added an explicit test of media-query syntax

Author: geelen

test/test-cases/export-class/expected.css

@@ -1,5 +1,6 @@
 :export {
   exportName: _input__exportName;
+  newExport: _input__newExport;
 }
 
 ._input__exportName {
@@ -9,3 +10,14 @@
 ._input__exportName:hover {
   color: red;
 }
+
+@media (max-width: 520px) {
+  /* selector doubled to increase specificity */
+  ._input__exportName._input__exportName {
+    color: darkgreen;
+  }
+
+  ._input__newExport {
+    color: blue;
+  }
+}

test/test-cases/export-class/source.css

@@ -5,3 +5,14 @@
 :local(.exportName):hover {
   color: red;
 }
+
+@media (max-width: 520px) {
+  /* selector doubled to increase specificity */
+  :local(.exportName):local(.exportName) {
+    color: darkgreen;
+  }
+
+  :local(.newExport) {
+    color: blue;
+  }
+}