MathPHP\Statistics\CorrelationTest::testPopulationCovarianceExceptionWhenXAndYHaveDifferentCounts PHP Method

    public function testPopulationCovarianceExceptionWhenXAndYHaveDifferentCounts()
    {
        $this->setExpectedException('MathPHP\\Exception\\BadDataException');
        Correlation::populationCovariance([1, 2], [2, 3, 4]);
    }