Code Inspection: 'assertTrue()' with incompatible argument type

Reports the PHPUnit assertTrue() calls whose arguments are of incompatible types. Since the assertTrue() method relies on strict types comparison with true, such assertions will always fail.

In the following example, the performAction() function returns a value of integer type, so the PHPUnit assertion will always fail. After the quick-fix is applied, the returned value is cast to boolean; as a result, the assertion will only fail in case 0 is returned and will pass otherwise. For more information about type conversions in PHP, refer to Type Casting (php.net).

                function performAction() : int {}

                class Test extends TestCase {
                    function doTest() {
                        $this->assertTrue(performAction());
                    }
                }
            

                function performAction() : int {}

                class Test extends TestCase {
                    function doTest() {
                        $this->assertTrue((bool)performAction());
                    }
                }
            

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Last modified: 11 February 2024