MathPHP\Probability\Distribution\Continuous\WeibullTest::testCDF PHP Method

    public function testCDF($x, $k, $λ, $cdf)
    {
        $p = Weibull::CDF($x, $k, $λ);
        $this->assertEquals($cdf, $p, '', 0.001);
        if ($x >= 0) {
            $this->assertEquals($x, Weibull::inverse($p, $k, $λ), '', 0.001);
        }
    }