Choice Chip Fix (#22589)

* choice chip fix

* added test

packages/flutter/lib/src/material/chip.dart

@@ -575,7 +575,7 @@ class InputChip extends StatelessWidget
     this.deleteIconColor,
     this.deleteButtonTooltipMessage,
     this.onPressed,
-    this.pressElevation,
+    this.pressElevation = 8.0,
     this.disabledColor,
     this.selectedColor,
     this.tooltip,
@@ -731,7 +731,7 @@ class ChoiceChip extends StatelessWidget
     this.labelStyle,
     this.labelPadding,
     this.onSelected,
-    this.pressElevation,
+    this.pressElevation = 8.0,
     @required this.selected,
     this.selectedColor,
     this.disabledColor,
@@ -908,7 +908,7 @@ class FilterChip extends StatelessWidget
     this.labelPadding,
     this.selected = false,
     @required this.onSelected,
-    this.pressElevation,
+    this.pressElevation = 8.0,
     this.disabledColor,
     this.selectedColor,
     this.tooltip,
@@ -1037,7 +1037,7 @@ class ActionChip extends StatelessWidget implements ChipAttributes, TappableChip
     this.labelStyle,
     this.labelPadding,
     @required this.onPressed,
-    this.pressElevation,
+    this.pressElevation = 8.0,
     this.tooltip,
     this.shape,
     this.clipBehavior = Clip.none,

packages/flutter/test/material/chip_test.dart

@@ -1403,6 +1403,79 @@ void main() {
     expect(deleted, true);
   });
 
+  testWidgets('Chips can be tapped', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Material(
+          child: ChoiceChip(
+            selected: false,
+            label: Text('choice chip'),
+          ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.byType(ChoiceChip));
+    expect(tester.takeException(), null);
+
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Material(
+          child: RawChip(
+            selected: false,
+            label: Text('raw chip'),
+          ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.byType(RawChip));
+    expect(tester.takeException(), null);
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: ActionChip(
+            onPressed: (){},
+            label: const Text('action chip'),
+          ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.byType(ActionChip));
+    expect(tester.takeException(), null);
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: FilterChip(
+            onSelected: (bool valueChanged){},
+            selected: false,
+            label: const Text('filter chip'),
+          ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.byType(FilterChip));
+    expect(tester.takeException(), null);
+
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Material(
+          child: InputChip(
+            selected: false,
+            label: Text('input chip'),
+          ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.byType(InputChip));
+    expect(tester.takeException(), null);
+  });
+
   testWidgets('Chip elevation works correctly', (WidgetTester tester) async {
     final ThemeData theme = ThemeData(
       platform: TargetPlatform.android,