fixes some gesture not getting disposed (#147112)

Author: Dimilkalathiya

packages/flutter/test/gestures/recognizer_test.dart

@@ -87,11 +87,13 @@ void main() {
     testGesture('cleans up state after winning arena', (GestureTester tester) {
       final List<String> resolutions = <String>[];
       final IndefiniteGestureRecognizer indefinite = IndefiniteGestureRecognizer();
+      addTearDown(indefinite.dispose);
       final TestPrimaryPointerGestureRecognizer<PointerUpEvent> accepting = TestPrimaryPointerGestureRecognizer<PointerUpEvent>(
         GestureDisposition.accepted,
         onAcceptGesture: () => resolutions.add('accepted'),
         onRejectGesture: () => resolutions.add('rejected'),
       );
+      addTearDown(accepting.dispose);
       expect(accepting.state, GestureRecognizerState.ready);
       expect(accepting.primaryPointer, isNull);
       expect(accepting.initialPosition, isNull);
@@ -118,11 +120,13 @@ void main() {
     testGesture('cleans up state after losing arena', (GestureTester tester) {
       final List<String> resolutions = <String>[];
       final IndefiniteGestureRecognizer indefinite = IndefiniteGestureRecognizer();
+      addTearDown(indefinite.dispose);
       final TestPrimaryPointerGestureRecognizer<PointerMoveEvent> rejecting = TestPrimaryPointerGestureRecognizer<PointerMoveEvent>(
         GestureDisposition.rejected,
         onAcceptGesture: () => resolutions.add('accepted'),
         onRejectGesture: () => resolutions.add('rejected'),
       );
+      addTearDown(rejecting.dispose);
       expect(rejecting.state, GestureRecognizerState.ready);
       expect(rejecting.primaryPointer, isNull);
       expect(rejecting.initialPosition, isNull);
@@ -156,13 +160,15 @@ void main() {
     testGesture('works properly when recycled', (GestureTester tester) {
       final List<String> resolutions = <String>[];
       final IndefiniteGestureRecognizer indefinite = IndefiniteGestureRecognizer();
+      addTearDown(indefinite.dispose);
       final TestPrimaryPointerGestureRecognizer<PointerUpEvent> accepting = TestPrimaryPointerGestureRecognizer<PointerUpEvent>(
         GestureDisposition.accepted,
         preAcceptSlopTolerance: 15,
         postAcceptSlopTolerance: 1000,
         onAcceptGesture: () => resolutions.add('accepted'),
         onRejectGesture: () => resolutions.add('rejected'),
       );
+      addTearDown(accepting.dispose);
 
       // Send one complete pointer sequence
       indefinite.addPointer(down);

packages/flutter/test/gestures/serial_tap_test.dart

@@ -190,6 +190,7 @@ void main() {
       ..onRelease = () {
         recognizedRelease = true;
       };
+      addTearDown(release.dispose);
 
     release.addPointer(down1);
     serial.addPointer(down1);
@@ -207,6 +208,7 @@ void main() {
       ..onRelease = () {
         recognizedRelease = true;
       };
+      addTearDown(release.dispose);
 
     serial.addPointer(down1);
     release.addPointer(down1);
@@ -220,6 +222,7 @@ void main() {
 
   testGesture('Fires cancel if competing recognizer declares victory', (GestureTester tester) {
     final WinningGestureRecognizer winner = WinningGestureRecognizer();
+    addTearDown(winner.dispose);
     winner.addPointer(down1);
     serial.addPointer(down1);
     tester.closeArena(1);