What are integration testing setup for Combine in Swift?

Integration testing for Combine in Swift involves testing the interactions between multiple components in your application, particularly those that rely on Combine publishers and subscribers. The goal is to ensure that your Combine chains work correctly together and handle various scenarios as expected.

Typically, you would set up a testing environment where you can verify the behavior of your Combine streams, including error handling and completion events.

Example

import XCTest import Combine class CombineIntegrationTests: XCTestCase { var subscriptions = Set() func testCombineIntegration() { // Setup publishers and subscribers let publisher1 = PassthroughSubject() let publisher2 = PassthroughSubject() let expectation = self.expectation(description: "Combine Integration Test") publisher1 .merge(with: publisher2) .sink(receiveCompletion: { completion in if case .finished = completion { // Completed successfully } }, receiveValue: { value in XCTAssertEqual(value, "Hello, Combine!") expectation.fulfill() }) .store(in: &subscriptions) // Emit values from publishers publisher1.send("Hello, ") publisher2.send("Combine!") // Finish the publishers publisher1.send(completion: .finished) publisher2.send(completion: .finished) waitForExpectations(timeout: 1, handler: nil) } }

integration testing Combine Swift publishers subscribers XCTest

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