How do I write snapshot tests in Combine with Swift?

Snapshot testing in Combine allows you to verify the output of your Combine publishers in a predictable manner. By capturing the state of your publishers at a given moment, you can ensure that any subsequent changes do not inadvertently alter the expected behavior of your code.

Snapshot Testing, Combine, Swift, iOS Testing, Reactive Programming

This article explains how to implement snapshot tests using Combine in Swift, ensuring that your publishers yield the expected output.

// Example of a simple Combine publisher and a snapshot test import Combine import XCTest class MyPublisherTests: XCTestCase { var cancellables = Set() func testMyPublisherSnapshot() { // Given let publisher = Just("Hello, Combine!") .eraseToAnyPublisher() // When let expectation = XCTestExpectation(description: "Snapshot Test") publisher .sink(receiveCompletion: { _ in }, receiveValue: { value in // Then XCTAssertEqual(value, "Hello, Combine!") // Snapshot assertion expectation.fulfill() }) .store(in: &cancellables) wait(for: [expectation], timeout: 1.0) } }

Snapshot Testing Combine Swift iOS Testing Reactive Programming

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