test!(
-    subs_ident_true,
-    "a {\n  color: foo - true;\n}\n",
-    "a {\n  color: foo-true;\n}\n"
-);
-test!(
-    subs_dbl_quoted_ident_true,
-    "a {\n  color: \"foo\" - true;\n}\n",
-    "a {\n  color: \"foo\"-true;\n}\n"
-);
-test!(
-    subs_ident_false,
-    "a {\n  color: foo - false;\n}\n",
-    "a {\n  color: foo-false;\n}\n"
-);
-test!(
-    subs_dbl_quoted_ident_false,
-    "a {\n  color: \"foo\" - false;\n}\n",
-    "a {\n  color: \"foo\"-false;\n}\n"
-);
-test!(
-    subs_ident_important,
-    "a {\n  color: foo - !important;\n}\n",
-    "a {\n  color: foo-!important;\n}\n"
-);
-test!(
-    subs_ident_null,
-    "a {\n  color: foo - null;\n}\n",
-    "a {\n  color: foo-;\n}\n"
-);
-test!(
-    subs_dbl_quoted_ident_null,
-    "a {\n  color: \"foo\" - null;\n}\n",
-    "a {\n  color: \"foo\"-;\n}\n"
-);
-test!(
-    subs_sgl_quoted_ident_null,
-    "a {\n  color: 'foo' - null;\n}\n",
-    "a {\n  color: \"foo\"-;\n}\n"
-);
-test!(
-    subs_ident_number,
-    "a {\n  color: foo - 1;\n}\n",
-    "a {\n  color: foo-1;\n}\n"
-);
-test!(
-    subs_dbl_quoted_ident_number,
-    "a {\n  color: \"foo\" - 1;\n}\n",
-    "a {\n  color: \"foo\"-1;\n}\n"
-);
-test!(
-    subs_sgl_quoted_ident_number,
-    "a {\n  color: 'foo' - 1;\n}\n",
-    "a {\n  color: \"foo\"-1;\n}\n"
-);
-test!(
-    subs_ident_dimension,
-    "a {\n  color: foo - 1px;\n}\n",
-    "a {\n  color: foo-1px;\n}\n"
-);
 test!(
     subs_dbl_quoted_ident_dimension,
     "a {\n  color: \"foo\" - 1px;\n}\n",
@@ -316,26 +66,6 @@ test!(
     undefined_function_call_is_ident,
     "a {\n  color: foo();\n}\n"
 );
-test!(
-    undefined_function_call_is_ident_adds,
-    "a {\n  color: 1 + foo();\n}\n",
-    "a {\n  color: 1foo();\n}\n"
-);
-test!(
-    unitless_plus_null,
-    "a {\n  color: 1 + null;\n}\n",
-    "a {\n  color: 1;\n}\n"
-);
-test!(
-    unitless_plus_null_plus_unitless,
-    "a {\n  color: 1 + null + 1;\n}\n",
-    "a {\n  color: 11;\n}\n"
-);
-test!(
-    unit_plus_null,
-    "a {\n  color: 1px + null;\n}\n",
-    "a {\n  color: 1px;\n}\n"
-);
 test!(hash_identifier_is_not_color, "a {\n  color: #foo;\n}\n");
 test!(
     hash_identifier_is_string,
@@ -382,87 +112,11 @@ test!(
     "a {\n  color: \"foo\" == 'foo';\n}\n",
     "a {\n  color: true;\n}\n"
 );
-test!(
-    multiple_ident_sum,
-    "a {\n  color: foo + 1 + bar + 2;\n}\n",
-    "a {\n  color: foo1bar2;\n}\n"
-);
 test!(
     many_parens,
     "a {\n  color: (((((red)))));\n}\n",
     "a {\n  color: red;\n}\n"
 );
-
-test!(
-    num_plus_list,
-    "a {\n  color: 1 + (2 3);\n}\n",
-    "a {\n  color: 12 3;\n}\n"
-);
-test!(
-    list_plus_num,
-    "a {\n  color: (1 2) + 3;\n}\n",
-    "a {\n  color: 1 23;\n}\n"
-);
-test!(
-    num_minus_list,
-    "a {\n  color: 1 - (2 3);\n}\n",
-    "a {\n  color: 1-2 3;\n}\n"
-);
-test!(
-    list_minus_num,
-    "a {\n  color: (1 2) - 3;\n}\n",
-    "a {\n  color: 1 2-3;\n}\n"
-);
-test!(
-    dblquoted_plus_list,
-    "a {\n  color: \"1\" + (2 3);\n}\n",
-    "a {\n  color: \"12 3\";\n}\n"
-);
-test!(
-    list_plus_dblquoted,
-    "a {\n  color: (1 2) + \"3\";\n}\n",
-    "a {\n  color: \"1 23\";\n}\n"
-);
-test!(
-    dblquoted_minus_list,
-    "a {\n  color: \"1\" - (2 3);\n}\n",
-    "a {\n  color: \"1\"-2 3;\n}\n"
-);
-test!(
-    list_minus_dblquoted,
-    "a {\n  color: (1 2) - \"3\";\n}\n",
-    "a {\n  color: 1 2-\"3\";\n}\n"
-);
-test!(
-    sglquoted_plus_list,
-    "a {\n  color: 'a' + (b c);\n}\n",
-    "a {\n  color: \"ab c\";\n}\n"
-);
-test!(
-    list_plus_sglquoted,
-    "a {\n  color: (b c) + 'a';\n}\n",
-    "a {\n  color: \"b ca\";\n}\n"
-);
-test!(
-    sglquoted_minus_list,
-    "a {\n  color: 'a' - (b c);\n}\n",
-    "a {\n  color: \"a\"-b c;\n}\n"
-);
-test!(
-    list_minus_sglquoted,
-    "a {\n  color: (b c) - 'a';\n}\n",
-    "a {\n  color: b c-\"a\";\n}\n"
-);
-test!(
-    list_plus_list,
-    "a {\n  color: (a b) + (1 2);\n}\n",
-    "a {\n  color: a b1 2;\n}\n"
-);
-test!(
-    list_minus_list,
-    "a {\n  color: (a b) - (1 2);\n}\n",
-    "a {\n  color: a b-1 2;\n}\n"
-);
 test!(
     negative_number_times_number,
     "a {\n  color: -1 * 2;\n}\n",