18.7. Keeping Tests Atomic

18.7.1. Problem

When tests are lumped together, it’s possible to have tests that should pass but fail or tests that should fail but pass. This is a result of a test having invalid results because of side effects of a previous test:

test("2 asserts", function() {
    $("#main").append("<div>Click here for <span class='bold'>messages</span>.</div>");
    same($("#main div").length, 1, "added message link successfully");
    $("#main").append("<span>You have a message!</span>");
    same($("#main span").length, 1, "added notification successfully");
});