test for cases from rsass issues

tests/rsass_issues.rs

@@ -0,0 +1,28 @@
+//! Test cases adapted verbatim from the rsass issue tracker
+//! https://github.com/kaj/rsass/issues?q=is%3Aissue
+
+#![cfg(test)]
+
+#[macro_use]
+mod macros;
+
+test!(
+    /// https://github.com/kaj/rsass/issues/41
+    issue_41,
+    "@function str-replace($string, $search, $replace: \"\") {
+      $index: str-index($string, $search);
+    
+      @if $index {
+        @return str-slice($string, 1, $index - 1)+$replace+str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
+      }
+    
+      @return $index;
+    }
+    
+    $x: str-replace(url(\"a#b#c\"), \"#\", \":\");
+    
+    a {
+      color: $x;
+    }",
+    "a {\n  color: url(\"a:b:;\n}\n"
+);