Java JUnit Parameterized error

Question

I am creating a Java application based on JRE 6. I use JUnit 4 to generate parameterized tests. I am receiving this error:

The annotation @Parameterized.Parameters must define the attribute value

on the line containing the annotation:

@Parameterized.Parameters

Below is the code I believe to be relevant to this issue:

import static org.junit.Assert.assertEquals;

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

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

import calc.CalculatorException;
import calc.ScientificCalculator;

@RunWith(Parameterized.class)
public class ScientificCalculatorTest extends BasicCalculatorTest{

    /** Provides an interface to the scientific features of the calculator under test */
    private ScientificCalculator sciCalc;
    private double a, b;


    @Before
    @Override
    public void setUp() throws Exception {
        sciCalc = new ScientificCalculator();
        //Make sure that the basic functionality of the extended calculator
        //hasn't been broken.
        theCalc = sciCalc;
    }

    /**
     * Constructor. Is executed on each test and sets the test values to each pair in the data sets.
     * @param nr1 the first number in the tested pair.
     * @param nr2 the second number in the tested pair.
     */
    public ScientificCalculatorTest(double nr1, double nr2){
        a = nr1;
        b = nr2;
    }


    @Parameterized.Parameters
    public static Collection<Object[]> testGenerator() {
        return Arrays.asList(new Object[][] {
                //General integer values | -/+ combinations
                {  -100,  -100},
                {  -100,   100},
                {   100,  -100},
                {   100,   100}
        });
    }

I managed to find some far related questions, such as this. Sadly, in my situation they're of no help.

What I have tried and didn't work:

removing the "extends BasicCalculatorTest" from the class declaration
adding test functions that use the @Test annotation
importing org.junit.runners.Parameterized and using @Parameters instead of @Parameterized.Parameters

I need to mention that I have used a very similar implementation (most notably the annotations and testGenerator()) in another project without any issues. The implementation follows the tutorials available online, such as this, this and this.

Any help on solving this error is greatly appreciated.

@Parameterized.Parameters(value=/*required here*/) the error says the attribute value is mandatory. — Bhesh Gurung
– Bhesh Gurung, Commented Mar 4, 2013 at 23:31
@PaulBellora, it was just a typo, thanks for pointing it out, I have corrected it but the problem still remains. — Vlad Schnakovszki
– Vlad Schnakovszki, Commented Mar 4, 2013 at 23:32
@BheshGurung, I know it says that but I have used it in another project without (value=/*required here*/) and it worked just fine. Also, none of the tutorials I have linked use this. — Vlad Schnakovszki
– Vlad Schnakovszki, Commented Mar 4, 2013 at 23:34
@VladSchnakovszki I ask because I was able to get the exact same code, sans super class, to work on my machine. — user473395
– user473395, Commented Mar 5, 2013 at 17:40
Can you post a snapshot of what your projects has in the "Referenced Libraries" section? — Volker Stolz
– Volker Stolz, Commented Jun 4, 2013 at 8:17

Ray Tayek · Accepted Answer · 2013-03-05 17:30:53Z

1

try this:

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

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
public class So15213068 {
    public static class BaseTestCase {
        @Test public void test() {
            System.out.println("base class test");
        }
    }
    @RunWith(Parameterized.class) public static class TestCase extends BaseTestCase {
        public TestCase(Double nr1,Double nr2) {
            //super(nr1,nr2);
            this.nr1=nr1;
            this.nr2=nr2;
        }
        @Test public void test2() {
            System.out.println("subclass test "+nr1+" "+nr2);
        }
        @Parameters public static Collection<Object[]> testGenerator() {
            return Arrays.asList(new Object[][]{{-100.,-100.},{-100.,100.},{100.,-100.},{100.,100.}});
        }
        double nr1,nr2;
    }
}

output:

subclass test -100.0 -100.0
base class test
subclass test -100.0 100.0
base class test
subclass test 100.0 -100.0
base class test
subclass test 100.0 100.0
base class test

edited Mar 5, 2013 at 17:30

answered Mar 5, 2013 at 4:58

Ray Tayek

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6 Comments

Ray Tayek Over a year ago

this runs fine for me using jdk7 and eclipse on win 7 x64

Ray Tayek Over a year ago

i forgot to extend the base test case. i made that edit and added the output.

Vlad Schnakovszki Over a year ago

Thank you for your answer. Sadly, I gave a too short initial response to your solution. If I create a new project, add the JUnit4 libraries and add your code, it works perfectly. The problem is that if I add the code to the project in which I have encountered the problem, it shows the same error. I am thinking at this point that it is probably a wrong configuration in the project's properties. Any ideas from here?

Ray Tayek Over a year ago

maybe something funny in your old project. try creating a new project and moving everything or remove and add everything in the build path on the old project or move project to a new machine.

Mikkel Over a year ago

Maybe your old project has an old version of JUnit in its classpath?

|

nhahtdh · Accepted Answer · 2013-09-09 11:03:04Z

1

You miss the below import I think.

import org.junit.runners.Parameterized.Parameters;

edited Sep 9, 2013 at 11:03

nhahtdh

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answered Sep 9, 2013 at 9:48

Johne Altamera

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Comments

Ayub Malik · Accepted Answer · 2013-07-18 14:38:14Z

0

It must be because you extend BaseTestCase. I copied your code without extending from a base class the tests run correctly.

Try calling super.setUp() in your setup

E.g.

@Before
@Override
public void setUp() throws Exception {
    super.setUp();
    sciCalc = new ScientificCalculator();
    //Make sure that the basic functionality of the extended calculator
    //hasn't been broken.
    theCalc = sciCalc;
}

answered Jul 18, 2013 at 14:38

Ayub Malik

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Comments

velocity · Accepted Answer · 2019-11-18 12:20:50Z

-2

I had the same problem, i was extending my test from a test super class which has an init() method annotated with @org.junit.Before .
I implemented a test in the child class and run it, everything was fine so far.
Then i wanted to use a parameterized annotation to repeat the test for different values, so i used @ParameterizedTest with a @ValueSource and i run the test but it did not work because the initialization method in the supper class was not executed.
I overwritten the init() method in the child class and called super.init() but it did not work.
A solution that worked is to call super.init() at the start of the test in the child class.
I think this is a compatibility problem because everytime i mix JUnit4 and JUnit5 annotations in the same test class something wrong happens.

edited Nov 18, 2019 at 12:20

answered Nov 18, 2019 at 12:14

velocity

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