Testing

Ad Hoc Testing vs. JUnit

Ad Hoc Testing

public static void testSort() {
    String[] input = {"i", "have", "an", "egg"};
    String[] expected = {"an", "egg", "have", "i"};
 
    Sort.sort(input);
 
    for (int i = 0; i < input.length; i += 1) {
        if (!input[i].equals(expected[i])) {
            System.out.println("Mismatch in position " + i + ", expected: " + expected[i] + ", but got: " + input[i]);
        }
    }
}

JUnit: A Simpler Way

public static void testSort() {
    String[] input = {"i", "have", "an", "egg"};
    String[] expected = {"an", "egg", "have", "i"};
 
    Sort.sort(input);
 
	org.junit.Assert.assertArrayEquals(expected, input);
}

Simpler Junit Tests

1. Annotate each test with @org.junit.Test
   • So that these tests can be run independently.
   • Need to change all test methods to non-static.
2. import org.junit.Test and import static org.junit.Assert.*
   • Eliminate the need to type org. blah, blah.