$this->assertSame("hello", "hello"); // Passes
$array1 = ["a", "b", "c"]; $array2 = ["a", "b", "c"]; $this->assertSame($array1, $array2); // FailsThe above code compares two arrays and expects them to be identical, which they are not. Although the values are the same, the two arrays are not identical since they are separate instances of the array object. The package library is PHPUnit.