So I went ahead to release my own unit testing framework for VBScript. I created an interface called IAssert that has the following methods:
void AreEqual(object expected, object actual);
void AreEqual(object expected, object actual, string message);
void AreNotEqual(object notExpected, object actual);
void AreNotEqual(object notExpected, object actual, string message);
void Fail(string message);
void IsFalse(bool condition);
void IsFalse(bool condition, string message);
void IsTrue(bool condition);
void IsTrue(bool condition, string message);
These are minimum set of method often found in most of unit testing frameworks. We can always add more when needed. Note that I did not have IsEmpty or IsNothing methods. That is because I believe we should use the language built-in method to best reflect the language semantics. For example, instead of having an IsEmpty method in the testing framework, we should use IsTrue(IsEmpty(myVar)) where we are using the VBScript built-in function.
In environments that we have control over the host, the host will supply an Assert object that can route the testing results to one of the existing unit testing framework, such as NUnit, so that we can reuse the test runners and report functionalities. In the environments that we do not have control of the host, we can supply an Assert class in VBScript itself, much like what ASPUnit does.
If you look at my VBScriptTest project, you will notice that it uses NUnit framework. It has a single NUnit test case that walks the entire hierarchy under the VBScripts folder. When we need to write a new test case, we just simply add a .vbs file under the VBScripts folder. The following is an example VBScript unit test case:
Assert.IsTrue(IsEmpty(a), "Unassigned variable must be empty")
Because I have use a single NUnit test case to run all the VBScripts, the message parameter is an important parameter to distinguish the test case in the situation of failed test case.