如何编写带有参数的单元测试？

Question

I am not familiar to java but in c#(NUnit) you can parameterize unit tests by adding [TestCase] attribute as following:

[TestCase(12,3,4)]
[TestCase(12,2,6)]
[TestCase(12,4,3)]
public void DivideTest(int n, int d, int q)
{
   Assert.AreEqual( q, n / d );
}

In this case we do not have to write seperate unit test for every test case. Instead we have writing [TestCase] to change the value.

Are there any equivelant on Java? Currently using Junit 4.12

Answer 1

Parameterized is what you need. Consider the below example. Note that test3 is obviously RED as 20/5 = 4.

import static org.junit.Assert.assertEquals;

import java.util.Arrays;
import java.util.Collection;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Parameterized.class)
public class DividerTest {

  private int dividend;
  private int divisor;
  private int expectedResult;

  @Parameterized.Parameters
  public static Collection<Object[]> data() {
    Object[] test1 = { 10, 5, 2 };
    Object[] test2 = { 15, 5, 3 };
    Object[] test3 = { 20, 5, 5 };

    return Arrays.asList(test1, test2, test3);
  }

  public DividerTest(int dividend, int divisor, int expectedResult) {
    this.dividend = dividend;
    this.divisor = divisor;
    this.expectedResult = expectedResult;
  }

  @Test
  public void testDivider() {
    assertEquals(expectedResult, dividend / divisor);
  }
}

And here are the test results:

Answer 2

TestNG是一个库和框架，可以使用数据工厂和依赖项注入对测试参数进行出色的控制。