The test strategy identifies multiple test levels, which are going to be performed for the project. Activities at each level must be planned well in advance and it has to be formally documented. Based on the individual plans only, the individual test levels are carried out.

Entry means the entry point to that phase. For example, for unit testing, the coding must be complete and then only one can start unit testing. Task is the activity that is performed. Validation is the way in which the progress and correctness and compliance are verified for that phase. Exit tells the completion criteria of that phase, after the validation is done. For example, the exit criterion for unit testing is all unit test cases must pass.

The unit test plan is the overall plan to carry out the unit test activities. The lead tester prepares it and it will be distributed to the individual testers, which contains the following sections.

The unit test plan must clearly specify the scope of unit testing. In this, normally the basic input/output of the units along with their basic functionality will be tested. In this case mostly the input units will be tested for the format, alignment, accuracy and the totals. The UTP will clearly give the rules of what data types are present in the system, their format and their boundary conditions. This list may not be exhaustive; but it is better to have a complete list of these details.

The sequences of test activities that are to be carried out in this phase are to be listed in this section. This includes, whether to execute positive test cases first or negative test cases first, to execute test cases based on the priority, to execute test cases based on test groups etc. Positive test cases prove that the system performs what is supposed to do; negative test cases prove that the system does not perform what is not supposed to do. Testing the screens, files, database etc., are to be given in proper sequence.

How the independent functionalities of the units are tested which excludes any communication between the unit and other units. The interface part is out of scope of this test level. Apart from the above sections, the following sections are addressed, very specific to unit testing.

• Unit Testing Tools
• Priority of Program units
• Naming convention for test cases
• Status reporting mechanism
• Regression test approach
• ETVX criteria

The integration test plan is the overall plan for carrying out the activities in the integration test level, which contains the following sections.

This section clearly specifies the kinds of interfaces fall under the scope of testing internal, external interfaces, with request and response is to be explained. This need not go deep in terms of technical details but the general approach how the interfaces are triggered is explained.

When there are multiple modules present in an application, the sequence in which they are to be integrated will be specified in this section. In this, the dependencies between the modules play a vital role. If a unit B has to be executed, it may need the data that is fed by unit A and unit X. In this case, the units A and X have to be integrated and then using that data, the unit B has to be tested. This has to be stated to the whole set of units in the program. Given this correctly, the testing activities will lead to the product, slowly building the product, unit by unit and then integrating them.

The system test plan is the overall plan carrying out the system test level activities. In the system test, apart from testing the functional aspects of the system, there are some special testing activities carried out, such as stress testing etc. The following are the sections normally present in system test plan.

This section defines the scope of system testing, very specific to the project. Normally, the system testing is based on the requirements. All requirements are to be verified in the scope of system testing. This covers the functionality of the product. Apart from this what special testing is performed are also stated here.

The requirements can be grouped in terms of the functionality. Based on this, there may be priorities also among the functional groups. For example, in a banking application, anything related to customer accounts can be grouped into one area, anything related to inter-branch transactions may be grouped into one area etc. Same way for the product being tested, these areas are to be mentioned here and the suggested sequences of testing of these areas, based on the priorities are to be described.

The client at their place performs the acceptance testing. It will be very similar to the system test performed by the http://onestoptesting.com/Introduction/Test-plan.Asp# - Since this is just one level of testing done by the client for the overall product, it may include test cases including the unit and integration test level details.