Invoke Private / Protected Method

Sometimes you will need to invoke a private / protected method for testing. Apex offers a simple invokeMethod() within the testing library to facilitate this. For example:

public function testInvoke(): void

    $obj = new MyObject();
    $res = $this->invokeMethod($obj, 'myProtectedMethod', ['abc', '123']);
    $this->assertEquals($res, 'yes');


The above creates a new instance of MyObject(), calls the private / protected method of myProtectedMethod(), then returns the result.