Add regression test for sass/dart-sass#2208

lib/sassc/embedded.rb

@@ -315,11 +315,6 @@ def canonicalize(url, context)
             canonical_url = resolve_file_url(path, parent_path, context.from_import)
             return unless canonical_url
 
-            # Temporarily disable FileImporter optimization
-            # https://github.com/sass/dart-sass/issues/2208
-            #
-            # @canonical_urls[url] = canonical_url
-            # return nil
             @canonical_urls[url] = canonical_url
             return
           end

test/custom_importer_test.rb

@@ -37,6 +37,16 @@ def imports(_path, parent_path)
       end
     end
 
+    class ParentDirImporter < Importer
+      def imports(path, parent_path)
+        if (path).include?('path')
+          Import.new('path.scss', source: "a { from: #{File.basename(File.dirname(parent_path))}; }")
+        else
+          Import.new(path)
+        end
+      end
+    end
+
     def test_custom_importer_works
       temp_file('styles2.scss', '.hi { color: $var1; }')
       temp_file('fonts.scss', '.font { color: $var1; }')
@@ -87,6 +97,33 @@ def test_custom_importer_works_for_file_in_parent_dir
       CSS
     end
 
+    # regression test for https://github.com/sass/dart-sass/issues/2208
+    def test_custom_importer_works_for_imports_with_same_name
+      temp_dir('sub1')
+      temp_dir('sub1/sub2')
+      temp_file('sub1/test.scss', '@import "path";')
+      temp_file('sub1/sub2/test.scss', '@import "path";')
+
+      data = <<~SCSS
+         @import "sub1/test";
+         @import "sub1/sub2/test";
+      SCSS
+
+      engine = Engine.new(data, {
+        importer: ParentDirImporter
+      })
+
+      assert_equal <<~CSS, engine.render
+         a {
+           from: sub1;
+         }
+
+         a {
+           from: sub2;
+         }
+      CSS
+    end
+
     def test_dependency_list
       base = Dir.pwd