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| 1 | +// |
| 2 | +// MultipleTasksTests.swift |
| 3 | +// SwiftTask |
| 4 | +// |
| 5 | +// Created by Yasuhiro Inami on 2016-05-07. |
| 6 | +// Copyright © 2016 Yasuhiro Inami. All rights reserved. |
| 7 | +// |
| 8 | + |
| 9 | +import SwiftTask |
| 10 | +import XCTest |
| 11 | + |
| 12 | +/// Generic type for value/error to demonstrate multiple tasks working on different types. |
| 13 | +private enum MyEnum<T> { case Default } |
| 14 | + |
| 15 | +private typealias Value1 = MyEnum<()> |
| 16 | +private typealias Error1 = MyEnum<Bool> |
| 17 | +private typealias Value2 = MyEnum<Float> |
| 18 | +private typealias Error2 = MyEnum<Double> |
| 19 | +private typealias Value3 = MyEnum<Int> |
| 20 | +private typealias Error3 = MyEnum<String> |
| 21 | + |
| 22 | +/// Wrapped error type to unify `Error1`/`Error2`/`Error3`. |
| 23 | +private enum WrappedError |
| 24 | +{ |
| 25 | + case ByTask1(Error1) |
| 26 | + case ByTask2(Error2) |
| 27 | + case ByTask3(Error3) |
| 28 | + |
| 29 | + /// For external cancellation -> internal rejection conversion. |
| 30 | + case Cancelled |
| 31 | +} |
| 32 | + |
| 33 | +class MultipleTasksTests: _TestCase |
| 34 | +{ |
| 35 | + func testMultipleTasksTests_success1_success2_success3() |
| 36 | + { |
| 37 | + let expect = self.expectationWithDescription(#function) |
| 38 | + |
| 39 | + var flow = [Int]() |
| 40 | + |
| 41 | + let task1 = { Task<(), Value1, Error1>(value: .Default).on(success: { _ in flow.append(1) }) } |
| 42 | + let task2 = { Task<(), Value2, Error2>(value: .Default).on(success: { _ in flow.append(2) }) } |
| 43 | + let task3 = { Task<(), Value3, Error3>(value: .Default).on(success: { _ in flow.append(3) }) } |
| 44 | + |
| 45 | + task1()._mapError(WrappedError.ByTask1) |
| 46 | + .success { _ in |
| 47 | + task2()._mapError(WrappedError.ByTask2) |
| 48 | + } |
| 49 | + .success { _ in |
| 50 | + task3()._mapError(WrappedError.ByTask3) |
| 51 | + } |
| 52 | + .on(success: { _ in |
| 53 | + XCTAssertEqual(flow, [1, 2, 3]) |
| 54 | + expect.fulfill() |
| 55 | + }) |
| 56 | + |
| 57 | + self.wait() |
| 58 | + } |
| 59 | + |
| 60 | + func testMultipleTasksTests_success1_success2_failure3() |
| 61 | + { |
| 62 | + let expect = self.expectationWithDescription(#function) |
| 63 | + |
| 64 | + var flow = [Int]() |
| 65 | + |
| 66 | + let task1 = { Task<(), Value1, Error1>(value: .Default).on(success: { _ in flow.append(1) }) } |
| 67 | + let task2 = { Task<(), Value2, Error2>(value: .Default).on(success: { _ in flow.append(2) }) } |
| 68 | + let task3 = { Task<(), Value3, Error3>(error: .Default).on(success: { _ in flow.append(3) }) } |
| 69 | + |
| 70 | + task1()._mapError(WrappedError.ByTask1) |
| 71 | + .success { _ in |
| 72 | + task2()._mapError(WrappedError.ByTask2) |
| 73 | + } |
| 74 | + .success { _ in |
| 75 | + task3()._mapError(WrappedError.ByTask3) |
| 76 | + } |
| 77 | + .on(failure: { error, isCancelled in |
| 78 | + guard case let .Some(.ByTask3(error3)) = error else { |
| 79 | + XCTFail("Wrong WrappedError.") |
| 80 | + return |
| 81 | + } |
| 82 | + XCTAssertEqual(error3, Error3.Default) |
| 83 | + XCTAssertEqual(flow, [1, 2]) |
| 84 | + expect.fulfill() |
| 85 | + }) |
| 86 | + |
| 87 | + self.wait() |
| 88 | + } |
| 89 | + |
| 90 | + func testMultipleTasksTests_success1_failure2_success3() |
| 91 | + { |
| 92 | + let expect = self.expectationWithDescription(#function) |
| 93 | + |
| 94 | + var flow = [Int]() |
| 95 | + |
| 96 | + let task1 = { Task<(), Value1, Error1>(value: .Default).on(success: { _ in flow.append(1) }) } |
| 97 | + let task2 = { Task<(), Value2, Error2>(error: .Default).on(success: { _ in flow.append(2) }) } |
| 98 | + let task3 = { Task<(), Value3, Error3>(value: .Default).on(success: { _ in flow.append(3) }) } |
| 99 | + |
| 100 | + task1()._mapError(WrappedError.ByTask1) |
| 101 | + .success { _ in |
| 102 | + task2()._mapError(WrappedError.ByTask2) |
| 103 | + } |
| 104 | + .success { _ in |
| 105 | + task3()._mapError(WrappedError.ByTask3) |
| 106 | + } |
| 107 | + .on(failure: { error, isCancelled in |
| 108 | + guard case let .Some(.ByTask2(error2)) = error else { |
| 109 | + XCTFail("Wrong WrappedError.") |
| 110 | + return |
| 111 | + } |
| 112 | + XCTAssertEqual(error2, Error2.Default) |
| 113 | + XCTAssertEqual(flow, [1]) |
| 114 | + expect.fulfill() |
| 115 | + }) |
| 116 | + |
| 117 | + self.wait() |
| 118 | + } |
| 119 | +} |
| 120 | + |
| 121 | +extension Task |
| 122 | +{ |
| 123 | + /// Converts `Task<..., Error>` to `Task<..., WrappedError>`. |
| 124 | + private func _mapError(f: Error -> WrappedError) -> Task<Progress, Value, WrappedError> |
| 125 | + { |
| 126 | + return self.failure { error, isCancelled -> Task<Progress, Value, WrappedError> in |
| 127 | + if let error = error { |
| 128 | + return Task<Progress, Value, WrappedError>(error: f(error)) |
| 129 | + } |
| 130 | + else { |
| 131 | + // converts external cancellation -> internal rejection |
| 132 | + return Task<Progress, Value, WrappedError>(error: .Cancelled) |
| 133 | + } |
| 134 | + } |
| 135 | + } |
| 136 | +} |
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