public function testPos() { $this->assertNull(StringHelper::pos(null, 'sad')); $this->assertNull(StringHelper::pos('a', 'sad', 10)); $this->assertEquals(1, StringHelper::pos('lakanahbaha', 'a')); $this->assertEquals(10, StringHelper::pos('lakanahbahakjlapaosa', 'a', 5)); $this->assertEquals(19, StringHelper::pos('lakanahbahakjlapaosa', 'a', -1)); $this->assertEquals(16, StringHelper::pos('lakanahbahakjlapaosa', 'a', -2)); }