I might be missing something here but, the way you wrote the code in your question, conditions A and B are completely independent of each other. You therefore won’t cover all of the code unless you test both conditionals. Statement coverage is used to derive scenario based upon the structure of the code under test. In MCDC each condition should be evaluated at least once which affects the decision outcome independently.
- Edge coverage reports which branches or code decision points were executed to complete the test.
- The goal of condition coverage is to check individual outcomes for each logical condition.
- Predicate coverage is a more fine-grained metric that goes beyond just examining branches and focuses on evaluating conditions (predicates) within those branches.
- If it’s somewhat stable, and won’t change much, you should consider focusing your testing efforts elsewhere.
- Planning a lot of changes to this particular method in the foreseeable future may justify extra unit test coverage.
Connect and share knowledge within a single location that is structured and easy to search. The higher the probability that defects will cause costly production failures, the more severe the level of coverage you need to choose. For example, if the outcomes are binary, you need to test both multiple condition coverage True and False outcomes. Assume this function is a part of some bigger program and this program was run with some test suite. The building blocks of TMAP give you all the guidance you need to meet the testing and quality challenges in your specific information technology environment.
Per decision point.
That’s why there are many different methods of reporting this metric. All these methods focus on covering the most important combinations. It is very much similar to decision coverage, but it offers better sensitivity to control flow. For instance, path coverage implies decision, statement and entry/exit coverage. Decision coverage implies statement coverage, because every statement is part of a branch.
Combined with other test coverage methods, the aim is to develop a rigorous, yet manageable, set of regression tests. Statement Coverage is a white box testing technique in which all the executable statements in the source code are executed at least once. It is used for calculation of the number of statements in source code which have been executed. The main purpose of Statement Coverage is to cover all the possible paths, lines and statements in source code. Code coverage is a measure which describes the degree of which the source code of the program has been tested. It is one form of white box testing which finds the areas of the program not exercised by a set of test cases.
Multiple Condition Coverage Testing
In Multiple Condition Coverage for each decision all the combinations of conditions should be evaluated. This would seem to indicate that Multiple Condition Coverage, as the name suggests, only applies to conditionals with multiple statements. When using the White Box method of testing called Multiple Condition Coverage, do we take all conditional statements or just the ones with multiple conditions? There are also some sorts of defects which are affected by such tools.
The tester has access to the source code and uses this knowledge to design test cases that can verify the correctness of the software at the code level. To satisfy condition coverage, each Boolean expression X,Y and Z in above statement should be evaluated to TRUE and FALSE at least one time. I believe there should be four unit tests for this particular function.
Software authors can look at test coverage results to devise additional tests and input or configuration sets to increase the coverage over vital functions. Two common forms of test coverage are statement (or line) coverage and branch (or edge) coverage. Line coverage reports on the execution footprint of testing in terms of which lines of code were executed to complete the test. Edge coverage reports which branches or code decision points were executed to complete the test. They both report a coverage metric, measured as a percentage.
Condition Coverage or expression coverage is a testing method used to test and evaluate the variables or sub-expressions in the conditional statement. The goal of condition coverage is to check individual outcomes for each logical condition. Condition coverage offers better sensitivity to the control flow than decision coverage. In this coverage, expressions with logical operands are only considered. The target software is built with special options or libraries and run under a controlled environment, to map every executed function to the function points in the source code. The resulting output is then analyzed to see what areas of code have not been exercised and the tests are updated to include these areas as necessary.
Based on the input to the program, some of the code statements may not be executed. The goal of Statement coverage is to cover all the possible path’s, line, and statement in the code. For this reason, most people don’t bother with full combinatorial coverage. Usually testing all branches (or all conditions), will be good enough for catching bugs. Adding the extra tests for combinatorial testing won’t usually catch more bugs, but requires a lot of effort to create and maintain.