Unit Testing

[rjames]

This is the first and the most important level of testing. As soon as the programmer develops a unit of code the unit is tested for various scenarios. As the application is built it is much more economical to find and eliminate the bugs early on. Hence Unit Testing is the most important of all the testing levels. As the software project progresses ahead it becomes more and more costly to find and fix the bugs.

In most cases it is the developer’s responsibility to deliver Unit Tested Code.

Unit Testing Tasks and Steps:
Step 1: Create a Test Plan
Step 2: Create Test Cases and Test Data
Step 3: If applicable create scripts to run test cases
Step 4: Once the code is ready execute the test cases
Step 5: Fix the bugs if any and re test the code
Step 6: Repeat the test cycle until the “unit” is free of all bugs

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[Rahulbatra]

I want to have a good guidelines or tips on points that one must note while carrying out unit testing. Someone kindly provide the same.

[cyrus]

What are the impacts created if a unit testing is not done and the next level of testing is carried out in straight? Is it that unit testing is needed for all applications or it depends on the size of the application.