Extension\BuiltIn\StringMethodTest::testChangeCase PHP Method

    public function testChangeCase()
    {
        $t = new StringMethods();
        $this->assertSame('FOO', $t->getUpper('foo'));
        $this->assertSame('foo', $t->getLower('FOO'));
        $this->assertSame('Foo', $t->getUpperFirst('foo'));
        $this->assertSame('fOO', $t->getLowerFirst('FOO'));
    }