Apply suggestions from code review

Author: eps1lon

test/utils/consoleErrorMock.js

@@ -38,7 +38,7 @@ class ConsoleErrorMock {
   args = () => {
     throw new TypeError(
       'args() was removed in favor of messages(). ' +
-        'Use messages to match against the actual error message that will be displayed in the console.',
+        'Use messages() to match against the actual error message that will be displayed in the console.',
     );
   };
 

test/utils/consoleErrorMock.test.js

@@ -14,7 +14,7 @@ describe('consoleErrorMock()', () => {
     it('was removed but throws a descriptive error', () => {
       assert.throws(
         () => consoleErrorMock.args(),
-        'args() was removed in favor of messages(). Use messages to match against the actual error message that will be displayed in the console.',
+        'args() was removed in favor of messages(). Use messages() to match against the actual error message that will be displayed in the console.',
       );
     });
   });