phpunitHow to use a data provider in PHPUnit?

Data providers are a powerful feature of PHPUnit that allow you to pass multiple sets of data to a test method.

<?php

class DataProviderTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @dataProvider additionProvider
     */
    public function testAdd($a, $b, $expected)
    {
        $this->assertSame($expected, $a + $b);
    }

    public function additionProvider()
    {
        return [
            'adding zeros'  => [0, 0, 0],
            'zero plus one' => [0, 1, 1],
            'one plus zero' => [1, 0, 1],
            'one plus one'  => [1, 1, 2]
        ];
    }
}

The output of the example code is:

OK (4 tests, 4 assertions)

Code explanation

1. @dataProvider additionProvider - This annotation tells PHPUnit to use the additionProvider method as a data provider for the test method.
2. public function additionProvider() - This method returns an array of data sets to be used in the test method.
3. $this->assertSame($expected, $a + $b); - This assertion checks that the expected result matches the actual result of the addition.

Helpful links

• PHPUnit Data Providers

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