src/main/java/org/fest/assertions/internal/CharArrays.java
public void assertIsSorted(Description description, char[] actual) {
    if(actual == null) {
      throw failures.failure("The actual is null");
    }
    if (actual.length == 0) {
      return;
    }
    for (int i = 0; i < actual.length - 1; i++) {
      if (actual[i] > actual[i + 1]) {
        throw failures.failure(description, shouldBeSorted(i, actual));
      }
    }
  }
public void assertIsSorted(Description description, char[] actual) {
    if(actual == null) {
      throw failures.failure("The actual is null");
    }
    if (actual.length == 0) {
      return;
    }
    for (int i = 0; i < actual.length - 1; i++) {
      if (actual[i] > actual[i + 1]) {
        throw failures.failure(description, shouldBeSorted(i, actual));
      }
    }
  }
Verifies that the actual is sorted into ascending order according to the natural ordering of its elements.
Empty arrays are considered sorted.

@param description contains the information about the assertion.
@param actual the given array.
@throws AssertionError if the {@code actual} is {@code null}.