mirror of
https://github.com/flutter/flutter
synced 2024-10-13 11:42:54 +00:00
283 lines
8.6 KiB
Dart
283 lines
8.6 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'package:flutter_tools/src/base/context.dart';
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import '../../src/common.dart';
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void main() {
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group('AppContext', () {
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group('global getter', () {
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late bool called;
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setUp(() {
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called = false;
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});
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test('returns non-null context in the root zone', () {
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expect(context, isNotNull);
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});
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test('returns root context in child of root zone if zone was manually created', () {
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final Zone rootZone = Zone.current;
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final AppContext rootContext = context;
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runZoned<void>(() {
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expect(Zone.current, isNot(rootZone));
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expect(Zone.current.parent, rootZone);
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expect(context, rootContext);
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called = true;
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});
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expect(called, isTrue);
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});
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test('returns child context after run', () async {
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final AppContext rootContext = context;
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await rootContext.run<void>(name: 'child', body: () {
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expect(context, isNot(rootContext));
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expect(context.name, 'child');
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called = true;
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});
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expect(called, isTrue);
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});
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test('returns grandchild context after nested run', () async {
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final AppContext rootContext = context;
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await rootContext.run<void>(name: 'child', body: () async {
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final AppContext childContext = context;
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await childContext.run<void>(name: 'grandchild', body: () {
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expect(context, isNot(rootContext));
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expect(context, isNot(childContext));
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expect(context.name, 'grandchild');
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called = true;
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});
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});
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expect(called, isTrue);
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});
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test('scans up zone hierarchy for first context', () async {
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final AppContext rootContext = context;
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await rootContext.run<void>(name: 'child', body: () {
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final AppContext childContext = context;
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runZoned<void>(() {
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expect(context, isNot(rootContext));
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expect(context, same(childContext));
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expect(context.name, 'child');
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called = true;
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});
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});
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expect(called, isTrue);
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});
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});
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group('operator[]', () {
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test('still finds values if async code runs after body has finished', () async {
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final Completer<void> outer = Completer<void>();
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final Completer<void> inner = Completer<void>();
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String? value;
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await context.run<void>(
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body: () {
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outer.future.then<void>((_) {
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value = context.get<String>();
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inner.complete();
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});
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},
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fallbacks: <Type, Generator>{
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String: () => 'value',
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},
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);
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expect(value, isNull);
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outer.complete();
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await inner.future;
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expect(value, 'value');
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});
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test('caches generated override values', () async {
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int consultationCount = 0;
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String? value;
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await context.run<void>(
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body: () async {
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final StringBuffer buf = StringBuffer(context.get<String>()!);
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buf.write(context.get<String>());
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await context.run<void>(body: () {
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buf.write(context.get<String>());
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});
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value = buf.toString();
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},
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overrides: <Type, Generator>{
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String: () {
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consultationCount++;
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return 'v';
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},
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},
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);
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expect(value, 'vvv');
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expect(consultationCount, 1);
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});
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test('caches generated fallback values', () async {
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int consultationCount = 0;
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String? value;
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await context.run(
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body: () async {
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final StringBuffer buf = StringBuffer(context.get<String>()!);
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buf.write(context.get<String>());
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await context.run<void>(body: () {
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buf.write(context.get<String>());
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});
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value = buf.toString();
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},
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fallbacks: <Type, Generator>{
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String: () {
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consultationCount++;
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return 'v';
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},
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},
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);
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expect(value, 'vvv');
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expect(consultationCount, 1);
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});
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test('returns null if generated value is null', () async {
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final String? value = await context.run<String?>(
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body: () => context.get<String>(),
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overrides: <Type, Generator>{
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String: () => null,
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},
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);
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expect(value, isNull);
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});
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test('throws if generator has dependency cycle', () async {
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final Future<String?> value = context.run<String?>(
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body: () async {
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return context.get<String>();
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},
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fallbacks: <Type, Generator>{
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int: () => int.parse(context.get<String>() ?? ''),
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String: () => '${context.get<double>()}',
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double: () => context.get<int>()! * 1.0,
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},
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);
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expect(
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() => value,
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throwsA(
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isA<ContextDependencyCycleException>()
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.having((ContextDependencyCycleException error) => error.cycle, 'cycle', <Type>[String, double, int])
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.having(
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(ContextDependencyCycleException error) => error.toString(),
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'toString()',
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'Dependency cycle detected: String -> double -> int',
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),
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),
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);
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});
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});
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group('run', () {
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test('returns the value returned by body', () async {
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expect(await context.run<int>(body: () => 123), 123);
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expect(await context.run<String>(body: () => 'value'), 'value');
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expect(await context.run<int>(body: () async => 456), 456);
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});
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test('passes name to child context', () async {
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await context.run<void>(name: 'child', body: () {
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expect(context.name, 'child');
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});
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});
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group('fallbacks', () {
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late bool called;
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setUp(() {
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called = false;
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});
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test('are applied after parent context is consulted', () async {
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final String? value = await context.run<String?>(
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body: () {
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return context.run<String?>(
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body: () {
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called = true;
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return context.get<String>();
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},
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fallbacks: <Type, Generator>{
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String: () => 'child',
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},
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);
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},
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);
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expect(called, isTrue);
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expect(value, 'child');
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});
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test('are not applied if parent context supplies value', () async {
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bool childConsulted = false;
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final String? value = await context.run<String?>(
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body: () {
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return context.run<String?>(
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body: () {
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called = true;
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return context.get<String>();
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},
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fallbacks: <Type, Generator>{
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String: () {
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childConsulted = true;
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return 'child';
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},
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},
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);
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},
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fallbacks: <Type, Generator>{
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String: () => 'parent',
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},
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);
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expect(called, isTrue);
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expect(value, 'parent');
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expect(childConsulted, isFalse);
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});
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test('may depend on one another', () async {
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final String? value = await context.run<String?>(
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body: () {
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return context.get<String>();
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},
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fallbacks: <Type, Generator>{
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int: () => 123,
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String: () => '-${context.get<int>()}-',
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},
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);
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expect(value, '-123-');
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});
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});
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group('overrides', () {
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test('intercept consultation of parent context', () async {
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bool parentConsulted = false;
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final String? value = await context.run<String?>(
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body: () {
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return context.run<String?>(
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body: () => context.get<String>(),
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overrides: <Type, Generator>{
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String: () => 'child',
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},
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);
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},
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fallbacks: <Type, Generator>{
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String: () {
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parentConsulted = true;
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return 'parent';
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},
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},
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);
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expect(value, 'child');
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expect(parentConsulted, isFalse);
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});
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});
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});
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});
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}
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