@Test public void initialStateIsValid() { IsValid valid = new IsValid(); assertTrue(valid.isValid()); }
public boolean isValid() { return valid; }
IsValid { public boolean isValid() { return valid; } }
IsValid { public boolean isValid() { return valid; }  }
IsValid { public boolean isValid() { return valid; }  void invalidate(); boolean isValid(); }
IsValid { public boolean isValid() { return valid; }  void invalidate(); boolean isValid();  }