flutter_flutter/examples/api/test/widgets/async/stream_builder.0_test.dart

// Copyright 2014 The Flutter Authors. 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:async';

import 'package:flutter/material.dart';
import 'package:flutter_api_samples/widgets/async/stream_builder.0.dart'
    as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('StreamBuilder listens to internal stream', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(const example.StreamBuilderExampleApp());

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
    expect(find.text('Awaiting bids...'), findsOneWidget);

    await tester.pump(example.StreamBuilderExampleApp.delay);

    expect(find.byIcon(Icons.check_circle_outline), findsOneWidget);
    expect(find.text(r'$1'), findsOneWidget);

    await tester.pump(example.StreamBuilderExampleApp.delay);

    expect(find.byIcon(Icons.info), findsOneWidget);
    expect(find.text(r'$1 (closed)'), findsOneWidget);
  });

  testWidgets('BidsStatus correctly displays error state', (
    WidgetTester tester,
  ) async {
    final StreamController<int> controller = StreamController<int>();
    addTearDown(controller.close);

    controller.onListen = () {
      controller.addError('Unexpected error!', StackTrace.empty);
    };

    await tester.pumpWidget(
      MaterialApp(home: example.BidsStatus(bids: controller.stream)),
    );
    await tester.pump();

    expect(find.byIcon(Icons.error_outline), findsOneWidget);
    expect(find.text('Error: Unexpected error!'), findsOneWidget);
    expect(find.text('Stack trace: ${StackTrace.empty}'), findsOneWidget);
  });

  testWidgets('BidsStatus correctly displays none state', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(
      const MaterialApp(home: example.BidsStatus(bids: null)),
    );

    expect(find.byIcon(Icons.info), findsOneWidget);
    expect(find.text('Select a lot'), findsOneWidget);
  });

  testWidgets('BidsStatus correctly displays waiting state', (
    WidgetTester tester,
  ) async {
    final StreamController<int> controller = StreamController<int>();
    addTearDown(controller.close);

    await tester.pumpWidget(
      MaterialApp(home: example.BidsStatus(bids: controller.stream)),
    );

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
    expect(find.text('Awaiting bids...'), findsOneWidget);
  });

  testWidgets('BidsStatus correctly displays active state', (
    WidgetTester tester,
  ) async {
    final StreamController<int> controller = StreamController<int>();
    addTearDown(controller.close);

    controller.onListen = () {
      controller.add(1);
    };

    await tester.pumpWidget(
      MaterialApp(home: example.BidsStatus(bids: controller.stream)),
    );
    await tester.pump();

    expect(find.byIcon(Icons.check_circle_outline), findsOneWidget);
    expect(find.text(r'$1'), findsOneWidget);
  });

  testWidgets('BidsStatus correctly displays done state', (
    WidgetTester tester,
  ) async {
    final StreamController<int> controller = StreamController<int>();
    controller.close();

    await tester.pumpWidget(
      MaterialApp(home: example.BidsStatus(bids: controller.stream)),
    );
    await tester.pump();

    expect(find.byIcon(Icons.info), findsOneWidget);
    expect(find.text('(closed)'), findsOneWidget);
  });
}