Add more tests of toStringDeep. (#10346)

* Add more tests of toStringDeep.

These tests will help ensure toStringDeep behavior is not regressed
by refactoring toStringDeep to support structured data.

packages/flutter/test/foundation/tree_diagnostics_mixin_test.dart

@@ -40,18 +40,19 @@ void main() {
       ],
     );
 
-    final String dump = tree.toStringDeep().replaceAll(new RegExp(r'#\d+'), '');
-    expect(dump, equals('''TestTree
- ├─child node A: TestTree
+    final String dump =
+        tree.toStringDeep().replaceAll(new RegExp(r'#\d+'), '#000');
+    expect(dump, equals('''TestTree#000
+ ├─child node A: TestTree#000
  │
- ├─child node B: TestTree
- │ ├─child node B1: TestTree
+ ├─child node B: TestTree#000
+ │ ├─child node B1: TestTree#000
  │ │
- │ ├─child node B2: TestTree
+ │ ├─child node B2: TestTree#000
  │ │
- │ ├─child node B3: TestTree
+ │ ├─child node B3: TestTree#000
  │ │
- ├─child node C: TestTree
+ ├─child node C: TestTree#000
  │
 '''));
   });

packages/flutter/test/widgets/framework_test.dart

@@ -467,4 +467,40 @@ void main() {
       <Key>[null, key1, null, key2, null],
     );
   });
+
+  testWidgets('Element diagnostics', (WidgetTester tester) async {
+    GlobalKey key0;
+    await tester.pumpWidget(new Column(
+      key: key0 = new GlobalKey(),
+      children: <Widget>[
+        new Container(),
+        new Container(key: new GlobalKey()),
+        new Container(child: new Container()),
+        new Container(key: new GlobalKey()),
+        new Container(),
+      ],
+    ));
+    final MultiChildRenderObjectElement element = key0.currentContext;
+
+    final String dump =
+        element.toStringDeep().replaceAll(new RegExp(r'#\d+'), '#000');
+    expect(dump, equals('''Column([GlobalKey#000]; renderObject: RenderFlex#000)
+├Container()
+│└LimitedBox(maxWidth: 0.0; maxHeight: 0.0; renderObject: RenderLimitedBox#000 relayoutBoundary=up1)
+│ └ConstrainedBox(BoxConstraints(biggest); renderObject: RenderConstrainedBox#000 relayoutBoundary=up2)
+├Container([GlobalKey#000])
+│└LimitedBox(maxWidth: 0.0; maxHeight: 0.0; renderObject: RenderLimitedBox#000 relayoutBoundary=up1)
+│ └ConstrainedBox(BoxConstraints(biggest); renderObject: RenderConstrainedBox#000 relayoutBoundary=up2)
+├Container()
+│└Container()
+│ └LimitedBox(maxWidth: 0.0; maxHeight: 0.0; renderObject: RenderLimitedBox#000 relayoutBoundary=up1)
+│  └ConstrainedBox(BoxConstraints(biggest); renderObject: RenderConstrainedBox#000 relayoutBoundary=up2)
+├Container([GlobalKey#000])
+│└LimitedBox(maxWidth: 0.0; maxHeight: 0.0; renderObject: RenderLimitedBox#000 relayoutBoundary=up1)
+│ └ConstrainedBox(BoxConstraints(biggest); renderObject: RenderConstrainedBox#000 relayoutBoundary=up2)
+└Container()
+ └LimitedBox(maxWidth: 0.0; maxHeight: 0.0; renderObject: RenderLimitedBox#000 relayoutBoundary=up1)
+  └ConstrainedBox(BoxConstraints(biggest); renderObject: RenderConstrainedBox#000 relayoutBoundary=up2)
+'''));
+  });
 }

packages/flutter/test/widgets/table_test.dart

@@ -497,5 +497,55 @@ void main() {
     expect(table.row(0).length, 2);
   });
 
+  testWidgets('Table widget diagnostics', (WidgetTester tester) async {
+    GlobalKey key0;
+    final Table table = new Table(
+        key: key0 = new GlobalKey(),
+        defaultColumnWidth: const IntrinsicColumnWidth(),
+        children: <TableRow>[
+          new TableRow(
+            children: <Widget>[
+              const Text('A'), const Text('B'), const Text('C')
+            ]
+          ),
+          new TableRow(
+            children: <Widget>[
+              const Text('D'), const Text('EEE'), const Text('F')
+            ]
+          ),
+          new TableRow(
+            children: <Widget>[
+              const Text('G'), const Text('H'), const Text('III')
+            ]
+          ),
+        ]
+      );
+    await tester.pumpWidget(table);
+    final RenderObjectElement element = key0.currentContext;
+
+    final String dump =
+        element.toStringDeep().replaceAll(new RegExp(r'#\d+'), '#000');
+    expect(dump, equals('''Table([GlobalKey#000]; renderObject: RenderTable#000)
+├Text("A")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+├Text("B")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+├Text("C")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+├Text("D")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+├Text("EEE")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+├Text("F")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+├Text("G")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+├Text("H")
+│└RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+└Text("III")
+ └RichText(renderObject: RenderParagraph#000 relayoutBoundary=up1)
+'''));
+  });
+
   // TODO(ianh): Test handling of TableCell object
 }