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function testAdd() {
    $hash = new Hash;
...
    $hash->add("foo","bar");
    assert($OK == $hash->remove("foo"));
}

function testGetShouldNotDieHorriblyIfKeyNotFound() {
    $hash = new Hash;
...
    $hash->remove("foo");
    assert("bar" != $hash->get("foo"));  # hey look, still there
}