diff --git a/test/core/api.js b/test/core/api.js
index aafa0a337d..0afc77a516 100644
--- a/test/core/api.js
+++ b/test/core/api.js
@@ -70,7 +70,7 @@ suite("api", function () {
 
     assert.deepEqual(transform('import localName from "./array";', {
       resolveModuleSource: function() {
-        return 'override-source';
+        return "override-source";
       }
     }).metadata.modules.imports, [
       {
diff --git a/test/core/path.js b/test/core/path.js
index 46528b4231..c03f6eaeae 100644
--- a/test/core/path.js
+++ b/test/core/path.js
@@ -12,7 +12,7 @@ suite("traversal path", function () {
       plugins: [new Plugin("foobar", {
         visitor: {
           FunctionDeclaration: function () {
-            return "console.whatever()";
+            this.replaceWithSourceString("console.whatever()");
           }
         }
       })]