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test/text_element_test.dart

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+// 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:flutter/material.dart' show BuildContext;
+import 'package:mockito/mockito.dart';
+import 'package:flutter/widgets.dart' show InheritedWidget;
+import 'package:test/test.dart';
+import 'package:charts_flutter/src/graphics_factory.dart';
+import 'package:charts_flutter/src/text_element.dart';
+
+// Can't use Mockito annotations with BuildContext yet? Fake it.
+class FakeBuildContext extends Fake implements BuildContext {
+  @override
+  T? dependOnInheritedWidgetOfExactType<T extends InheritedWidget>(
+      {Object? aspect}) {
+    return null;
+  }
+}
+
+// Gave up trying to figure out how to use mockito for now.
+class FakeGraphicsFactoryHelper extends Fake implements GraphicsFactoryHelper {
+  double textScaleFactor;
+
+  FakeGraphicsFactoryHelper(this.textScaleFactor) {}
+
+  @override
+  double getTextScaleFactorOf(BuildContext context) => textScaleFactor;
+}
+
+void main() {
+  test('Text element gets assigned scale factor', () {
+    final context = FakeBuildContext();
+    final helper = FakeGraphicsFactoryHelper(3.0);
+    final graphicsFactory = new GraphicsFactory(context, helper: helper);
+
+    final textElement =
+        graphicsFactory.createTextElement('test') as TextElement;
+
+    expect(textElement.text, equals('test'));
+    expect(textElement.textScaleFactor, equals(3.0));
+  });
+}