src/main/java/org/fest/assertions/Assert.java
protected final void description(@Nullable String d) {
    description(d == null ? null : new BasicDescription(d));
  }
protected final void description(@Nullable String d) {
    description(d == null ? null : new BasicDescription(d));
  }
Sets the description of the actual value, to be used in as message of any {@code AssertionError} thrown when an
assertion fails.

@param d the new description.