File name is apparently important...

.coveragerc

@@ -1,2 +0,0 @@
-[run]
-source = ./lib

.gitignore

@@ -12,7 +12,7 @@
 coverage/*
 
 # This file is auto-generated as part of the CI process
-test/test_touch_files.dart
+test/coverage_helper_test.dart
 
 # Sentry API key
 lib/dsn.dart

find_dart_files.py

@@ -5,7 +5,7 @@ and generates a 'test' file which includes all these files.
 This is to ensure that *all* .dart files are included in test coverage.
 By default, source files which are not touched by the unit tests are not included!
 
-Ref: https://github.com/flutter/flutter/issues/27997#issue-410722816
+Ref: https://github.com/flutter/flutter/issues/27997
 """
 
 from pathlib import Path
@@ -14,7 +14,7 @@ if __name__ == '__main__':
 
     dart_files = Path('lib').rglob('*.dart')
 
-    with open("test/test_touch_files.dart", "w") as f:
+    with open("test/coverage_helper_test.dart", "w") as f:
 
         f.write("// ignore_for_file: unused_import\n\n")
 
@@ -29,7 +29,8 @@ if __name__ == '__main__':
 
         f.write("// DO NOT EDIT THIS FILE - it has been auto-generated by 'find_dart_files.py'\n")
         f.write("// It has been created to ensure that *all* source file are included in coverage data\n")
-        f.write("// Reference: https://github.com/flutter/flutter/issues/27997#issue-410722816\n\n")
+
+        f.write('import "package:test/test.dart";\n\n');
 
         f.write("// Do not actually test anything!\n")
         f.write("void main() {}\n")