Add Unit Tests

[CreatCodeBuild]

Writing a framework is a big game. Test, test and test.

[CreatCodeBuild]

I should not proceed with new features without having unit tests ready since GET and POST are ready now.

[CreatCodeBuild]

I have not figured out how to write tests for this project. It is because that this project is poorly structured so that it is very hard to come up a clean way to test it.

The design of the framework is not clear and codes are twisted together.

I should re organize the code to make more testable before adding any new features.

[CreatCodeBuild]

Added unit tests for Stream

[CreatCodeBuild]

Should unit test all code before adding more features to the framework.