phpunitHow to assert that key exists in an array using PHPUnit?

Asserting that a key exists in an array using PHPUnit can be done using the assertArrayHasKey() method. This method takes two parameters, the first being the array to check and the second being the key to check for.

$array = array('key1' => 'value1', 'key2' => 'value2');
$this->assertArrayHasKey('key1', $array);

The output of the above code will be a success if the key exists in the array, and a failure if it does not.

Code explanation

1. assertArrayHasKey() - The method used to assert that a key exists in an array.
2. $array - The array to check for the key.
3. 'key1' - The key to check for in the array.
4. $this - The object used to call the method.

Helpful links

• PHPUnit Documentation - assertArrayHasKey

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