TestNG: Access data provider defined in other class

By specifying 'dataProviderClass', you can access the data providers defined in other class.

Example

@Test(dataProvider = "inputCombinations", dataProviderClass = CustomDataProvider.class)
public void addTest(int a, int b) {
        int result = calculator.add(a, b);
        System.out.println("Sum of a and b is : " + result);

        assertEquals(result, sum(a, b));
}

Find the below working application.

Calculator.java

package com.sample.app.arithmetic;

public class Calculator {
        public int add(int a, int b) {
                return a + b;
        }

        public int subtract(int a, int b) {
                return a - b;
        }

        public int mul(int a, int b) {
                return a * b;
        }

        public int div(int a, int b) {
                return a / b;
        }

        public int remainder(int a, int b) {
                return a % b;
        }

        public boolean isEven(int number) {
                return number % 2 == 0;
        }

        public boolean isOdd(int number) {
                return number % 2 != 0;
        }
}

CustomDataProvider.java

package com.sample.app.tests;

import org.testng.annotations.DataProvider;

public class CustomDataProvider {
        @DataProvider(name = "inputCombinations")
        private Object[][] input() {
                return new Object[][] { { 0, 0 }, { -1, -2 }, { 1, -2 }, { -2, 1 }, { 1, 2 } };
        }
}

DataProviderDemo1.java

package com.sample.app.tests;

import static org.testng.Assert.assertEquals;

import org.testng.annotations.Test;

import com.sample.app.arithmetic.Calculator;

public class DataProviderDemo1 {

        private Calculator calculator = new Calculator();

        @Test(dataProvider = "inputCombinations", dataProviderClass = CustomDataProvider.class)
        public void addTest(int a, int b) {
                int result = calculator.add(a, b);
                System.out.println("Sum of a and b is : " + result);

                assertEquals(result, sum(a, b));
        }

        private static int sum(int a, int b) {
                return a + b;
        }
}

Run DataProviderDemo1.java, you will see below messages in console.

[RemoteTestNG] detected TestNG version 7.0.0
Sum of a and b is : 0
Sum of a and b is : -3
Sum of a and b is : -1
Sum of a and b is : -1
Sum of a and b is : 3
PASSED: addTest(0, 0)
PASSED: addTest(-1, -2)
PASSED: addTest(1, -2)
PASSED: addTest(-2, 1)
PASSED: addTest(1, 2)

===============================================
    Default test
    Tests run: 5, Failures: 0, Skips: 0
===============================================


===============================================
Default suite
Total tests run: 5, Passes: 5, Failures: 0, Skips: 0
===============================================

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