borysfan / cactoos-matchers Goto Github PK

@Test
public void textHasPrefix() {
  final String prefix = "Application startup";
  new Assertion<>(
    "must have the prefix",
    () -> new TextOf(new File("some.log")),
    new StartsWith(prefix)
  ).affirm();
}  

@Test
public void csvLineHasCorrectFormat() throws Exception {
  final String fields = "^[^|]+|[^|]+|[^|]+$";
  new Assertion<>(
    "must match the expected pattern",
    () -> new FirstOf<>(
      line -> true,
      new SplitText(
        new TextOf(new File("report.csv")),
        "\n"
      )
    ).value(),
    new MatchesRegex(fields)
  ).affirm();
}

@Test
public void textIsBlank() {
  new Assertion<>(
    "must be blank",
    () -> new TextOf(new File("records.txt")),
    new IsBlank()
  ).affirm();
}

/**
 * Want some assurance that your object is thread-safe?
 */
@Test
public void threadSafety() {
  new Assertion<>(
    "must be able to modify the map concurrently",
    () -> map -> {
      boolean success = true;
      try {
        map.forEach(
          (key, value) -> {
            map.remove(key);
            final Random r = new Random();
            map.put(r.nextInt(), r.nextInt());
          }
        );
      } catch (ConcurrentModificationException ex) {
        success = false;
      }
      return success;
    },
    new RunsInThreads<>(new ConcurrentHashMap<>(), 100)
  ).affirm();
}

@Test
public void throwIllegalArgumentExceptionIfLessThan10() throws Exception {
  final Func<Integer, Integer> test = input -> {
    if (input < 10) {
      throw new IllegalArgumentException();
    }
    return input * 10;
  };
  new Assertion<>(
    "must throw illegalargumentexception if input is less than 10",
    () -> test.apply(5),
    new Throws(IllegalArgumentException.class)
  ).affirm();
}

@Test
public void matchExactString() {
  new Assertion<>(
    "must match the exact text",
    () -> new TextIs("abc"),          // matcher being tested
    new Matches<>(new TextOf("abc"))  // reference against which the matcher is tested
  ).affirm();
}