src/main/java/org/fest/assertions/internal/BigDecimals.java
public void assertIsNegative(Description description, BigDecimal actual) {
    comparables.assertLessThan(description, actual, ZERO);
  }
public void assertIsNegative(Description description, BigDecimal actual) {
    comparables.assertLessThan(description, actual, ZERO);
  }
Verifies that the actual value is negative.

@param description the description of the <em>actual</em> value.
@param actual the <em>actual</em> value.