src/main/java/org/fest/assertions/GenericAssert.java
public final @NotNull S isSameAs(@Nullable A expected) {
    failIfNotSame(customErrorMessage(), rawDescription(), actual, expected);
    return myself();
  }
public final @NotNull S isSameAs(@Nullable A expected) {
    failIfNotSame(customErrorMessage(), rawDescription(), actual, expected);
    return myself();
  }
Verifies that the actual value is the same as the given one.

@param expected the given value to compare the actual value to.
@return this assertion object.
@throws AssertionError if the actual value is not the same as the given one.