# Statement test and coverage

###### tags: `White Box Testing Tech` `ISTQB` `Software Testing` `SQA`

## Statement testing and coverage
Statement testing is testing aimed at exercising programming statements.

Remember: **we are only interested in executable statements**, so we do not count non-executable statements at all **when we are measuring statement coverage**

Having explored flow charts and flow graphs a little, you will see that flow charts are very good at showing you where the executable statements are; **they are all represented by diamonds or rectangles and where there is no rectangle there is no executable code.**

By setting A = 2 and X = 2 at point a, every statement will be executed once.
==However, what if the first decision should be an OR rather than an AND? The test would not have detected the error, since the condition will be true in both cases.== :question:

==Similarly, if the second decision should have stated X > 2 this error would have gone undetected because the value of A guarantees that the condition is true. Also, there is a path through the program in which X goes unchanged (the path abeh). If this were an error it would also go undetected.== :question:

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只用都執行過的方式，就會檢查不出一些狀況，就如上面兩個情況，這就是他要表達的意思。
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How many test cases would be needed for 100 per cent statement coverage?
A: 4 test case 80,60,40,38

>Exercise 4.8
Now using the program Grading in Exercise 4.7 again, try to calculate whether 100 per cent statement coverage is achieved with a given set of data (this would be a K4 level question in the exam).
Suppose we ran two test cases, as follows:
Test Case 1 StudentScore = 50
Test Case 2 StudentScore = 30
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1. Would 100 per cent statement coverage be achieved?
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A: No
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2. If not, which lines of pseudo code will not be exercised?
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A:11,14 will not exercise.
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