Add workaround for regular CSS imports in SCSS

Fixes #7059

resources/resource_transformers/tocss/scss/client_test.go

@@ -0,0 +1,49 @@
+// Copyright 2020 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package scss
+
+import (
+	"testing"
+
+	qt "github.com/frankban/quicktest"
+)
+
+func TestReplaceRegularCSSImports(t *testing.T) {
+	c := qt.New(t)
+
+	scssWithImport := `
+	
+@import "moo";
+@import "regular.css";
+@import "moo";
+@import "another.css";
+
+/* foo */`
+
+	scssWithoutImport := `
+@import "moo";
+/* foo */`
+
+	res, replaced := replaceRegularImportsIn(scssWithImport)
+	c.Assert(replaced, qt.Equals, true)
+	c.Assert(res, qt.Equals, "\n\t\n@import \"moo\";\n/* HUGO_IMPORT_START regular.css HUGO_IMPORT_END */\n@import \"moo\";\n/* HUGO_IMPORT_START another.css HUGO_IMPORT_END */\n\n/* foo */")
+
+	res2, replaced2 := replaceRegularImportsIn(scssWithoutImport)
+	c.Assert(replaced2, qt.Equals, false)
+	c.Assert(res2, qt.Equals, scssWithoutImport)
+
+	reverted := replaceRegularImportsOut(res)
+	c.Assert(reverted, qt.Equals, scssWithImport)
+
+}