src/main/java/org/fest/assertions/internal/Objects.java
public void assertSame(Description description, Object actual, Object expected) {
    if (actual != expected) {
      String format = "expected:<%s> and actual:<%s> should refer to the same instance";
      throw failures.failure(description, new BasicErrorMessageFactory(format, expected, actual));
    }
  }
public void assertSame(Description description, Object actual, Object expected) {
    if (actual != expected) {
      String format = "expected:<%s> and actual:<%s> should refer to the same instance";
      throw failures.failure(description, new BasicErrorMessageFactory(format, expected, actual));
    }
  }
Asserts that two objects refer to the same instance.

@param description the description of the <em>actual</em> object.
@param actual the <em>actual</em> object.
@param expected the <em>expected</em> object.
@throws AssertionError if the given objects do not refer to the same instance.