refactor: use snapshots for some tests (#805)

Author: evilebottnawi

lib/postcss-css-loader-parser.js

@@ -6,7 +6,7 @@ const loaderUtils = require('loader-utils');
 
 module.exports = postcss.plugin(
   'postcss-css-loader-parser',
-  (options) => (css) => {
+  (options) => (css, result) => {
     const imports = {};
     let exports = {};
     const importItems = [];
@@ -32,18 +32,42 @@ module.exports = postcss.plugin(
     }
 
     if (options.import) {
-      css.walkAtRules(/^import$/i, (rule) => {
-        const values = Tokenizer.parseValues(rule.params);
+      css.walkAtRules(/^import$/i, (atrule) => {
+        // Convert only top-level @import
+        if (atrule.parent.type !== 'root') {
+          return;
+        }
+
+        if (atrule.nodes) {
+          result.warn(
+            "It looks like you didn't end your @import statement correctly. " +
+              'Child nodes are attached to it.',
+            { node: atrule }
+          );
+          return;
+        }
+
+        const values = Tokenizer.parseValues(atrule.params);
         let [url] = values.nodes[0].nodes;
+
         if (url && url.type === 'url') {
           ({ url } = url);
         } else if (url && url.type === 'string') {
           url = url.value;
-        } else throw rule.error(`Unexpected format ${rule.params}`);
+        } else {
+          result.warn(`Unable to find uri in '${atrule.toString()}'`, {
+            node: atrule,
+          });
+
+          return;
+        }
+
         if (!url.replace(/\s/g, '').length) {
           return;
         }
+
         values.nodes[0].nodes.shift();
+
         const mediaQuery = Tokenizer.stringifyValues(values);
 
         if (loaderUtils.isUrlRequest(url)) {
@@ -54,7 +78,7 @@ module.exports = postcss.plugin(
           url,
           mediaQuery,
         });
-        rule.remove();
+        atrule.remove();
       });
     }