src/main/java/org/fest/assertions/CharAssert.java
public @NotNull CharAssert isLowerCase() {
    if (Character.isLowerCase(actual)) {
      return this;
    }
    failIfCustomMessageIsSet();
    throw failure(String.format("<%s> should be a lower-case character", actual));
  }
public @NotNull CharAssert isLowerCase() {
    if (Character.isLowerCase(actual)) {
      return this;
    }
    failIfCustomMessageIsSet();
    throw failure(String.format("<%s> should be a lower-case character", actual));
  }
Verifies that the {@code Character} value is an lower-case value.

@return this assertion object.
@throws AssertionError if the {@code Character} value is not an lower-case value.