Java By Comparison

Describe Your Tests

class OxygenTankTest {
    static final double PERMILLE = 0.001;

    @Test
    @Disabled
    void testFill() {
        OxygenTank smallTank = OxygenTank.withCapacity(50);

        smallTank.fill(22);

        Assertions.assertEquals(0.44, smallTank.getStatus(), PERMILLE);
    }

    @Test
    private void testFill2() {
        OxygenTank bigTank = OxygenTank.withCapacity(10_000);
        bigTank.fill(5344.0);

        Executable when = () -> bigTank.fill(6000);

        Assertions.assertThrows(IllegalArgumentException.class, when);
    }
}

Eventually, tests will fail. That’s what they’re there for—telling you when you break something. When tests fail, the first thing you’ll see is their name. Good names are valuable—they help you find the cause for failure faster. ...