phpmock\AbstractMockTest::testUndefinedFunction PHP Method

    public function testUndefinedFunction()
    {
        $this->assertFalse(function_exists("testUndefinedFunction"));
        $this->mockFunction(__NAMESPACE__, "testUndefinedFunction", function ($arg) {
            return $arg + 1;
        });
        $result = testUndefinedFunction(1);
        $this->assertEquals(2, $result);
    }