Collect test coverage

moor/.gitignore

@@ -2,6 +2,9 @@
 # Created by https://www.gitignore.io/api/dart,intellij
 # Edit at https://www.gitignore.io/?templates=dart,intellij
 
+coverage.json
+lcov.info
+
 ### Dart ###
 # See https://www.dartlang.org/guides/libraries/private-files
 

moor/mono_pkg.yaml

@@ -6,4 +6,4 @@ stages:
       - dartanalyzer: --fatal-infos --fatal-warnings .
       - dartfmt
   - unit_test:
-      - command: pub run build_runner test --delete-conflicting-outputs
+      - command: dart tool/coverage.dart

moor/pubspec.yaml

@@ -19,7 +19,13 @@ dev_dependencies:
   test: ^1.5.3
   test_api:
   mockito: ^4.0.0
+  grinder: ^0.8.0
+  coverage: ^0.12.0
 
 dependency_overrides:
   moor_generator:
-    path: ../moor_generator
+    path: ../moor_generator
+  coveralls: ^5.1.0
+  # Temporarily use my fork because it can collect coverage when running tests with the test runner
+  coverage:
+    git: https://github.com/simolus3/coverage.git

moor/tool/coverage.dart

@@ -0,0 +1,41 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:grinder/grinder_sdk.dart';
+import 'package:coverage/coverage.dart';
+import 'package:path/path.dart';
+
+const int _vmPort = 9876;
+
+Future<void> main(List<String> args) async {
+  // First, generate the build script, see
+  // https://github.com/dart-lang/build/blob/3208cfe94c475ed3e1ec44c227aadaddaeac263d/build_runner/bin/build_runner.dart#L65
+  Pub.run('build_runner', arguments: ['generate-build-script']);
+
+  // Start coverage collection (resume isolates, don't wait for pause, collect
+  // when isolates exit).
+  final collectorFuture = collect(Uri.parse('http://localhost:$_vmPort'), true, false, true);
+
+  // Next, run the test script in another dart process that has the vm services
+  // enabled.
+  final tests = join(File.fromUri(Platform.script).parent.path, 'tester.dart');
+  // not using Dart.run because that only prints to stdout after the process has
+  // completed.
+  await Dart.runAsync(tests, vmArgs: ['--enable-vm-service=$_vmPort', '--pause-isolates-on-exit']);
+
+  File('coverage.json').writeAsStringSync(json.encode(await collectorFuture));
+
+  print('coverage collected - formatting as lcov');
+
+  print('formatting to .lcov format');
+  await Pub.runAsync('coverage:format_coverage', arguments: [
+    '--lcov',
+    '--packages=.packages',
+    '--report-on=lib',
+    '-i',
+    'coverage.json',
+    '-o',
+    'lcov.info'
+  ]);
+}

moor/tool/tester.dart

@@ -0,0 +1,9 @@
+import 'package:test_core/src/executable.dart' as test;
+import '../.dart_tool/build/entrypoint/build.dart' as builder;
+
+void main() async {
+  // Run the build runner
+  await builder.main(['build', '--delete-conflicting-outputs']);
+  // Run tests
+  await test.main([]);
+}