Converted Observatory heap-snapshot element

runtime/observatory/tests/observatory_ui/heap_snapshot/element_test.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:html';
+import 'dart:async';
+import 'package:unittest/unittest.dart';
+import 'package:observatory/models.dart' as M;
+import 'package:observatory/src/elements/containers/virtual_tree.dart';
+import 'package:observatory/src/elements/heap_snapshot.dart';
+import '../mocks.dart';
+
+main() {
+  HeapSnapshotElement.tag.ensureRegistration();
+
+  final tTag = VirtualTreeElement.tag.name;
+
+  const vm = const VMMock();
+  const isolate = const IsolateRefMock();
+  final events = new EventRepositoryMock();
+  final notifs = new NotificationRepositoryMock();
+  final snapshots = new HeapSnapshotRepositoryMock();
+  final instances = new InstanceRepositoryMock();
+  test('instantiation', () {
+    final e = new HeapSnapshotElement(vm, isolate, events, notifs, snapshots,
+                                      instances);
+    expect(e, isNotNull, reason: 'element correctly created');
+  });
+  test('elements created', () async {
+    final controller
+        = new StreamController<M.HeapSnapshotLoadingProgressEvent>.broadcast();
+    final snapshots = new HeapSnapshotRepositoryMock(
+      getter: (M.IsolateRef i, bool gc) {
+        expect(i, equals(isolate));
+        expect(gc, isFalse);
+        return controller.stream;
+      }
+    );
+    final e = new HeapSnapshotElement(vm, isolate, events, notifs, snapshots,
+                                      instances);
+    document.body.append(e);
+    await e.onRendered.first;
+    expect(e.children.length, isNonZero, reason: 'has elements');
+    expect(e.querySelectorAll(tTag).length, isZero);
+    controller.add(const HeapSnapshotLoadingProgressEventMock(
+      progress: const HeapSnapshotLoadingProgressMock(
+        status: M.HeapSnapshotLoadingStatus.fetching
+      )
+    ));
+    await e.onRendered.first;
+    expect(e.querySelectorAll(tTag).length, isZero);
+    controller.add(const HeapSnapshotLoadingProgressEventMock(
+      progress: const HeapSnapshotLoadingProgressMock(
+        status: M.HeapSnapshotLoadingStatus.loading
+      )
+    ));
+    controller.add(new HeapSnapshotLoadingProgressEventMock(
+      progress: new HeapSnapshotLoadingProgressMock(
+        status: M.HeapSnapshotLoadingStatus.loaded,
+        snapshot: new HeapSnapshotMock(timestamp: new DateTime.now())
+      )
+    ));
+    controller.close();
+    await e.onRendered.first;
+    expect(e.querySelectorAll(tTag).length, equals(1));
+    e.remove();
+    await e.onRendered.first;
+    expect(e.children.length, isZero, reason: 'is empty');
+  });
+}