code: public <T extends Comparable<T>> void assertNotLessThan(Description description, T actual, T other) {
      assertNotNull(description, actual);
      if (isLessThan(actual, other)) {
        throw failures.failure(description, shouldNotBeLessThan(actual, other));
      }
    }
docs: Asserts that the <em>actual</em> value is greater than or equal to the other one.
  
  @param description the description of the <em>actual</em> value.
  @param actual the <em>actual</em> value.
  @param other the value to compare the actual value to.
  @throws AssertionError if the <em>actual</em> value is {@code null}.
  @throws AssertionError if the <em>actual</em> value is less than the other one.