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60 lines
1.8 KiB
Swift
60 lines
1.8 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import XCTest
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import Combine
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/**
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XCTest utility to wait for results from publishers, so that the output can be used for assertions.
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```
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let collectedEvents = somePublisher.collect(3).first()
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XCTAssertEqual(try xcAwait(collectedEvents), [expected, values, here])
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```
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*/
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@available(iOS 14.0, *)
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extension XCTestCase {
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func xcAwait<T: Publisher>(
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_ publisher: T,
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timeout: TimeInterval = 10
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) throws -> T.Output {
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var result: Result<T.Output, Error>?
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let expectation = self.expectation(description: "Awaiting publisher")
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let cancellable = publisher.sink(
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receiveCompletion: { completion in
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switch completion {
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case .failure(let error):
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result = .failure(error)
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case .finished:
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break
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}
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expectation.fulfill()
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},
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receiveValue: { value in
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result = .success(value)
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}
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)
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waitForExpectations(timeout: timeout)
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cancellable.cancel()
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let unwrappedResult = try XCTUnwrap(
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result,
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"Awaited publisher did not produce any output"
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)
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return try unwrappedResult.get()
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}
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}
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