public virtual void Close() { using (HsqlConnection testSubject = new HsqlConnection()) { Assert.That(testSubject.State == ConnectionState.Closed); testSubject.Open(); Assert.That(testSubject.State == ConnectionState.Open); testSubject.Close(); Assert.That(testSubject.State == ConnectionState.Closed); testSubject.Close(); Assert.That(testSubject.State == ConnectionState.Closed); } }