Java By Comparison

Cover the Edge Cases

class TransmissionParserTest {

    @Test
    void testValidTransmission() {
        TransmissionParser parser = new TransmissionParser();

        Transmission transmission = parser.parse("032Houston, UFO sighted!");

        Assertions.assertEquals(32, transmission.getId());
        Assertions.assertEquals("Houston, UFO sighted!",
                transmission.getContent());
    }
}

In a perfect world, you’d test your code for every possible input parameter. But most of the time, you simply can’t. Already, a simple 32-bit integer would require 2^32 tests. That’s over 4 billion! Instead of testing every possibility, you should cover the normal execution path and the settings that are most likely to go wrong. Put differently, you should cover edge cases. ...