public function testUppercaseFirst()
 {
     $s = new Stringizer("fizz");
     $this->assertEquals("Fizz", $s->uppercaseFirst());
     $s = new Stringizer("fizz buzz FOO bar");
     $this->assertEquals("Fizz buzz foo bar", $s->uppercaseFirst());
     $s = new Stringizer("ABCDEFG");
     $this->assertEquals("Abcdefg", $s->uppercaseFirst());
 }