How calculated the code coverage in unit test infrastructure

I'm looking for documentation on how the unit test framework calculates code coverage.

I just recently installed the unit test framework and I had mixed results with the code coverage feature.  I manually calculated all the branch points in my vi, but the framework calculates more that I can think of, which gives a value of code coverage less than stellar (51%).  Is there documentation for how it is calculated?  I'm either missing something fundamental, or there is a bug with the framework.

My vi consists of a loop (with shift registers) uninitialized which runs once.  On the inside of the loop is a business T/F structure that leads to a listed case structure possible two cases (one of which is the default value)... pretty basic.  Inside one of the structures is a loop and the other is cross.  For some reason, the unit test framework calculates 7 "flags chart run.  I use the method of "external" test harness to call all my test cases for the vi under test, b/c frankly it was easier to use than the UI provided.  I don't know if this is the cause, b/c I saw the other oddities when using it, which I'll save for another thread of discussion.

Code coverage is calculated by dividing the number of diagrams, code that was executed by the number of diagrams in your VI altogether. Each VI has at least 1 schema (schema-block real). Loops have a single diagram each, case structures and sequences have a single diagram by image and so forth (=> from your description, your VI has at least 7 diagrams). You can double-click the patterns that were not executed in the Unit Test Framework results dialog box to be displayed.

This approach does not reflect the amount or complexity of the code that contains each diagram. We looked at various ways of counting nodes, terminals, controls, son and other, that would give you a number that reflects your code with more precision. Unfortunately, neither of these approaches gives values that can easily be understood without some knowledge about the inner workings of LabVIEW. We chose to go with a solution that is completely transparent to end users.

Thank you

Herbert

Tags: NI Software

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