diff --git a/tests/mocha/registry_test.js b/tests/mocha/registry_test.js
index 44c941a29..f4171197c 100644
--- a/tests/mocha/registry_test.js
+++ b/tests/mocha/registry_test.js
@@ -84,8 +84,13 @@ suite('Registry', function() {
     });
     test('Incorrect Plugin Name', function() {
       this.options['plugins']['test'] = 'random';
-      var testClass = Blockly.registry.getClassFromOptions('test', this.options);
+      var testClass;
+      var warnings = captureWarnings(() => {
+        testClass = Blockly.registry.getClassFromOptions('test', this.options);
+      });
       chai.assert.isNull(testClass);
+      chai.assert.equal(warnings.length, 1,
+          'Expecting 1 warning about no name "random" found.');
     });
   });
 });