public function testKelvin() { $Temp = new Temperature(300, Temperature::KELVIN); $this->assertEquals(300, $Temp->value()); $this->assertEquals('K', $Temp->unit()); $this->assertEquals('300 K', $Temp->asString()); $this->assertFalse($Temp->isUnknown()); $Temp->toCelsius(); $this->assertEquals('27 °C', $Temp->asString()); $Temp->setTemperature(7); $Temp->toKelvin(); $this->assertEquals(280.15, $Temp->value()); }