Igorw\ComposeTest::testComposeWithSingleFunc PHP Method

    function testComposeWithSingleFunc()
    {
        $id = function ($x) {
            return $x;
        };
        $composed = compose($id);
        $this->assertNull($composed(null));
        $this->assertTrue($composed(true));
        $this->assertFalse($composed(false));
        $this->assertSame('foo', $composed('foo'));
    }