Dataprovider and varargs

[sesh...@gmail.com]

I was trying to use dataprovider with varargs to my test.

I found below code when i googled it and that works well 

@DataProvider(name = "testData")

    public static Object[][] testDataProvider() {

        return new Object[][] {new String[]{"abc","abcd"},new String[]{"abc","abcd","123"}};

    }

    @Test(dataProvider = "testData")

    public void test(String... str) {

        System.out.println("\tThe Length is"+str.length);

    }

But ...my requirement is that my test case uses first two parameters and a variable length argument.

When i change above code to suit my needs below by adding two variable and varargs fro my test case:

@DataProvider(name = "testData")

    public static Object[][] testDataProvider() {

        return new Object[][] {new String[]{"abc","abcd"},new String[]{"abc","abcd","123"}};

    }

    @Test(dataProvider = "testData")

    public void test(String param1, String param2, String... str) {

        System.out.println("\tparam1 is"+param1+"\t param2 is: "+param2);

        for (String param : str)

            System.out.println("\t Other params are: : "+param);    

    }

It does not get executed, i get exception;  argument type mismatch

Suggest.

[⇜Krishnan Mahadevan⇝]

Maybe you can try wrapping your Vargs into your own class and then work with it.

Please see below for a sample :

public class VargsExample {

    @Test (dataProvider = "dp")
    public void testMethod(String arg1, String arg2, Vargs vargs) {
        System.err.println("Mandatory Arg1 " + arg1);
        System.err.println("Mandatory Arg2 " + arg2);
        System.err.println("Variable Arguments " + Arrays.toString(vargs.getArgs()));
    }

    @DataProvider (name = "dp")
    public Object[][] getData() {
        return new Object[][] {
            {"Selenium", "TestNG", new Vargs("Java", "Python")},
            {"Selenium", "TestNG", new Vargs("Hindi", "Tamil", "Telugu")},
            {"Selenium", "TestNG", new Vargs("Math", "Physics", "Chemistry", "Biology")}
        };
    }

    public static class Vargs {
        private String[] args;

        public Vargs(String... args) {
            this.args = args;
        }

        public String[] getArgs() {
            return args;
        }
    }
}

Output :

Mandatory Arg1 Selenium
Mandatory Arg2 TestNG
Variable Arguments [Java, Python]
Mandatory Arg1 Selenium
Mandatory Arg2 TestNG
Variable Arguments [Hindi, Tamil, Telugu]
Mandatory Arg1 Selenium
Mandatory Arg2 TestNG
Variable Arguments [Math, Physics, Chemistry, Biology]

Thanks & Regards
Krishnan Mahadevan

"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"
My Scribblings @ http://wakened-cognition.blogspot.com/

My Technical Scribbings @ http://rationaleemotions.wordpress.com/

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[Julien Herr]

Data providers with vargs are supposed to work: https://github.com/cbeust/testng/blob/master/src/test/java/test/dataprovider/VarArgsDataProviderTest.java

[⇜Krishnan Mahadevan⇝]

Julien,

No it doesn't work when a user mixes a set of fixed arguments and vargs.

The test that you shared makes use of ONLY vargs.

Thanks & Regards
Krishnan Mahadevan

"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"
My Scribblings @ http://wakened-cognition.blogspot.com/

My Technical Scribbings @ http://rationaleemotions.wordpress.com/

[Julien Herr]

Yes, true ! Will have to replace the varargs by an array (which is the same things in fact) and adapt the data provider.

public void test(String param1, String param2, String[] str) { ...

return new Object[][] { new Object[]{"abc","abcd", new String[]{}}, new Object[]{"abc","abcd", new String[]{"123"}};

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