GitHub447Sample.java

package test.reports;

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import java.util.ArrayList;
import java.util.List;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;

public class GitHub447Sample {

    @Test(dataProvider = "add")
    public void add(List<Object> list, Object e, String expected) {
        assertTrue(list.add(e));
        assertEquals(list.toString(), expected);
    }
    @DataProvider(name = "add")
    protected static final Object[][] addTestData() {
        List<Object> list = new ArrayList<>(5);

        Object[][] testData = new Object[][] {
                { list, null, "[null]" },
                { list, "dup", "[null, dup]" },
                { list, "dup", "[null, dup, dup]" },
                { list, "str", "[null, dup, dup, str]" },
                { list, null, "[null, dup, dup, str, null]" },
        };
        return testData;
    }
}