Unify watcher tests

pkgs/watcher/test/directory_watcher/file_tests.dart

@@ -11,13 +11,13 @@ import 'package:watcher/src/utils.dart';
 
 import '../utils.dart';
 
-void fileTests() {
+void fileTests({required bool isNative}) {
   for (var i = 0; i != runsPerTest; ++i) {
-    _fileTests();
+    _fileTests(isNative: isNative);
   }
 }
 
-void _fileTests() {
+void _fileTests({required bool isNative}) {
   test('does not notify for files that already exist when started', () async {
     // Make some pre-existing files.
     writeFile('a.txt');
@@ -297,6 +297,29 @@ void _fileTests() {
       })));
     });
 
+    test(
+        'emits events for many nested files moved out then immediately back in',
+        () async {
+      withPermutations(
+          (i, j, k) => writeFile('dir/sub/sub-$i/sub-$j/file-$k.txt'));
+
+      await startWatcher(path: 'dir');
+
+      renameDir('dir/sub', 'sub');
+      renameDir('sub', 'dir/sub');
+
+      if (isNative) {
+        await inAnyOrder(withPermutations(
+            (i, j, k) => isRemoveEvent('dir/sub/sub-$i/sub-$j/file-$k.txt')));
+        await inAnyOrder(withPermutations(
+            (i, j, k) => isAddEvent('dir/sub/sub-$i/sub-$j/file-$k.txt')));
+      } else {
+        // Polling watchers can't detect this as directory contents mtimes
+        // aren't updated when the directory is moved.
+        await expectNoEvents();
+      }
+    });
+
     test(
         'emits events for many files added at once in a subdirectory with the '
         'same name as a removed file', () async {
@@ -334,4 +357,32 @@ void _fileTests() {
       }
     });
   });
+
+  test(
+      'does not notify about the watched directory being deleted and '
+      'recreated immediately before watching', () async {
+    createDir('dir');
+    writeFile('dir/old.txt');
+    deleteDir('dir');
+    createDir('dir');
+
+    await startWatcher(path: 'dir');
+    writeFile('dir/newer.txt');
+    await expectAddEvent('dir/newer.txt');
+  });
+
+  test('does not suppress files with the same prefix as a directory', () async {
+    // Regression test for https://github.com/dart-lang/watcher/issues/83
+    writeFile('some_name.txt');
+
+    await startWatcher();
+
+    writeFile('some_name/some_name.txt');
+    deleteFile('some_name.txt');
+
+    await inAnyOrder([
+      isAddEvent('some_name/some_name.txt'),
+      isRemoveEvent('some_name.txt')
+    ]);
+  });
 }

pkgs/watcher/test/directory_watcher/linux_test.dart

@@ -16,25 +16,10 @@ import 'link_tests.dart';
 void main() {
   watcherFactory = LinuxDirectoryWatcher.new;
 
-  fileTests();
+  fileTests(isNative: true);
   linkTests(isNative: true);
 
   test('DirectoryWatcher creates a LinuxDirectoryWatcher on Linux', () {
     expect(DirectoryWatcher('.'), const TypeMatcher<LinuxDirectoryWatcher>());
   });
-
-  test('emits events for many nested files moved out then immediately back in',
-      () async {
-    withPermutations(
-        (i, j, k) => writeFile('dir/sub/sub-$i/sub-$j/file-$k.txt'));
-    await startWatcher(path: 'dir');
-
-    renameDir('dir/sub', 'sub');
-    renameDir('sub', 'dir/sub');
-
-    await inAnyOrder(withPermutations(
-        (i, j, k) => isRemoveEvent('dir/sub/sub-$i/sub-$j/file-$k.txt')));
-    await inAnyOrder(withPermutations(
-        (i, j, k) => isAddEvent('dir/sub/sub-$i/sub-$j/file-$k.txt')));
-  });
 }

pkgs/watcher/test/directory_watcher/mac_os_test.dart

@@ -16,50 +16,10 @@ import 'link_tests.dart';
 void main() {
   watcherFactory = MacOSDirectoryWatcher.new;
 
-  fileTests();
+  fileTests(isNative: true);
   linkTests(isNative: true);
 
   test('DirectoryWatcher creates a MacOSDirectoryWatcher on Mac OS', () {
     expect(DirectoryWatcher('.'), const TypeMatcher<MacOSDirectoryWatcher>());
   });
-
-  test(
-      'does not notify about the watched directory being deleted and '
-      'recreated immediately before watching', () async {
-    createDir('dir');
-    writeFile('dir/old.txt');
-    deleteDir('dir');
-    createDir('dir');
-
-    await startWatcher(path: 'dir');
-    writeFile('dir/newer.txt');
-    await expectAddEvent('dir/newer.txt');
-  });
-
-  test('emits events for many nested files moved out then immediately back in',
-      () async {
-    withPermutations(
-        (i, j, k) => writeFile('dir/sub/sub-$i/sub-$j/file-$k.txt'));
-
-    await startWatcher(path: 'dir');
-
-    renameDir('dir/sub', 'sub');
-    renameDir('sub', 'dir/sub');
-
-    await inAnyOrder(withPermutations(
-        (i, j, k) => isRemoveEvent('dir/sub/sub-$i/sub-$j/file-$k.txt')));
-    await inAnyOrder(withPermutations(
-        (i, j, k) => isAddEvent('dir/sub/sub-$i/sub-$j/file-$k.txt')));
-  });
-  test('does not suppress files with the same prefix as a directory', () async {
-    // Regression test for https://github.com/dart-lang/watcher/issues/83
-    writeFile('some_name.txt');
-
-    await startWatcher();
-
-    writeFile('some_name/some_name.txt');
-    deleteFile('some_name.txt');
-
-    await expectRemoveEvent('some_name.txt');
-  });
 }

pkgs/watcher/test/directory_watcher/polling_test.dart

@@ -21,7 +21,7 @@ void main() {
   group('with mock mtime', () {
     setUp(enableMockModificationTimes);
 
-    fileTests();
+    fileTests(isNative: false);
     linkTests(isNative: false);
 
     test('does not notify if the modification time did not change', () async {
@@ -71,7 +71,7 @@ void main() {
   group('with real mtime', () {
     setUp(enableWaitingForDifferentModificationTimes);
 
-    fileTests();
+    fileTests(isNative: false);
     linkTests(isNative: false);
   });
 }

pkgs/watcher/test/directory_watcher/windows_test.dart

@@ -21,7 +21,7 @@ import 'link_tests.dart';
 void main() {
   watcherFactory = WindowsDirectoryWatcher.new;
 
-  fileTests();
+  fileTests(isNative: true);
   linkTests(isNative: true);
 
   test('DirectoryWatcher creates a WindowsDirectoryWatcher on Windows', () {