public void Replace_WhenCalledImmediatelyAfteInitialize_ShouldNotThrowNullReferenceException() { //Arrange verbEx = VerbalExpressions.DefaultExpression; string value = "value"; bool hasThrownNullReferenceEx = false; //Act try { verbEx.Replace(value); } catch (NullReferenceException) { hasThrownNullReferenceEx = true; } //Assert Assert.IsFalse(hasThrownNullReferenceEx); }