Test your tests!
A last thought before we close this chapter: not enough time and thought is given to the idea of testing the tests themselves. One should not hurry in adding a new test to the suite without running it at least a dozen times. Personally, I tend to run each new test about 20 times before I consider it stable. Just put the tests in a loop, let it run for 20 minutes while you get a cup of coffee. You will be surprised how often a test will fail if you just let it run enough times.
Finally, don't forget to test your tests on multiple browsers. As a rule of the thumb, any test you will write will be a lot more stable in Firefox and Chrome browsers than they are in Internet Explorer and Safari. Just because you got stability in the test ...
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