What is the “right” way to check the output of Java methods?

Question

In Python, I often have tests that look something like this:

tests = [
    (2, 4),
    (3, 9),
    (10, 100),
]
for (input, expected_output) in tests:
    assert f(input) == expected_output

What is the “correct” way to write such tests (where a set of test cases is given, then the loop starts each of them) in Java using JUnit?

Thanks!

Proactive response . I understand that I can do something like:

assertEquals(4, f(2))
assertEquals(9, f(3))
....

But ... I hope there is a better way.

Answer 1

Same.

    int[][] tests = {
            {2, 4},
            {3, 9},
            {10, 100}
    };
    for (int[] test : tests) {
        assertEquals(test[1], f(test[0]));
    }

Of course, not as beautiful as python, but little can be done.

You can also look at JUnit Theories , a future feature ...

Answer 2

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Answer 3

Junit.

http://junit.org/apidocs/org/junit/runners/Parameterized.html

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Answer 4

...

int[][] tests = new int[][]{
        {2, 4},
        {3, 9},
        {10, 100},
    };

for(int[] i : tests)
{
    assertEquals(i[1], f(i[0]);
}

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Answer 5

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Answer 6

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Answer 7

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