@Test
public void testCountPlaceholders() {
WrongPlaceholderDetector detector = new WrongPlaceholderDetector(null);
assertThat(detector.countPlaceholder("")).isEqualTo(0);
assertThat(detector.countPlaceholder("{}")).isEqualTo(1);
assertThat(detector.countPlaceholder("Hello, world!")).isEqualTo(0);
assertThat(detector.countPlaceholder("{}, {}!")).isEqualTo(2);
assertThat(detector.countPlaceholder("\\{}")).isEqualTo(0);
}
