What is Statement Coverage Testing?
Statement coverage testing technique involves execution of all statements of the source code at least once. It is used to calculate the total number of executed statements in the source code out of total statements present in the source code.
According to ISTQB Glossary, a Statement coverage is the percentage of executable statements that have been exercised by a test suite. Therefore, to achieve 100% Statement coverage we have to make sure that every statement in the code is executed at least once. So we will need test case(s) executed in such a way that every statement of the code is executed at least once during the test execution.
Example of Statement coverage :
Read X
Read Y
if X>Y
Print “X is greater than Y”
else
Print "Y is greater than X"
endif
Set1 : If X =8, Y =4
Number of statements Executed: 5
Total no of statements in the source code: 7
Statement coverage =5/7*100 = 71.00 %
Set2 :If X =1, Y =7
Number of statements Executed: 6
Total no of statements in the source code: 7
Statement coverage =6/7*100 = 85.20 %
Advantage of statement coverage:
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- It verifies what the written code is expected to do and not to do
- It measures the quality of code written
- It checks the flow of different paths in the program and it also ensure that whether those path are tested or not
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What is covered by Statement Coverage testing?
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- Unused Statements
- Dead Code
- Unused Branches
- Missing Statements
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