Open Radar

 
Summary:
When using the code coverage tool, it is possible to get a false negative on a line of code not being run. Specifically, in an else statement, the closing brace (}) will be marked as not being run.

Steps to Reproduce:
1. Write code in the form:

if condition 1 {
    return x
} else if condition 2 {
    return y
} else {
    return nil
} //code coverage will report < 100% and mark this line as untested

2. Write unit tests that exercise the code

3. Turn on test coverage

4. Run the unit tests

5. View the coverage report. Note < 100% coverage for the file containing the code

6. Click the arrow to see which code is missed. See that it's the closing braces in the method that returned nil

Attached project demonstrates this

Expected Results:
100% code coverage

Actual Results:
< 100% code coverage with the closing brace being marked as unrun

Version:
Xcode Version 8.1 (8B62)
macOS 10.12.1 (16B2555)


Notes:
Can workaround with this code instead:
if condition 1 {
    return x
} else if condition 2 {
    return y
}
return nil //code coverage reports 100%

Configuration:
Swift
Collect Test Coverage

Attachments:
'Test.zip' and 'Screen Shot 2016-11-25 at 1.32.07 PM.png' were successfully uploaded.