src/main/java/org/fest/assertions/ComparableAssert.java
public final @NotNull S isGreaterThanOrEqualTo(@Nullable T other) {
    isNotNull();
    if (actual.compareTo(other) >= 0) {
      return myself();
    }
    failIfCustomMessageIsSet();
    throw failure(unexpectedLessThan(actual, other));
  }
public final @NotNull S isGreaterThanOrEqualTo(@Nullable T other) {
    isNotNull();
    if (actual.compareTo(other) >= 0) {
      return myself();
    }
    failIfCustomMessageIsSet();
    throw failure(unexpectedLessThan(actual, other));
  }
Verifies that the actual {@link Comparable} is greater than or equal to the given one.

@param other the given value.
@return this assertion object.
@throws AssertionError if the actual {@code Comparable} is {@code null}.
@throws AssertionError if the actual {@code Comparable} is not greater than or equal to the given one.