


## How to Achieve 100% Coverage in Functional Tests Despite Blind Spots?
Oct 25, 2024 am 08:14 AMShowing Coverage of Functional Tests Without Blind Spots
Problem
In the provided code, the exit method includes a condition that excludes the os.Exit(code) line from coverage results. This creates a blind spot in the coverage report, as the line is executed but not shown as green.
Solution
There are two main approaches to address this issue:
Using TestMain:
- Extract application functionality into separate classes for testing, avoiding the main function.
- Utilize the TestMain function in the testing framework to control the execution of code on the main thread.
Refactoring the Code:
- Remove the if condition from the exit method and use a different mechanism (e.g., a separate thread or a watchdog process) to terminate the process after the coverage profile is written.
- Exclude the main.go file from testing using build tags (e.g., // build !test). This approach is recommended if the main function is simple and does not require testing.
Implementation Example
Here's an updated version of the code using build tags:
<code class="go">//+build !test package main import "os" func main() { os.Exit(doFunc()) }</code>
This modified code will be excluded from coverage reports, allowing you to accurately represent the coverage of your functional tests.
Running the Tests
Build the coverage binary with:
<code class="sh">go test -c -coverpkg=. -o example -tags test</code>
Run the tests with:
<code class="sh">./example -test.coverprofile=/tmp/profile</code>
The resulting coverage report should now show 100% statement coverage, including the previously excluded line in the exit method.
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