What are mocking and stubbing techniques for Vision in Swift?

Mocking and stubbing are essential techniques in unit testing, particularly when working with external libraries like Vision in Swift. These techniques allow developers to simulate the behavior of complex objects to isolate and test components without relying on actual implementations.

Stubbing

Stubbing is the practice of creating a simplified version of a component to return controlled responses. For instance, when testing an app that uses the Vision framework for image processing, you may stub responses from the Vision requests to avoid dependency on real image analysis.

Mocking

Mocking involves creating a mock object that verifies interactions between components. With mocking, you can assert that specific methods were called on your Vision objects during the testing process.

Example of Mocking and Stubbing Using Vision in Swift

// Example of stubbing a Vision request func testVisionTextRecognition() { let mockRequest = MockVNRecognizeTextRequest() mockRequest.recognitionLevel = .accurate // Stub the response let stubbedResults = [VNRecognizedTextResult(text: "Hello", confidence: 1.0)] mockRequest.stubbedResults = stubbedResults // Your code using Vision with the stubbed result let observation = mockRequest.perform() XCTAssertEqual(observation.first?.recognizedText, "Hello") }

Mocking Stubbing Vision Framework Swift Unit Testing Image Processing

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