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Unified Diff: test/chain_test.dart

Issue 1218903003: Add tests for stack chains in the browser. (Closed) Base URL: git@github.com:dart-lang/stack_trace@master
Patch Set: Created 5 years, 6 months ago
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Index: test/chain_test.dart
diff --git a/test/chain_test.dart b/test/chain_test.dart
deleted file mode 100644
index 65d6790f9f9d39e5ef7c4c3b68ea43b2e202c2c4..0000000000000000000000000000000000000000
--- a/test/chain_test.dart
+++ /dev/null
@@ -1,832 +0,0 @@
-// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// dart2js currently doesn't support chain-capturing. See sdk#15171.
-@TestOn('vm')
-
-import 'dart:async';
-
-import 'package:path/path.dart' as p;
-import 'package:stack_trace/stack_trace.dart';
-import 'package:test/test.dart';
-
-import 'utils.dart';
-
-void main() {
- group('capture() with onError catches exceptions', () {
- test('thrown synchronously', () {
- return captureFuture(() => throw 'error')
- .then((chain) {
- expect(chain.traces, hasLength(1));
- expect(chain.traces.single.frames.first,
- frameMember(startsWith('main')));
- });
- });
-
- test('thrown in a microtask', () {
- return captureFuture(() => inMicrotask(() => throw 'error'))
- .then((chain) {
- // Since there was only one asynchronous operation, there should be only
- // two traces in the chain.
- expect(chain.traces, hasLength(2));
-
- // The first frame of the first trace should be the line on which the
- // actual error was thrown.
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
-
- // The second trace should describe the stack when the error callback
- // was scheduled.
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('thrown in a one-shot timer', () {
- return captureFuture(() => inOneShotTimer(() => throw 'error'))
- .then((chain) {
- expect(chain.traces, hasLength(2));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inOneShotTimer'))));
- });
- });
-
- test('thrown in a periodic timer', () {
- return captureFuture(() => inPeriodicTimer(() => throw 'error'))
- .then((chain) {
- expect(chain.traces, hasLength(2));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inPeriodicTimer'))));
- });
- });
-
- test('thrown in a nested series of asynchronous operations', () {
- return captureFuture(() {
- inPeriodicTimer(() {
- inOneShotTimer(() => inMicrotask(() => throw 'error'));
- });
- }).then((chain) {
- expect(chain.traces, hasLength(4));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inOneShotTimer'))));
- expect(chain.traces[3].frames,
- contains(frameMember(startsWith('inPeriodicTimer'))));
- });
- });
-
- test('thrown in a long future chain', () {
- return captureFuture(() => inFutureChain(() => throw 'error'))
- .then((chain) {
- // Despite many asynchronous operations, there's only one level of
- // nested calls, so there should be only two traces in the chain. This
- // is important; programmers expect stack trace memory consumption to be
- // O(depth of program), not O(length of program).
- expect(chain.traces, hasLength(2));
-
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inFutureChain'))));
- });
- });
-
- test('thrown in new Future()', () {
- return captureFuture(() => inNewFuture(() => throw 'error'))
- .then((chain) {
- expect(chain.traces, hasLength(3));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
-
- // The second trace is the one captured by
- // [StackZoneSpecification.errorCallback]. Because that runs
- // asynchronously within [new Future], it doesn't actually refer to the
- // source file at all.
- expect(chain.traces[1].frames,
- everyElement(frameLibrary(isNot(contains('chain_test')))));
-
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inNewFuture'))));
- });
- });
-
- test('thrown in new Future.sync()', () {
- return captureFuture(() {
- inMicrotask(() => inSyncFuture(() => throw 'error'));
- }).then((chain) {
- expect(chain.traces, hasLength(3));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inSyncFuture'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('multiple times', () {
- var completer = new Completer();
- var first = true;
-
- Chain.capture(() {
- inMicrotask(() => throw 'first error');
- inPeriodicTimer(() => throw 'second error');
- }, onError: (error, chain) {
- try {
- if (first) {
- expect(error, equals('first error'));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- first = false;
- } else {
- expect(error, equals('second error'));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inPeriodicTimer'))));
- completer.complete();
- }
- } catch (error, stackTrace) {
- completer.completeError(error, stackTrace);
- }
- });
-
- return completer.future;
- });
-
- test('passed to a completer', () {
- var trace = new Trace.current();
- return captureFuture(() {
- inMicrotask(() => completerErrorFuture(trace));
- }).then((chain) {
- expect(chain.traces, hasLength(3));
-
- // The first trace is the trace that was manually reported for the
- // error.
- expect(chain.traces.first.toString(), equals(trace.toString()));
-
- // The second trace is the trace that was captured when
- // [Completer.addError] was called.
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('completerErrorFuture'))));
-
- // The third trace is the automatically-captured trace from when the
- // microtask was scheduled.
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('passed to a completer with no stack trace', () {
- return captureFuture(() {
- inMicrotask(() => completerErrorFuture());
- }).then((chain) {
- expect(chain.traces, hasLength(2));
-
- // The first trace is the one captured when [Completer.addError] was
- // called.
- expect(chain.traces[0].frames,
- contains(frameMember(startsWith('completerErrorFuture'))));
-
- // The second trace is the automatically-captured trace from when the
- // microtask was scheduled.
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('passed to a stream controller', () {
- var trace = new Trace.current();
- return captureFuture(() {
- inMicrotask(() => controllerErrorStream(trace).listen(null));
- }).then((chain) {
- expect(chain.traces, hasLength(3));
- expect(chain.traces.first.toString(), equals(trace.toString()));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('controllerErrorStream'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('passed to a stream controller with no stack trace', () {
- return captureFuture(() {
- inMicrotask(() => controllerErrorStream().listen(null));
- }).then((chain) {
- expect(chain.traces, hasLength(2));
- expect(chain.traces[0].frames,
- contains(frameMember(startsWith('controllerErrorStream'))));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('and relays them to the parent zone', () {
- var completer = new Completer();
-
- runZoned(() {
- Chain.capture(() {
- inMicrotask(() => throw 'error');
- }, onError: (error, chain) {
- expect(error, equals('error'));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- throw error;
- });
- }, onError: (error, chain) {
- try {
- expect(error, equals('error'));
- expect(chain, new isInstanceOf<Chain>());
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- completer.complete();
- } catch (error, stackTrace) {
- completer.completeError(error, stackTrace);
- }
- });
-
- return completer.future;
- });
- });
-
- test('capture() without onError passes exceptions to parent zone', () {
- var completer = new Completer();
-
- runZoned(() {
- Chain.capture(() => inMicrotask(() => throw 'error'));
- }, onError: (error, chain) {
- try {
- expect(error, equals('error'));
- expect(chain, new isInstanceOf<Chain>());
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- completer.complete();
- } catch (error, stackTrace) {
- completer.completeError(error, stackTrace);
- }
- });
-
- return completer.future;
- });
-
- group('current() within capture()', () {
- test('called in a microtask', () {
- var completer = new Completer();
- Chain.capture(() {
- inMicrotask(() => completer.complete(new Chain.current()));
- });
-
- return completer.future.then((chain) {
- expect(chain.traces, hasLength(2));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('called in a one-shot timer', () {
- var completer = new Completer();
- Chain.capture(() {
- inOneShotTimer(() => completer.complete(new Chain.current()));
- });
-
- return completer.future.then((chain) {
- expect(chain.traces, hasLength(2));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inOneShotTimer'))));
- });
- });
-
- test('called in a periodic timer', () {
- var completer = new Completer();
- Chain.capture(() {
- inPeriodicTimer(() => completer.complete(new Chain.current()));
- });
-
- return completer.future.then((chain) {
- expect(chain.traces, hasLength(2));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inPeriodicTimer'))));
- });
- });
-
- test('called in a nested series of asynchronous operations', () {
- var completer = new Completer();
- Chain.capture(() {
- inPeriodicTimer(() {
- inOneShotTimer(() {
- inMicrotask(() => completer.complete(new Chain.current()));
- });
- });
- });
-
- return completer.future.then((chain) {
- expect(chain.traces, hasLength(4));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inOneShotTimer'))));
- expect(chain.traces[3].frames,
- contains(frameMember(startsWith('inPeriodicTimer'))));
- });
- });
-
- test('called in a long future chain', () {
- var completer = new Completer();
- Chain.capture(() {
- inFutureChain(() => completer.complete(new Chain.current()));
- });
-
- return completer.future.then((chain) {
- expect(chain.traces, hasLength(2));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('inFutureChain'))));
- });
- });
- });
-
- test('current() outside of capture() returns a chain wrapping the current '
- 'trace', () {
- // The test runner runs all tests with chains enabled, so to test without we
- // have to do some zone munging.
- return runZoned(() {
- var completer = new Completer();
- inMicrotask(() => completer.complete(new Chain.current()));
-
- return completer.future.then((chain) {
- // Since the chain wasn't loaded within [Chain.capture], the full stack
- // chain isn't available and it just returns the current stack when
- // called.
- expect(chain.traces, hasLength(1));
- expect(chain.traces.first.frames.first,
- frameMember(startsWith('main')));
- });
- }, zoneValues: {#stack_trace.stack_zone.spec: null});
- });
-
- group('forTrace() within capture()', () {
- test('called for a stack trace from a microtask', () {
- return Chain.capture(() {
- return chainForTrace(inMicrotask, () => throw 'error');
- }).then((chain) {
- // Because [chainForTrace] has to set up a future chain to capture the
- // stack trace while still showing it to the zone specification, it adds
- // an additional level of async nesting and so an additional trace.
- expect(chain.traces, hasLength(3));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('chainForTrace'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- });
- });
-
- test('called for a stack trace from a one-shot timer', () {
- return Chain.capture(() {
- return chainForTrace(inOneShotTimer, () => throw 'error');
- }).then((chain) {
- expect(chain.traces, hasLength(3));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('chainForTrace'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inOneShotTimer'))));
- });
- });
-
- test('called for a stack trace from a periodic timer', () {
- return Chain.capture(() {
- return chainForTrace(inPeriodicTimer, () => throw 'error');
- }).then((chain) {
- expect(chain.traces, hasLength(3));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('chainForTrace'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inPeriodicTimer'))));
- });
- });
-
- test('called for a stack trace from a nested series of asynchronous '
- 'operations', () {
- return Chain.capture(() {
- return chainForTrace((callback) {
- inPeriodicTimer(() => inOneShotTimer(() => inMicrotask(callback)));
- }, () => throw 'error');
- }).then((chain) {
- expect(chain.traces, hasLength(5));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('chainForTrace'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inMicrotask'))));
- expect(chain.traces[3].frames,
- contains(frameMember(startsWith('inOneShotTimer'))));
- expect(chain.traces[4].frames,
- contains(frameMember(startsWith('inPeriodicTimer'))));
- });
- });
-
- test('called for a stack trace from a long future chain', () {
- return Chain.capture(() {
- return chainForTrace(inFutureChain, () => throw 'error');
- }).then((chain) {
- expect(chain.traces, hasLength(3));
- expect(chain.traces[0].frames.first, frameMember(startsWith('main')));
- expect(chain.traces[1].frames,
- contains(frameMember(startsWith('chainForTrace'))));
- expect(chain.traces[2].frames,
- contains(frameMember(startsWith('inFutureChain'))));
- });
- });
-
- test('called for an unregistered stack trace returns a chain wrapping that '
- 'trace', () {
- var trace;
- var chain = Chain.capture(() {
- try {
- throw 'error';
- } catch (_, stackTrace) {
- trace = stackTrace;
- return new Chain.forTrace(stackTrace);
- }
- });
-
- expect(chain.traces, hasLength(1));
- expect(chain.traces.first.toString(),
- equals(new Trace.from(trace).toString()));
- });
- });
-
- test('forTrace() outside of capture() returns a chain wrapping the given '
- 'trace', () {
- var trace;
- var chain = Chain.capture(() {
- try {
- throw 'error';
- } catch (_, stackTrace) {
- trace = stackTrace;
- return new Chain.forTrace(stackTrace);
- }
- });
-
- expect(chain.traces, hasLength(1));
- expect(chain.traces.first.toString(),
- equals(new Trace.from(trace).toString()));
- });
-
- group('Chain.parse()', () {
- test('parses a real Chain', () {
- return captureFuture(() => inMicrotask(() => throw 'error'))
- .then((chain) {
- expect(new Chain.parse(chain.toString()).toString(),
- equals(chain.toString()));
- });
- });
-
- test('parses an empty string', () {
- var chain = new Chain.parse('');
- expect(chain.traces, isEmpty);
- });
-
- test('parses a chain containing empty traces', () {
- var chain = new Chain.parse(
- '===== asynchronous gap ===========================\n'
- '===== asynchronous gap ===========================\n');
- expect(chain.traces, hasLength(3));
- expect(chain.traces[0].frames, isEmpty);
- expect(chain.traces[1].frames, isEmpty);
- expect(chain.traces[2].frames, isEmpty);
- });
- });
-
- test("toString() ensures that all traces are aligned", () {
- var chain = new Chain([
- new Trace.parse('short 10:11 Foo.bar\n'),
- new Trace.parse('loooooooooooong 10:11 Zop.zoop')
- ]);
-
- expect(chain.toString(), equals(
- 'short 10:11 Foo.bar\n'
- '===== asynchronous gap ===========================\n'
- 'loooooooooooong 10:11 Zop.zoop\n'));
- });
-
- var userSlashCode = p.join('user', 'code.dart');
- group('Chain.terse', () {
- test('makes each trace terse', () {
- var chain = new Chain([
- new Trace.parse(
- 'dart:core 10:11 Foo.bar\n'
- 'dart:core 10:11 Bar.baz\n'
- 'user/code.dart 10:11 Bang.qux\n'
- 'dart:core 10:11 Zip.zap\n'
- 'dart:core 10:11 Zop.zoop'),
- new Trace.parse(
- 'user/code.dart 10:11 Bang.qux\n'
- 'dart:core 10:11 Foo.bar\n'
- 'package:stack_trace/stack_trace.dart 10:11 Bar.baz\n'
- 'dart:core 10:11 Zip.zap\n'
- 'user/code.dart 10:11 Zop.zoop')
- ]);
-
- expect(chain.terse.toString(), equals(
- 'dart:core Bar.baz\n'
- '$userSlashCode 10:11 Bang.qux\n'
- '===== asynchronous gap ===========================\n'
- '$userSlashCode 10:11 Bang.qux\n'
- 'dart:core Zip.zap\n'
- '$userSlashCode 10:11 Zop.zoop\n'));
- });
-
- test('eliminates internal-only traces', () {
- var chain = new Chain([
- new Trace.parse(
- 'user/code.dart 10:11 Foo.bar\n'
- 'dart:core 10:11 Bar.baz'),
- new Trace.parse(
- 'dart:core 10:11 Foo.bar\n'
- 'package:stack_trace/stack_trace.dart 10:11 Bar.baz\n'
- 'dart:core 10:11 Zip.zap'),
- new Trace.parse(
- 'user/code.dart 10:11 Foo.bar\n'
- 'dart:core 10:11 Bar.baz')
- ]);
-
- expect(chain.terse.toString(), equals(
- '$userSlashCode 10:11 Foo.bar\n'
- '===== asynchronous gap ===========================\n'
- '$userSlashCode 10:11 Foo.bar\n'));
- });
-
- test("doesn't return an empty chain", () {
- var chain = new Chain([
- new Trace.parse(
- 'dart:core 10:11 Foo.bar\n'
- 'package:stack_trace/stack_trace.dart 10:11 Bar.baz\n'
- 'dart:core 10:11 Zip.zap'),
- new Trace.parse(
- 'dart:core 10:11 A.b\n'
- 'package:stack_trace/stack_trace.dart 10:11 C.d\n'
- 'dart:core 10:11 E.f')
- ]);
-
- expect(chain.terse.toString(), equals('dart:core E.f\n'));
- });
- });
-
- group('Chain.foldFrames', () {
- test('folds each trace', () {
- var chain = new Chain([
- new Trace.parse(
- 'a.dart 10:11 Foo.bar\n'
- 'a.dart 10:11 Bar.baz\n'
- 'b.dart 10:11 Bang.qux\n'
- 'a.dart 10:11 Zip.zap\n'
- 'a.dart 10:11 Zop.zoop'),
- new Trace.parse(
- 'a.dart 10:11 Foo.bar\n'
- 'a.dart 10:11 Bar.baz\n'
- 'a.dart 10:11 Bang.qux\n'
- 'a.dart 10:11 Zip.zap\n'
- 'b.dart 10:11 Zop.zoop')
- ]);
-
- var folded = chain.foldFrames((frame) => frame.library == 'a.dart');
- expect(folded.toString(), equals(
- 'a.dart 10:11 Bar.baz\n'
- 'b.dart 10:11 Bang.qux\n'
- 'a.dart 10:11 Zop.zoop\n'
- '===== asynchronous gap ===========================\n'
- 'a.dart 10:11 Zip.zap\n'
- 'b.dart 10:11 Zop.zoop\n'));
- });
-
- test('with terse: true, folds core frames as well', () {
- var chain = new Chain([
- new Trace.parse(
- 'a.dart 10:11 Foo.bar\n'
- 'dart:async-patch/future.dart 10:11 Zip.zap\n'
- 'b.dart 10:11 Bang.qux\n'
- 'dart:core 10:11 Bar.baz\n'
- 'a.dart 10:11 Zop.zoop'),
- new Trace.parse(
- 'a.dart 10:11 Foo.bar\n'
- 'a.dart 10:11 Bar.baz\n'
- 'a.dart 10:11 Bang.qux\n'
- 'a.dart 10:11 Zip.zap\n'
- 'b.dart 10:11 Zop.zoop')
- ]);
-
- var folded = chain.foldFrames((frame) => frame.library == 'a.dart',
- terse: true);
- expect(folded.toString(), equals(
- 'dart:async Zip.zap\n'
- 'b.dart 10:11 Bang.qux\n'
- 'a.dart Zop.zoop\n'
- '===== asynchronous gap ===========================\n'
- 'a.dart Zip.zap\n'
- 'b.dart 10:11 Zop.zoop\n'));
- });
-
- test('eliminates completely-folded traces', () {
- var chain = new Chain([
- new Trace.parse(
- 'a.dart 10:11 Foo.bar\n'
- 'b.dart 10:11 Bang.qux'),
- new Trace.parse(
- 'a.dart 10:11 Foo.bar\n'
- 'a.dart 10:11 Bang.qux'),
- new Trace.parse(
- 'a.dart 10:11 Zip.zap\n'
- 'b.dart 10:11 Zop.zoop')
- ]);
-
- var folded = chain.foldFrames((frame) => frame.library == 'a.dart');
- expect(folded.toString(), equals(
- 'a.dart 10:11 Foo.bar\n'
- 'b.dart 10:11 Bang.qux\n'
- '===== asynchronous gap ===========================\n'
- 'a.dart 10:11 Zip.zap\n'
- 'b.dart 10:11 Zop.zoop\n'));
- });
-
- test("doesn't return an empty trace", () {
- var chain = new Chain([
- new Trace.parse(
- 'a.dart 10:11 Foo.bar\n'
- 'a.dart 10:11 Bang.qux')
- ]);
-
- var folded = chain.foldFrames((frame) => frame.library == 'a.dart');
- expect(folded.toString(), equals('a.dart 10:11 Bang.qux\n'));
- });
- });
-
- test('Chain.toTrace eliminates asynchronous gaps', () {
- var trace = new Chain([
- new Trace.parse(
- 'user/code.dart 10:11 Foo.bar\n'
- 'dart:core 10:11 Bar.baz'),
- new Trace.parse(
- 'user/code.dart 10:11 Foo.bar\n'
- 'dart:core 10:11 Bar.baz')
- ]).toTrace();
-
- expect(trace.toString(), equals(
- '$userSlashCode 10:11 Foo.bar\n'
- 'dart:core 10:11 Bar.baz\n'
- '$userSlashCode 10:11 Foo.bar\n'
- 'dart:core 10:11 Bar.baz\n'));
- });
-
- group('Chain.track(Future)', () {
- test('forwards the future value within Chain.capture()', () {
- Chain.capture(() {
- expect(Chain.track(new Future.value('value')),
- completion(equals('value')));
-
- var trace = new Trace.current();
- expect(Chain.track(new Future.error('error', trace))
- .catchError((e, stackTrace) {
- expect(e, equals('error'));
- expect(stackTrace.toString(), equals(trace.toString()));
- }), completes);
- });
- });
-
- test('forwards the future value outside of Chain.capture()', () {
- expect(Chain.track(new Future.value('value')),
- completion(equals('value')));
-
- var trace = new Trace.current();
- expect(Chain.track(new Future.error('error', trace))
- .catchError((e, stackTrace) {
- expect(e, equals('error'));
- expect(stackTrace.toString(), equals(trace.toString()));
- }), completes);
- });
- });
-
- group('Chain.track(Stream)', () {
- test('forwards stream values within Chain.capture()', () {
- Chain.capture(() {
- var controller = new StreamController()
- ..add(1)..add(2)..add(3)..close();
- expect(Chain.track(controller.stream).toList(),
- completion(equals([1, 2, 3])));
-
- var trace = new Trace.current();
- controller = new StreamController()..addError('error', trace);
- expect(Chain.track(controller.stream).toList()
- .catchError((e, stackTrace) {
- expect(e, equals('error'));
- expect(stackTrace.toString(), equals(trace.toString()));
- }), completes);
- });
- });
-
- test('forwards stream values outside of Chain.capture()', () {
- Chain.capture(() {
- var controller = new StreamController()
- ..add(1)..add(2)..add(3)..close();
- expect(Chain.track(controller.stream).toList(),
- completion(equals([1, 2, 3])));
-
- var trace = new Trace.current();
- controller = new StreamController()..addError('error', trace);
- expect(Chain.track(controller.stream).toList()
- .catchError((e, stackTrace) {
- expect(e, equals('error'));
- expect(stackTrace.toString(), equals(trace.toString()));
- }), completes);
- });
- });
- });
-}
-
-/// Runs [callback] in a microtask callback.
-void inMicrotask(callback()) => scheduleMicrotask(callback);
-
-/// Runs [callback] in a one-shot timer callback.
-void inOneShotTimer(callback()) => Timer.run(callback);
-
-/// Runs [callback] once in a periodic timer callback.
-void inPeriodicTimer(callback()) {
- var count = 0;
- new Timer.periodic(new Duration(milliseconds: 1), (timer) {
- count++;
- if (count != 5) return;
- timer.cancel();
- callback();
- });
-}
-
-/// Runs [callback] within a long asynchronous Future chain.
-void inFutureChain(callback()) {
- new Future(() {})
- .then((_) => new Future(() {}))
- .then((_) => new Future(() {}))
- .then((_) => new Future(() {}))
- .then((_) => new Future(() {}))
- .then((_) => callback())
- .then((_) => new Future(() {}));
-}
-
-void inNewFuture(callback()) {
- new Future(callback);
-}
-
-void inSyncFuture(callback()) {
- new Future.sync(callback);
-}
-
-/// Returns a Future that completes to an error using a completer.
-///
-/// If [trace] is passed, it's used as the stack trace for the error.
-Future completerErrorFuture([StackTrace trace]) {
- var completer = new Completer();
- completer.completeError('error', trace);
- return completer.future;
-}
-
-/// Returns a Stream that emits an error using a controller.
-///
-/// If [trace] is passed, it's used as the stack trace for the error.
-Stream controllerErrorStream([StackTrace trace]) {
- var controller = new StreamController();
- controller.addError('error', trace);
- return controller.stream;
-}
-
-/// Runs [callback] within [asyncFn], then converts any errors raised into a
-/// [Chain] with [Chain.forTrace].
-Future<Chain> chainForTrace(asyncFn(callback()), callback()) {
- var completer = new Completer();
- asyncFn(() {
- // We use `new Future.value().then(...)` here as opposed to [new Future] or
- // [new Future.sync] because those methods don't pass the exception through
- // the zone specification before propagating it, so there's no chance to
- // attach a chain to its stack trace. See issue 15105.
- new Future.value().then((_) => callback())
- .catchError(completer.completeError);
- });
- return completer.future
- .catchError((_, stackTrace) => new Chain.forTrace(stackTrace));
-}
-
-/// Runs [callback] in a [Chain.capture] zone and returns a Future that
-/// completes to the stack chain for an error thrown by [callback].
-///
-/// [callback] is expected to throw the string `"error"`.
-Future<Chain> captureFuture(callback()) {
- var completer = new Completer<Chain>();
- Chain.capture(callback, onError: (error, chain) {
- expect(error, equals('error'));
- completer.complete(chain);
- });
- return completer.future;
-}
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