Java unit testing with parameter

Question

In C#, it is possible to specify parameters for the same unit test method. Example:

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

Is it possible to do the same in Java? I have read Parametrized runner but this solution is not as easy to use.

Answer 1

The Spock Framewok offers Data Driven Testing for Java and Groovy.

The Tests are ( unfortunately? ) written in Groovy:

 class MathSpec extends Specification { def "maximum of two numbers"() { expect: Math.max(a, b) == c where: a | b || c 1 | 3 || 3 7 | 4 || 7 0 | 0 || 0 } } 

Answer 2

With JUnit 5, parameterized tests are really more straight and natural to use as with JUnit 4.

In your case, to provide multiple parameters as input, you could use the @CsvSource annotation.

Here are the required dependencies (maven declaration way) :

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-engine</artifactId>
    <version>5.0.0-M4</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter-params</artifactId>
    <version>5.0.0-M4</version>
    <scope>test</scope>
</dependency>

And here is a sample code (with required imports) :

import org.junit.Assert;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;

public class YourTestClass{

    @ParameterizedTest
    @CsvSource({ "12,3,4", "12,2,6" })
    public void divideTest(int n, int d, int q) {
       Assert.assertEquals(q, n / d);
    }

}

Answer 3

You cannot achieve this so simple with JUnit out of the box, but you can use 3rd party JUnitParams :

@RunWith(JUnitParamsRunner.class)
public class PersonTest {

  @Test
  @Parameters({"17, false", 
               "22, true" })
  public void personIsAdult(int age, boolean valid) throws Exception {
    assertThat(new Person(age).isAdult(), is(valid));
  }

  @Test
  public void lookNoParams() {
    etc
  }
}

Answer 4

yes, eg. JUnit has parameterized tests

https://github.com/junit-team/junit4/wiki/parameterized-tests

The only drawback is that all test methods in the class will be executed for each parameter (row).