| // 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. |
| |
| import "dart:async"; |
| import "dart:collection"; |
| |
| import "package:async/async.dart"; |
| import "package:stack_trace/stack_trace.dart"; |
| import "package:test/test.dart"; |
| |
| void main() { |
| var stack = Trace.current(); |
| |
| test("create result value", () { |
| Result<int> result = Result<int>.value(42); |
| expect(result.isValue, isTrue); |
| expect(result.isError, isFalse); |
| ValueResult value = result.asValue; |
| expect(value.value, equals(42)); |
| }); |
| |
| test("create result value 2", () { |
| Result<int> result = ValueResult<int>(42); |
| expect(result.isValue, isTrue); |
| expect(result.isError, isFalse); |
| ValueResult<int> value = result.asValue; |
| expect(value.value, equals(42)); |
| }); |
| |
| test("create result error", () { |
| Result<bool> result = Result<bool>.error("BAD", stack); |
| expect(result.isValue, isFalse); |
| expect(result.isError, isTrue); |
| ErrorResult error = result.asError; |
| expect(error.error, equals("BAD")); |
| expect(error.stackTrace, same(stack)); |
| }); |
| |
| test("create result error 2", () { |
| Result<bool> result = ErrorResult("BAD", stack); |
| expect(result.isValue, isFalse); |
| expect(result.isError, isTrue); |
| ErrorResult error = result.asError; |
| expect(error.error, equals("BAD")); |
| expect(error.stackTrace, same(stack)); |
| }); |
| |
| test("create result error no stack", () { |
| Result<bool> result = Result<bool>.error("BAD"); |
| expect(result.isValue, isFalse); |
| expect(result.isError, isTrue); |
| ErrorResult error = result.asError; |
| expect(error.error, equals("BAD")); |
| expect(error.stackTrace, isNull); |
| }); |
| |
| test("complete with value", () { |
| Result<int> result = ValueResult<int>(42); |
| var c = Completer<int>(); |
| c.future.then(expectAsync1((int v) { |
| expect(v, equals(42)); |
| }), onError: (e, s) { |
| fail("Unexpected error"); |
| }); |
| result.complete(c); |
| }); |
| |
| test("complete with error", () { |
| Result<bool> result = ErrorResult("BAD", stack); |
| var c = Completer<bool>(); |
| c.future.then((bool v) { |
| fail("Unexpected value $v"); |
| }, onError: expectAsync2((e, s) { |
| expect(e, equals("BAD")); |
| expect(s, same(stack)); |
| })); |
| result.complete(c); |
| }); |
| |
| test("add sink value", () { |
| var result = ValueResult<int>(42); |
| EventSink<int> sink = TestSink(onData: expectAsync1((v) { |
| expect(v, equals(42)); |
| })); |
| result.addTo(sink); |
| }); |
| |
| test("add sink error", () { |
| Result<bool> result = ErrorResult("BAD", stack); |
| EventSink<bool> sink = TestSink(onError: expectAsync2((e, s) { |
| expect(e, equals("BAD")); |
| expect(s, same(stack)); |
| })); |
| result.addTo(sink); |
| }); |
| |
| test("value as future", () { |
| Result<int> result = ValueResult<int>(42); |
| result.asFuture.then(expectAsync1((int v) { |
| expect(v, equals(42)); |
| }), onError: (e, s) { |
| fail("Unexpected error"); |
| }); |
| }); |
| |
| test("error as future", () { |
| Result<bool> result = ErrorResult("BAD", stack); |
| result.asFuture.then((bool v) { |
| fail("Unexpected value $v"); |
| }, onError: expectAsync2((e, s) { |
| expect(e, equals("BAD")); |
| expect(s, same(stack)); |
| })); |
| }); |
| |
| test("capture future value", () { |
| Future<int> value = Future<int>.value(42); |
| Result.capture(value).then(expectAsync1((Result result) { |
| expect(result.isValue, isTrue); |
| expect(result.isError, isFalse); |
| ValueResult value = result.asValue; |
| expect(value.value, equals(42)); |
| }), onError: (e, s) { |
| fail("Unexpected error: $e"); |
| }); |
| }); |
| |
| test("capture future error", () { |
| Future<bool> value = Future<bool>.error("BAD", stack); |
| Result.capture(value).then(expectAsync1((Result result) { |
| expect(result.isValue, isFalse); |
| expect(result.isError, isTrue); |
| ErrorResult error = result.asError; |
| expect(error.error, equals("BAD")); |
| expect(error.stackTrace, same(stack)); |
| }), onError: (e, s) { |
| fail("Unexpected error: $e"); |
| }); |
| }); |
| |
| test("release future value", () { |
| Future<Result<int>> future = |
| Future<Result<int>>.value(Result<int>.value(42)); |
| Result.release(future).then(expectAsync1((v) { |
| expect(v, equals(42)); |
| }), onError: (e, s) { |
| fail("Unexpected error: $e"); |
| }); |
| }); |
| |
| test("release future error", () { |
| // An error in the result is unwrapped and reified by release. |
| Future<Result<bool>> future = |
| Future<Result<bool>>.value(Result<bool>.error("BAD", stack)); |
| Result.release(future).then((v) { |
| fail("Unexpected value: $v"); |
| }, onError: expectAsync2((e, s) { |
| expect(e, equals("BAD")); |
| expect(s, same(stack)); |
| })); |
| }); |
| |
| test("release future real error", () { |
| // An error in the error lane is passed through by release. |
| Future<Result<bool>> future = Future<Result<bool>>.error("BAD", stack); |
| Result.release(future).then((v) { |
| fail("Unexpected value: $v"); |
| }, onError: expectAsync2((e, s) { |
| expect(e, equals("BAD")); |
| expect(s, same(stack)); |
| })); |
| }); |
| |
| test("capture stream", () { |
| var c = StreamController<int>(); |
| var stream = Result.captureStream(c.stream); |
| var expectedList = Queue.from( |
| [Result.value(42), Result.error("BAD", stack), Result.value(37)]); |
| void listener(Result actual) { |
| expect(expectedList.isEmpty, isFalse); |
| expectResult(actual, expectedList.removeFirst()); |
| } |
| |
| stream.listen(expectAsync1(listener, count: 3), |
| onDone: expectAsync0(() {}), cancelOnError: true); |
| c.add(42); |
| c.addError("BAD", stack); |
| c.add(37); |
| c.close(); |
| }); |
| |
| test("release stream", () { |
| StreamController<Result<int>> c = StreamController<Result<int>>(); |
| Stream<int> stream = Result.releaseStream(c.stream); |
| var events = [ |
| Result<int>.value(42), |
| Result<int>.error("BAD", stack), |
| Result<int>.value(37) |
| ]; |
| // Expect the data events, and an extra error event. |
| var expectedList = Queue.from(events)..add(Result.error("BAD2", stack)); |
| |
| void dataListener(int v) { |
| expect(expectedList.isEmpty, isFalse); |
| Result expected = expectedList.removeFirst(); |
| expect(expected.isValue, isTrue); |
| expect(v, equals(expected.asValue.value)); |
| } |
| |
| void errorListener(error, StackTrace stackTrace) { |
| expect(expectedList.isEmpty, isFalse); |
| Result expected = expectedList.removeFirst(); |
| expect(expected.isError, isTrue); |
| expect(error, equals(expected.asError.error)); |
| expect(stackTrace, same(expected.asError.stackTrace)); |
| } |
| |
| stream.listen(expectAsync1(dataListener, count: 2), |
| onError: expectAsync2(errorListener, count: 2), |
| onDone: expectAsync0(() {})); |
| for (Result<int> result in events) { |
| c.add(result); // Result value or error in data line. |
| } |
| c.addError("BAD2", stack); // Error in error line. |
| c.close(); |
| }); |
| |
| test("release stream cancel on error", () { |
| StreamController<Result<int>> c = StreamController<Result<int>>(); |
| Stream<int> stream = Result.releaseStream(c.stream); |
| stream.listen(expectAsync1((v) { |
| expect(v, equals(42)); |
| }), onError: expectAsync2((e, s) { |
| expect(e, equals("BAD")); |
| expect(s, same(stack)); |
| }), onDone: () { |
| fail("Unexpected done event"); |
| }, cancelOnError: true); |
| c.add(Result.value(42)); |
| c.add(Result.error("BAD", stack)); |
| c.add(Result.value(37)); |
| c.close(); |
| }); |
| |
| test("flatten error 1", () { |
| Result<int> error = Result<int>.error("BAD", stack); |
| Result<int> flattened = |
| Result.flatten(Result<Result<int>>.error("BAD", stack)); |
| expectResult(flattened, error); |
| }); |
| |
| test("flatten error 2", () { |
| Result<int> error = Result<int>.error("BAD", stack); |
| Result<Result<int>> result = Result<Result<int>>.value(error); |
| Result<int> flattened = Result.flatten(result); |
| expectResult(flattened, error); |
| }); |
| |
| test("flatten value", () { |
| Result<Result<int>> result = |
| Result<Result<int>>.value(Result<int>.value(42)); |
| expectResult(Result.flatten(result), Result<int>.value(42)); |
| }); |
| |
| test("handle unary", () { |
| ErrorResult result = Result.error("error", stack); |
| bool called = false; |
| result.handle((error) { |
| called = true; |
| expect(error, "error"); |
| }); |
| expect(called, isTrue); |
| }); |
| |
| test("handle binary", () { |
| ErrorResult result = Result.error("error", stack); |
| bool called = false; |
| result.handle((error, stackTrace) { |
| called = true; |
| expect(error, "error"); |
| expect(stackTrace, same(stack)); |
| }); |
| expect(called, isTrue); |
| }); |
| |
| test("handle unary and binary", () { |
| ErrorResult result = Result.error("error", stack); |
| bool called = false; |
| result.handle((error, [stackTrace]) { |
| called = true; |
| expect(error, "error"); |
| expect(stackTrace, same(stack)); |
| }); |
| expect(called, isTrue); |
| }); |
| |
| test("handle neither unary nor binary", () { |
| ErrorResult result = Result.error("error", stack); |
| expect(() => result.handle(() => fail("unreachable")), throwsA(anything)); |
| expect(() => result.handle((a, b, c) => fail("unreachable")), |
| throwsA(anything)); |
| expect(() => result.handle((a, b, {c}) => fail("unreachable")), |
| throwsA(anything)); |
| expect(() => result.handle((a, {b}) => fail("unreachable")), |
| throwsA(anything)); |
| expect(() => result.handle(({a, b}) => fail("unreachable")), |
| throwsA(anything)); |
| expect( |
| () => result.handle(({a}) => fail("unreachable")), throwsA(anything)); |
| }); |
| } |
| |
| void expectResult(Result actual, Result expected) { |
| expect(actual.isValue, equals(expected.isValue)); |
| expect(actual.isError, equals(expected.isError)); |
| if (actual.isValue) { |
| expect(actual.asValue.value, equals(expected.asValue.value)); |
| } else { |
| expect(actual.asError.error, equals(expected.asError.error)); |
| expect(actual.asError.stackTrace, same(expected.asError.stackTrace)); |
| } |
| } |
| |
| class TestSink<T> implements EventSink<T> { |
| final Function onData; |
| final Function onError; |
| final Function onDone; |
| |
| TestSink( |
| {void this.onData(T data) = _nullData, |
| void this.onError(e, StackTrace s) = _nullError, |
| void this.onDone() = _nullDone}); |
| |
| void add(T value) { |
| onData(value); |
| } |
| |
| void addError(error, [StackTrace stack]) { |
| onError(error, stack); |
| } |
| |
| void close() { |
| onDone(); |
| } |
| |
| static void _nullData(value) { |
| fail("Unexpected sink add: $value"); |
| } |
| |
| static void _nullError(e, StackTrace s) { |
| fail("Unexpected sink addError: $e"); |
| } |
| |
| static void _nullDone() { |
| fail("Unepxected sink close"); |
| } |
| } |