Theoretically, this should marginally decrease the duration of our unit
test suite. In my testing, for 1 iteration each (i.e. noise is very
possible), the duration changed from 9m 32s to 8m 21s – a 71s
improvement.
---
To identify tests that were running with robolectric that didn't need to
be, I removed the @RunWith(FenixRobo... from all relevant files:
sed -i '' "/@RunWith(FenixRobolectric/d" app/src/test/**/*.kt
I ran the tests and discovered which ones failed from the Classes tab of
the index.html test result file. Something like:
tests = document.querySelectorAll('table')[3].querySelectorAll('tr');
failureElements = tests.querySelectorAll('.failures');
// TODO: extract the test names
Then I copied these results to a text file and compared them to all the
files that had robolectric test runners to figure out which ones still
pass:
comm -1 -2 failures.txt changed_files.txt > robolectric_not_needed.txt
And undid the changes to the failing files:
for i in $(cat robolectric_not_needed.txt); do git checkout $i; done
Then I removed the import statements on those files:
for i in $(cut changed_files.txt); do sed -i '' "/import.*RunWith/d" $i; done
for i in $(cat changed_files.txt); do sed -i '' "/import.*RobolectricTestRunner/d" $i; done
This is how we can apply the new test runner to remove duplication.
This commit was generated programmatically with the following commands:
```
// Replace test runners with new one.
find app/src/test -type f -exec gsed -i "s/@RunWith(RobolectricTestRunner::class)/@RunWith(FenixRobolectricTestRunner::class)/" {} +
find app/src/test -type f -exec gsed -i "s/@RunWith(AndroidJUnit4::class)/@RunWith(FenixRobolectricTestRunner::class)/" {} +
// Replace imports of old test runners with new one
find app/src/test -type f -exec gsed -i "s/org.robolectric.RobolectricTestRunner/org.mozilla.fenix.helpers.FenixRobolectricTestRunner/" {} +
find app/src/test -type f -exec gsed -i "s/androidx.test.ext.junit.runners.AndroidJUnit4/org.mozilla.fenix.helpers.FenixRobolectricTestRunner/" {} +
// Remove unused imports
find app/src/test -type f -exec gsed -i "/@Config(application = TestApplication::class)/d" {} +
find app/src/test -type f -exec gsed -i "/import org.mozilla.fenix.TestApplication/d" {} +
find app/src/test -type f -exec gsed -i "/import org.robolectric.annotation.Config/d" {} +
```
Where gsed is the GNU version of sed installed via homebrew. After
running these commands, I need to manually clean up the following files:
- FenixRobolectricTestRunner
- LocaleManagerExtensionTest