Flutter test coverage will not report untested files

[100cm]

I run the flutter test --coverage as follows

and here are my project's files;

the generated Icov.info looks like this:

SF:lib/components/button.component.dart
DA:12,1
DA:29,1
DA:45,1
DA:47,1
DA:48,1
DA:49,1
DA:50,1
DA:51,2
DA:52,1
DA:53,1
DA:56,2
DA:57,1
DA:59,2
DA:60,1
DA:61,1
DA:62,1
DA:63,3
DA:64,2
DA:65,1
DA:66,1
DA:67,1
DA:70,1
DA:71,2
DA:72,1
LF:24
LH:24
end_of_record
SF:lib/components/button.css.dart
DA:4,1
DA:6,2
DA:7,2
DA:8,1
DA:10,1
DA:16,3
DA:53,1
DA:73,0
LF:8
LH:7
end_of_record
SF:lib/environment.dart
DA:6,1
DA:8,2
DA:9,1
DA:11,1
DA:13,2
DA:14,2
DA:15,2
DA:16,1
LF:8
LH:8
end_of_record

why coverage didn't include the untested files?

i know how to show coverage by tools like genHtml locv-sumary

I just want to know how to generate the Locv.info that includes untested files in my projects

[100cm]

i searched the same question on stack overflow:

https://stackoverflow.com/questions/54602840/how-can-i-generate-test-coverage-of-untested-files-on-my-flutter-tests

but none answer it.

[BigBl4ckW0lf]

I have found a temporary workaround for this issue.

If you create a "fileLoader_test.dart" file like this:

// ignore_for_file: unused_import
import 'package:my_package/FileA.dart';
import 'package:my_package/folder_one/lib.dart';
import 'package:my_package/folder_two/lib.dart';
void main() { }

then "flutter test --coverage" will recognize all files specified in the "lib.dart" files.

[100cm]

yep @BigBl4ckW0lf I got this, but i must import all files in my project.

[jonahwilliams]

If a file is not reachable by the entrypoint that executes coverage, then because the VM has never loaded the library it doesn't return any coverage information for us.

The tester process could walk the filesystem and insert the remaining file URIs into the coverage report - it's not clear that would always be meaningful information or the right thing to do.

[dangilbert]

I'm using @BigBl4ckW0lf's idea but didn't want to manually add them in case I forget. I've got a CI step which creates the file before running the coverage using this script

#!/bin/sh
file=test/coverage_helper_test.dart
echo "// Helper file to make coverage work for all dart files\n" > $file
echo "// ignore_for_file: unused_import" >> $file
find lib -name '*.dart' | cut -c4- | awk -v package=$1 '{printf "import '\''package:%s%s'\'';\n", package, $1}' >> $file
echo "\nvoid main(){}" >> $file

Just call it with your package name as an argument and it'll generate a test including all dart files in the lib folder

[SBNTT]

Here is a version which exclude .g.dart files

#!/bin/sh
file=test/coverage_helper_test.dart
echo "// Helper file to make coverage work for all dart files\n" > $file
echo "// ignore_for_file: unused_import" >> $file
find lib -not -name '*.g.dart' -and -name '*.dart' | cut -c4- | awk -v package=$1 '{printf "import '\''package:%s%s'\'';\n", package, $1}' >> $file
echo "void main(){}" >> $file