packages/flutter_tools/test/version_test.dart - mirrors/flutter - Git at Google

 // Copyright 2017 The Chromium 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:convert';

 import 'package:collection/collection.dart' show ListEquality;
 import 'package:mockito/mockito.dart';
 import 'package:process/process.dart';
 import 'package:quiver/time.dart';
 import 'package:test/test.dart';

 import 'package:flutter_tools/src/base/context.dart';
 import 'package:flutter_tools/src/base/io.dart';
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/version.dart';

 import 'src/context.dart';

 final Clock _testClock = new Clock.fixed(new DateTime(2015, 1, 1));
 final DateTime _upToDateVersion = _testClock.agoBy(FlutterVersion.kVersionAgeConsideredUpToDate ~/ 2);
 final DateTime _outOfDateVersion = _testClock.agoBy(FlutterVersion.kVersionAgeConsideredUpToDate * 2);
 final DateTime _stampUpToDate = _testClock.agoBy(FlutterVersion.kCheckAgeConsideredUpToDate ~/ 2);
 final DateTime _stampOutOfDate = _testClock.agoBy(FlutterVersion.kCheckAgeConsideredUpToDate * 2);

 void main() {
   MockProcessManager mockProcessManager;
   MockCache mockCache;

   setUp(() {
     mockProcessManager = new MockProcessManager();
     mockCache = new MockCache();

     when(mockProcessManager.runSync(
       <String>['git', 'rev-parse', '--abbrev-ref', '--symbolic', '@{u}'],
       workingDirectory: any,
       environment: any,
     )).thenReturn(new ProcessResult(101, 0, 'channel', ''));
     when(mockProcessManager.runSync(
       <String>['git', 'rev-parse', '--abbrev-ref', 'HEAD'],
       workingDirectory: any,
       environment: any,
     )).thenReturn(new ProcessResult(102, 0, 'branch', ''));
     when(mockProcessManager.runSync(
       <String>['git', 'log', '-n', '1', '--pretty=format:%H'],
       workingDirectory: any,
       environment: any,
     )).thenReturn(new ProcessResult(103, 0, '1234abcd', ''));
     when(mockProcessManager.runSync(
       <String>['git', 'log', '-n', '1', '--pretty=format:%ar'],
       workingDirectory: any,
       environment: any,
     )).thenReturn(new ProcessResult(104, 0, '1 second ago', ''));
     when(mockProcessManager.runSync(
       <String>['git', 'describe', '--match', 'v*.*.*', '--first-parent', '--long', '--tags'],
       workingDirectory: any,
       environment: any,
     )).thenReturn(new ProcessResult(105, 0, 'v0.1.2-3-1234abcd', ''));
   });

   group('$FlutterVersion', () {
     setUpAll(() {
       Cache.disableLocking();
       FlutterVersion.kPauseToLetUserReadTheMessage = Duration.zero;
     });

     testUsingContext('prints nothing when Flutter installation looks fresh', () async {
       fakeData(mockProcessManager, mockCache, localCommitDate: _upToDateVersion);
       await FlutterVersion.instance.checkFlutterVersionFreshness();
       _expectVersionMessage('');
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('prints nothing when Flutter installation looks out-of-date by is actually up-to-date', () async {
       final FlutterVersion version = FlutterVersion.instance;

       fakeData(
         mockProcessManager,
         mockCache,
         localCommitDate: _outOfDateVersion,
         stamp: new VersionCheckStamp(
           lastTimeVersionWasChecked: _stampOutOfDate,
           lastKnownRemoteVersion: _outOfDateVersion,
         ),
         remoteCommitDate: _outOfDateVersion,
         expectSetStamp: true,
         expectServerPing: true,
       );

       await version.checkFlutterVersionFreshness();
       _expectVersionMessage('');
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('does not ping server when version stamp is up-to-date', () async {
       final FlutterVersion version = FlutterVersion.instance;

       fakeData(
         mockProcessManager,
         mockCache,
         localCommitDate: _outOfDateVersion,
         stamp: new VersionCheckStamp(
           lastTimeVersionWasChecked: _stampUpToDate,
           lastKnownRemoteVersion: _upToDateVersion,
         ),
         expectSetStamp: true,
       );

       await version.checkFlutterVersionFreshness();
       _expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('does not print warning if printed recently', () async {
       final FlutterVersion version = FlutterVersion.instance;

       fakeData(
         mockProcessManager,
         mockCache,
         localCommitDate: _outOfDateVersion,
         stamp: new VersionCheckStamp(
             lastTimeVersionWasChecked: _stampUpToDate,
             lastKnownRemoteVersion: _upToDateVersion,
         ),
         expectSetStamp: true,
       );

       await version.checkFlutterVersionFreshness();
       _expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));
       expect((await VersionCheckStamp.load()).lastTimeWarningWasPrinted, _testClock.now());

       await version.checkFlutterVersionFreshness();
       _expectVersionMessage('');
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('pings server when version stamp is missing then does not', () async {
       final FlutterVersion version = FlutterVersion.instance;

       fakeData(
         mockProcessManager,
         mockCache,
         localCommitDate: _outOfDateVersion,
         remoteCommitDate: _upToDateVersion,
         expectSetStamp: true,
         expectServerPing: true,
       );

       await version.checkFlutterVersionFreshness();
       _expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));

       // Immediate subsequent check is not expected to ping the server.
       fakeData(
         mockProcessManager,
         mockCache,
         localCommitDate: _outOfDateVersion,
         stamp: await VersionCheckStamp.load(),
       );
       await version.checkFlutterVersionFreshness();
       _expectVersionMessage('');
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('pings server when version stamp is out-of-date', () async {
       final FlutterVersion version = FlutterVersion.instance;

       fakeData(
         mockProcessManager,
         mockCache,
         localCommitDate: _outOfDateVersion,
         stamp: new VersionCheckStamp(
             lastTimeVersionWasChecked: _stampOutOfDate,
             lastKnownRemoteVersion: _testClock.ago(days: 2),
         ),
         remoteCommitDate: _upToDateVersion,
         expectSetStamp: true,
         expectServerPing: true,
       );

       await version.checkFlutterVersionFreshness();
       _expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('ignores network issues', () async {
       final FlutterVersion version = FlutterVersion.instance;

       fakeData(
         mockProcessManager,
         mockCache,
         localCommitDate: _outOfDateVersion,
         errorOnFetch: true,
         expectServerPing: true,
       );

       await version.checkFlutterVersionFreshness();
       _expectVersionMessage('');
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('versions comparison', () async {
       when(mockProcessManager.runSync(
         <String>['git', 'merge-base', '--is-ancestor', 'abcdef', '123456'],
         workingDirectory: any,
       )).thenReturn(new ProcessResult(1, 0, '', ''));

       expect(
         FlutterVersion.instance.checkRevisionAncestry(
           tentativeDescendantRevision: '123456',
           tentativeAncestorRevision: 'abcdef',
         ),
         true
       );

       verify(mockProcessManager.runSync(
         <String>['git', 'merge-base', '--is-ancestor', 'abcdef', '123456'],
         workingDirectory: any,
       ));
     },
     overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
     });
   });

   group('$VersionCheckStamp', () {
     void _expectDefault(VersionCheckStamp stamp) {
       expect(stamp.lastKnownRemoteVersion, isNull);
       expect(stamp.lastTimeVersionWasChecked, isNull);
       expect(stamp.lastTimeWarningWasPrinted, isNull);
     }

     testUsingContext('loads blank when stamp file missing', () async {
       fakeData(mockProcessManager, mockCache);
       _expectDefault(await VersionCheckStamp.load());
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('loads blank when stamp file is malformed JSON', () async {
       fakeData(mockProcessManager, mockCache, stampJson: '<');
       _expectDefault(await VersionCheckStamp.load());
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('loads blank when stamp file is well-formed but invalid JSON', () async {
       fakeData(mockProcessManager, mockCache, stampJson: '[]');
       _expectDefault(await VersionCheckStamp.load());
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('loads valid JSON', () async {
       fakeData(mockProcessManager, mockCache, stampJson: '''
       {
         "lastKnownRemoteVersion": "${_testClock.ago(days: 1)}",
         "lastTimeVersionWasChecked": "${_testClock.ago(days: 2)}",
         "lastTimeWarningWasPrinted": "${_testClock.now()}"
       }
       ''');

       final VersionCheckStamp stamp = await VersionCheckStamp.load();
       expect(stamp.lastKnownRemoteVersion, _testClock.ago(days: 1));
       expect(stamp.lastTimeVersionWasChecked, _testClock.ago(days: 2));
       expect(stamp.lastTimeWarningWasPrinted, _testClock.now());
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('stores version stamp', () async {
       fakeData(mockProcessManager, mockCache, expectSetStamp: true);

       _expectDefault(await VersionCheckStamp.load());

       final VersionCheckStamp stamp = new VersionCheckStamp(
         lastKnownRemoteVersion: _testClock.ago(days: 1),
         lastTimeVersionWasChecked: _testClock.ago(days: 2),
         lastTimeWarningWasPrinted: _testClock.now(),
       );
       await stamp.store();

       final VersionCheckStamp storedStamp = await VersionCheckStamp.load();
       expect(storedStamp.lastKnownRemoteVersion, _testClock.ago(days: 1));
       expect(storedStamp.lastTimeVersionWasChecked, _testClock.ago(days: 2));
       expect(storedStamp.lastTimeWarningWasPrinted, _testClock.now());
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });

     testUsingContext('overwrites individual fields', () async {
       fakeData(mockProcessManager, mockCache, expectSetStamp: true);

       _expectDefault(await VersionCheckStamp.load());

       final VersionCheckStamp stamp = new VersionCheckStamp(
         lastKnownRemoteVersion: _testClock.ago(days: 10),
         lastTimeVersionWasChecked: _testClock.ago(days: 9),
         lastTimeWarningWasPrinted: _testClock.ago(days: 8),
       );
       await stamp.store(
         newKnownRemoteVersion: _testClock.ago(days: 1),
         newTimeVersionWasChecked: _testClock.ago(days: 2),
         newTimeWarningWasPrinted: _testClock.now(),
       );

       final VersionCheckStamp storedStamp = await VersionCheckStamp.load();
       expect(storedStamp.lastKnownRemoteVersion, _testClock.ago(days: 1));
       expect(storedStamp.lastTimeVersionWasChecked, _testClock.ago(days: 2));
       expect(storedStamp.lastTimeWarningWasPrinted, _testClock.now());
     }, overrides: <Type, Generator>{
       FlutterVersion: () => new FlutterVersion(_testClock),
       ProcessManager: () => mockProcessManager,
       Cache: () => mockCache,
     });
   });
 }

 void _expectVersionMessage(String message) {
   final BufferLogger logger = context[Logger];
   expect(logger.statusText.trim(), message.trim());
   logger.clear();
 }

 void fakeData(
   ProcessManager pm,
   Cache cache, {
   DateTime localCommitDate,
   DateTime remoteCommitDate,
   VersionCheckStamp stamp,
   String stampJson,
   bool errorOnFetch: false,
   bool expectSetStamp: false,
   bool expectServerPing: false,
 }) {
   ProcessResult success(String standardOutput) {
     return new ProcessResult(1, 0, standardOutput, '');
   }

   ProcessResult failure(int exitCode) {
     return new ProcessResult(1, exitCode, '', 'error');
   }

   when(cache.getStampFor(any)).thenAnswer((Invocation invocation) {
     expect(invocation.positionalArguments.single, VersionCheckStamp.kFlutterVersionCheckStampFile);

     if (stampJson != null)
       return stampJson;

     if (stamp != null)
       return json.encode(stamp.toJson());

     return null;
   });

   when(cache.setStampFor(any, any)).thenAnswer((Invocation invocation) {
     expect(invocation.positionalArguments.first, VersionCheckStamp.kFlutterVersionCheckStampFile);

     if (expectSetStamp) {
       stamp = VersionCheckStamp.fromJson(json.decode(invocation.positionalArguments[1]));
       return null;
     }

     throw new StateError('Unexpected call to Cache.setStampFor(${invocation.positionalArguments}, ${invocation.namedArguments})');
   });

   final Answering<ProcessResult> syncAnswer = (Invocation invocation) {
     bool argsAre(String a1, [String a2, String a3, String a4, String a5, String a6, String a7, String a8]) {
       const ListEquality<String> equality = const ListEquality<String>();
       final List<String> args = invocation.positionalArguments.single;
       final List<String> expectedArgs =
       <String>[a1, a2, a3, a4, a5, a6, a7, a8]
           .where((String arg) => arg != null)
           .toList();
       return equality.equals(args, expectedArgs);
     }

     if (argsAre('git', 'log', '-n', '1', '--pretty=format:%ad', '--date=iso')) {
       return success(localCommitDate.toString());
     } else if (argsAre('git', 'remote')) {
       return success('');
     } else if (argsAre('git', 'remote', 'add', '__flutter_version_check__', 'https://github.com/flutter/flutter.git')) {
       return success('');
     } else if (argsAre('git', 'fetch', '__flutter_version_check__', 'master')) {
       if (!expectServerPing)
         fail('Did not expect server ping');
       return errorOnFetch ? failure(128) : success('');
     } else if (remoteCommitDate != null && argsAre('git', 'log', '__flutter_version_check__/master', '-n', '1', '--pretty=format:%ad', '--date=iso')) {
       return success(remoteCommitDate.toString());
     }

     throw new StateError('Unexpected call to ProcessManager.run(${invocation.positionalArguments}, ${invocation.namedArguments})');
   };

   when(pm.runSync(any, workingDirectory: any)).thenAnswer(syncAnswer);
   when(pm.run(any, workingDirectory: any)).thenAnswer((Invocation invocation) async {
     return syncAnswer(invocation);
   });
 }

 class MockProcessManager extends Mock implements ProcessManager {}
 class MockCache extends Mock implements Cache {}
	// Copyright 2017 The Chromium 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:convert';

	import 'package:collection/collection.dart' show ListEquality;
	import 'package:mockito/mockito.dart';
	import 'package:process/process.dart';
	import 'package:quiver/time.dart';
	import 'package:test/test.dart';

	import 'package:flutter_tools/src/base/context.dart';
	import 'package:flutter_tools/src/base/io.dart';
	import 'package:flutter_tools/src/base/logger.dart';
	import 'package:flutter_tools/src/cache.dart';
	import 'package:flutter_tools/src/version.dart';

	import 'src/context.dart';

	final Clock _testClock = new Clock.fixed(new DateTime(2015, 1, 1));
	final DateTime _upToDateVersion = _testClock.agoBy(FlutterVersion.kVersionAgeConsideredUpToDate ~/ 2);
	final DateTime _outOfDateVersion = _testClock.agoBy(FlutterVersion.kVersionAgeConsideredUpToDate * 2);
	final DateTime _stampUpToDate = _testClock.agoBy(FlutterVersion.kCheckAgeConsideredUpToDate ~/ 2);
	final DateTime _stampOutOfDate = _testClock.agoBy(FlutterVersion.kCheckAgeConsideredUpToDate * 2);

	void main() {
	MockProcessManager mockProcessManager;
	MockCache mockCache;

	setUp(() {
	mockProcessManager = new MockProcessManager();
	mockCache = new MockCache();

	when(mockProcessManager.runSync(
	<String>['git', 'rev-parse', '--abbrev-ref', '--symbolic', '@{u}'],
	workingDirectory: any,
	environment: any,
	)).thenReturn(new ProcessResult(101, 0, 'channel', ''));
	when(mockProcessManager.runSync(
	<String>['git', 'rev-parse', '--abbrev-ref', 'HEAD'],
	workingDirectory: any,
	environment: any,
	)).thenReturn(new ProcessResult(102, 0, 'branch', ''));
	when(mockProcessManager.runSync(
	<String>['git', 'log', '-n', '1', '--pretty=format:%H'],
	workingDirectory: any,
	environment: any,
	)).thenReturn(new ProcessResult(103, 0, '1234abcd', ''));
	when(mockProcessManager.runSync(
	<String>['git', 'log', '-n', '1', '--pretty=format:%ar'],
	workingDirectory: any,
	environment: any,
	)).thenReturn(new ProcessResult(104, 0, '1 second ago', ''));
	when(mockProcessManager.runSync(
	<String>['git', 'describe', '--match', 'v..*', '--first-parent', '--long', '--tags'],
	workingDirectory: any,
	environment: any,
	)).thenReturn(new ProcessResult(105, 0, 'v0.1.2-3-1234abcd', ''));
	});

	group('$FlutterVersion', () {
	setUpAll(() {
	Cache.disableLocking();
	FlutterVersion.kPauseToLetUserReadTheMessage = Duration.zero;
	});

	testUsingContext('prints nothing when Flutter installation looks fresh', () async {
	fakeData(mockProcessManager, mockCache, localCommitDate: _upToDateVersion);
	await FlutterVersion.instance.checkFlutterVersionFreshness();
	_expectVersionMessage('');
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('prints nothing when Flutter installation looks out-of-date by is actually up-to-date', () async {
	final FlutterVersion version = FlutterVersion.instance;

	fakeData(
	mockProcessManager,
	mockCache,
	localCommitDate: _outOfDateVersion,
	stamp: new VersionCheckStamp(
	lastTimeVersionWasChecked: _stampOutOfDate,
	lastKnownRemoteVersion: _outOfDateVersion,
	),
	remoteCommitDate: _outOfDateVersion,
	expectSetStamp: true,
	expectServerPing: true,
	);

	await version.checkFlutterVersionFreshness();
	_expectVersionMessage('');
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('does not ping server when version stamp is up-to-date', () async {
	final FlutterVersion version = FlutterVersion.instance;

	fakeData(
	mockProcessManager,
	mockCache,
	localCommitDate: _outOfDateVersion,
	stamp: new VersionCheckStamp(
	lastTimeVersionWasChecked: _stampUpToDate,
	lastKnownRemoteVersion: _upToDateVersion,
	),
	expectSetStamp: true,
	);

	await version.checkFlutterVersionFreshness();
	_expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('does not print warning if printed recently', () async {
	final FlutterVersion version = FlutterVersion.instance;

	fakeData(
	mockProcessManager,
	mockCache,
	localCommitDate: _outOfDateVersion,
	stamp: new VersionCheckStamp(
	lastTimeVersionWasChecked: _stampUpToDate,
	lastKnownRemoteVersion: _upToDateVersion,
	),
	expectSetStamp: true,
	);

	await version.checkFlutterVersionFreshness();
	_expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));
	expect((await VersionCheckStamp.load()).lastTimeWarningWasPrinted, _testClock.now());

	await version.checkFlutterVersionFreshness();
	_expectVersionMessage('');
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('pings server when version stamp is missing then does not', () async {
	final FlutterVersion version = FlutterVersion.instance;

	fakeData(
	mockProcessManager,
	mockCache,
	localCommitDate: _outOfDateVersion,
	remoteCommitDate: _upToDateVersion,
	expectSetStamp: true,
	expectServerPing: true,
	);

	await version.checkFlutterVersionFreshness();
	_expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));

	// Immediate subsequent check is not expected to ping the server.
	fakeData(
	mockProcessManager,
	mockCache,
	localCommitDate: _outOfDateVersion,
	stamp: await VersionCheckStamp.load(),
	);
	await version.checkFlutterVersionFreshness();
	_expectVersionMessage('');
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('pings server when version stamp is out-of-date', () async {
	final FlutterVersion version = FlutterVersion.instance;

	fakeData(
	mockProcessManager,
	mockCache,
	localCommitDate: _outOfDateVersion,
	stamp: new VersionCheckStamp(
	lastTimeVersionWasChecked: _stampOutOfDate,
	lastKnownRemoteVersion: _testClock.ago(days: 2),
	),
	remoteCommitDate: _upToDateVersion,
	expectSetStamp: true,
	expectServerPing: true,
	);

	await version.checkFlutterVersionFreshness();
	_expectVersionMessage(FlutterVersion.versionOutOfDateMessage(_testClock.now().difference(_outOfDateVersion)));
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('ignores network issues', () async {
	final FlutterVersion version = FlutterVersion.instance;

	fakeData(
	mockProcessManager,
	mockCache,
	localCommitDate: _outOfDateVersion,
	errorOnFetch: true,
	expectServerPing: true,
	);

	await version.checkFlutterVersionFreshness();
	_expectVersionMessage('');
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('versions comparison', () async {
	when(mockProcessManager.runSync(
	<String>['git', 'merge-base', '--is-ancestor', 'abcdef', '123456'],
	workingDirectory: any,
	)).thenReturn(new ProcessResult(1, 0, '', ''));

	expect(
	FlutterVersion.instance.checkRevisionAncestry(
	tentativeDescendantRevision: '123456',
	tentativeAncestorRevision: 'abcdef',
	),
	true
	);

	verify(mockProcessManager.runSync(
	<String>['git', 'merge-base', '--is-ancestor', 'abcdef', '123456'],
	workingDirectory: any,
	));
	},
	overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	});
	});

	group('$VersionCheckStamp', () {
	void _expectDefault(VersionCheckStamp stamp) {
	expect(stamp.lastKnownRemoteVersion, isNull);
	expect(stamp.lastTimeVersionWasChecked, isNull);
	expect(stamp.lastTimeWarningWasPrinted, isNull);
	}

	testUsingContext('loads blank when stamp file missing', () async {
	fakeData(mockProcessManager, mockCache);
	_expectDefault(await VersionCheckStamp.load());
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('loads blank when stamp file is malformed JSON', () async {
	fakeData(mockProcessManager, mockCache, stampJson: '<');
	_expectDefault(await VersionCheckStamp.load());
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('loads blank when stamp file is well-formed but invalid JSON', () async {
	fakeData(mockProcessManager, mockCache, stampJson: '[]');
	_expectDefault(await VersionCheckStamp.load());
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('loads valid JSON', () async {
	fakeData(mockProcessManager, mockCache, stampJson: '''
	{
	"lastKnownRemoteVersion": "${_testClock.ago(days: 1)}",
	"lastTimeVersionWasChecked": "${_testClock.ago(days: 2)}",
	"lastTimeWarningWasPrinted": "${_testClock.now()}"
	}
	''');

	final VersionCheckStamp stamp = await VersionCheckStamp.load();
	expect(stamp.lastKnownRemoteVersion, _testClock.ago(days: 1));
	expect(stamp.lastTimeVersionWasChecked, _testClock.ago(days: 2));
	expect(stamp.lastTimeWarningWasPrinted, _testClock.now());
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('stores version stamp', () async {
	fakeData(mockProcessManager, mockCache, expectSetStamp: true);

	_expectDefault(await VersionCheckStamp.load());

	final VersionCheckStamp stamp = new VersionCheckStamp(
	lastKnownRemoteVersion: _testClock.ago(days: 1),
	lastTimeVersionWasChecked: _testClock.ago(days: 2),
	lastTimeWarningWasPrinted: _testClock.now(),
	);
	await stamp.store();

	final VersionCheckStamp storedStamp = await VersionCheckStamp.load();
	expect(storedStamp.lastKnownRemoteVersion, _testClock.ago(days: 1));
	expect(storedStamp.lastTimeVersionWasChecked, _testClock.ago(days: 2));
	expect(storedStamp.lastTimeWarningWasPrinted, _testClock.now());
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});

	testUsingContext('overwrites individual fields', () async {
	fakeData(mockProcessManager, mockCache, expectSetStamp: true);

	_expectDefault(await VersionCheckStamp.load());

	final VersionCheckStamp stamp = new VersionCheckStamp(
	lastKnownRemoteVersion: _testClock.ago(days: 10),
	lastTimeVersionWasChecked: _testClock.ago(days: 9),
	lastTimeWarningWasPrinted: _testClock.ago(days: 8),
	);
	await stamp.store(
	newKnownRemoteVersion: _testClock.ago(days: 1),
	newTimeVersionWasChecked: _testClock.ago(days: 2),
	newTimeWarningWasPrinted: _testClock.now(),
	);

	final VersionCheckStamp storedStamp = await VersionCheckStamp.load();
	expect(storedStamp.lastKnownRemoteVersion, _testClock.ago(days: 1));
	expect(storedStamp.lastTimeVersionWasChecked, _testClock.ago(days: 2));
	expect(storedStamp.lastTimeWarningWasPrinted, _testClock.now());
	}, overrides: <Type, Generator>{
	FlutterVersion: () => new FlutterVersion(_testClock),
	ProcessManager: () => mockProcessManager,
	Cache: () => mockCache,
	});
	});
	}

	void _expectVersionMessage(String message) {
	final BufferLogger logger = context[Logger];
	expect(logger.statusText.trim(), message.trim());
	logger.clear();
	}

	void fakeData(
	ProcessManager pm,
	Cache cache, {
	DateTime localCommitDate,
	DateTime remoteCommitDate,
	VersionCheckStamp stamp,
	String stampJson,
	bool errorOnFetch: false,
	bool expectSetStamp: false,
	bool expectServerPing: false,
	}) {
	ProcessResult success(String standardOutput) {
	return new ProcessResult(1, 0, standardOutput, '');
	}

	ProcessResult failure(int exitCode) {
	return new ProcessResult(1, exitCode, '', 'error');
	}

	when(cache.getStampFor(any)).thenAnswer((Invocation invocation) {
	expect(invocation.positionalArguments.single, VersionCheckStamp.kFlutterVersionCheckStampFile);

	if (stampJson != null)
	return stampJson;

	if (stamp != null)
	return json.encode(stamp.toJson());

	return null;
	});

	when(cache.setStampFor(any, any)).thenAnswer((Invocation invocation) {
	expect(invocation.positionalArguments.first, VersionCheckStamp.kFlutterVersionCheckStampFile);

	if (expectSetStamp) {
	stamp = VersionCheckStamp.fromJson(json.decode(invocation.positionalArguments[1]));
	return null;
	}

	throw new StateError('Unexpected call to Cache.setStampFor(${invocation.positionalArguments}, ${invocation.namedArguments})');
	});

	final Answering<ProcessResult> syncAnswer = (Invocation invocation) {
	bool argsAre(String a1, [String a2, String a3, String a4, String a5, String a6, String a7, String a8]) {
	const ListEquality<String> equality = const ListEquality<String>();
	final List<String> args = invocation.positionalArguments.single;
	final List<String> expectedArgs =
	<String>[a1, a2, a3, a4, a5, a6, a7, a8]
	.where((String arg) => arg != null)
	.toList();
	return equality.equals(args, expectedArgs);
	}

	if (argsAre('git', 'log', '-n', '1', '--pretty=format:%ad', '--date=iso')) {
	return success(localCommitDate.toString());
	} else if (argsAre('git', 'remote')) {
	return success('');
	} else if (argsAre('git', 'remote', 'add', '__flutter_version_check__', 'https://github.com/flutter/flutter.git')) {
	return success('');
	} else if (argsAre('git', 'fetch', '__flutter_version_check__', 'master')) {
	if (!expectServerPing)
	fail('Did not expect server ping');
	return errorOnFetch ? failure(128) : success('');
	} else if (remoteCommitDate != null && argsAre('git', 'log', '__flutter_version_check__/master', '-n', '1', '--pretty=format:%ad', '--date=iso')) {
	return success(remoteCommitDate.toString());
	}

	throw new StateError('Unexpected call to ProcessManager.run(${invocation.positionalArguments}, ${invocation.namedArguments})');
	};

	when(pm.runSync(any, workingDirectory: any)).thenAnswer(syncAnswer);
	when(pm.run(any, workingDirectory: any)).thenAnswer((Invocation invocation) async {
	return syncAnswer(invocation);
	});
	}

	class MockProcessManager extends Mock implements ProcessManager {}
	class MockCache extends Mock implements Cache {}