Test.assertEquals(true, true, 'Should be true');

I'm getting a Syntax Error: Unexpected identifier error whenever I try to write a test to check my solutions in Javascript katas. I can't even get it to run when I put the exact same value for actual and expected.
I even get the syntax error with something like this:

var answer = true;
Test.assertEquals(answer, answer, [optional] message);

How should I write the test so that I can check my solutions?