public function testConvertWeight() { $this->assertEquals(\Isotope\Isotope::convertWeight(2, 'kg', 'g'), 2000); $this->assertEquals(\Isotope\Isotope::convertWeight(2, 'g', 'mg'), 2000); $this->assertEquals(\Isotope\Isotope::convertWeight(2, 'kg', 'mg'), 2000000); }