The first one is your wrong answer, not the input value. To see the input, print it. Or just see the sample test.

var str = "How can mirrors be real if our eyes aren't real";
Test.assertEquals(str.toJadenCase(), "How Can Mirrors Be Real If Our Eyes Aren't Real");

It says "eyes" there, doesn't it?

No, and please read the posts below or provide some proof when you say something is broken:

JavaScript Completions 60647

Your code is wrong.