JUnit Parametrized Tests

Junit allows us to create parametrized tests. Parametrized test class has to be annotated with the @RunWith(Parameterized.class). The parametrized test class also meets below requirements:

  • It is annotated with @RunWith(Parameterized.class).
  • It has a single constructor that contains the test data.
  • It has a static method which annotated with @parameters annotation and generates and returns test data. Each test data is used as parameter for the test method.
  • It needs a test method that annotated with @test annotation.

Class Under Test: Addition.java


It is also possible to inject data values directly into fields without needing a constructor using the @Parameter annotation.




  • You learned how to write parametrized tests with constructor and without constructor.
  • You practiced with parametrized test examples.


JUnit, parametrized tests, unit testing, test framework



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About the Author:

Onur Baskirt
Onur Baskirt is a senior IT professional with 10+ years of experience. He worked at Bahçesehir University, ST Microelectronics, Huawei and Ericsson as research assistant, design verification engineer and software test leader. Also, he worked as software test leader and software operations manager at Turkey's biggest technology retailer, Teknosa. Now, he is working as Head of Software Testing and Manager of two Development Teams at Kariyer.net. His current research areas are technical software testing, programming, and computer science. Formerly, he has several research works and papers on digital chip design & verification. His hobbies are sport, dancing, traveling, and nutrition. You can find detailed information about him on his linked-in page.


  1. Mehmet Cetin December 16, 2015 at 12:25 pm - Reply

    The test condition,
    assertEquals(“Addition Failed!”, v1+v2, add.AddOperation(v1, v2));

    has the exact same behaviour of the function tested.

    If we are testing a function which sums two variables, we should give input values and the expected result. Like ~3, add.AddOperator(2, 1).
    Here the test is exactly performing the same operation with the function. If one fails the other will also and we will not detect a failure. We do not expect a wrong result from v1+v2 but theoretically we should avoid testing functions with a derivative logic of themselves, here logic is the same. I have seen many people used to do that but this is basically not testing the method especially when methods/functions are more complex.

  2. Onur Baskirt
    Onur Baskirt December 16, 2015 at 1:28 pm - Reply

    Hi Mehmet,

    I totally agree with you. I will fix the code. Thanks for the feedback.

  3. Onur Baskirt
    Onur Baskirt December 16, 2015 at 1:54 pm - Reply

    Code fixed. @Mehmet, thank you again.

  4. Ulvi September 18, 2016 at 10:35 pm - Reply

    Test King

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