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PHPUnit, SeleniumHQ, StoryPlayer, Codeception, SimpleTest, Behat, Cucumber, Atoum and Kahlan are some best testing tools for php.
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PHPUnit (Laravel comes with PHPUnit),
Atoum,
Behat,
Codeception,
Cucumber,
Kahlan,
SimpleTest,
SeleniumHQ,
StoryPlayer,
Mockery,
PHPSpec