Add flutter_web samples (#75)

web/charts/common/test/chart/cartesian/axis/axis_test.dart

@@ -0,0 +1,60 @@
+// Copyright 2018 the Charts project authors. Please see the AUTHORS file
+// for details.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import 'package:charts_common/src/chart/cartesian/axis/axis.dart';
+import 'package:charts_common/src/chart/cartesian/axis/draw_strategy/tick_draw_strategy.dart';
+import 'package:charts_common/src/chart/cartesian/axis/scale.dart';
+import 'package:charts_common/src/chart/cartesian/axis/spec/tick_spec.dart';
+import 'package:charts_common/src/chart/cartesian/axis/static_tick_provider.dart';
+import 'package:charts_common/src/common/graphics_factory.dart';
+import 'package:charts_common/src/common/text_element.dart';
+
+import 'package:mockito/mockito.dart';
+import 'package:test/test.dart';
+
+class MockTickDrawStrategy extends Mock implements TickDrawStrategy<num> {}
+
+class MockGraphicsFactory extends Mock implements GraphicsFactory {
+  TextElement createTextElement(String _) {
+    return MockTextElement();
+  }
+}
+
+class MockTextElement extends Mock implements TextElement {}
+
+StaticTickProvider<num> _createProvider(List<num> values) =>
+    StaticTickProvider<num>(values.map((v) => TickSpec(v)).toList());
+
+void main() {
+  test('changing first tick only', () {
+    var axis = NumericAxis(
+      tickProvider: _createProvider([1, 10]),
+    );
+
+    var tester = AxisTester(axis);
+    axis.tickDrawStrategy = MockTickDrawStrategy();
+    axis.graphicsFactory = MockGraphicsFactory();
+    tester.scale.range = new ScaleOutputExtent(0, 300);
+
+    axis.updateTicks();
+
+    axis.tickProvider = _createProvider([5, 10]);
+    axis.updateTicks();
+
+    // The old value should still be there as it gets animated out, but the
+    // values should be sorted by their position.
+    expect(tester.axisValues, equals([1, 5, 10]));
+  });
+}