Run unit tests inside Xcode playground

XcodePlaygroundUnitTests.swift

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import XCTest

struct TodoItem {
    let title: String
    let dueBy: Date?
    
    init(title: String) {
        self.title = title
        self.dueBy = nil
    }
}

class TodoTests: XCTestCase {
    
    override func setUp() {
        super.setUp()
    }
    override func tearDown() {
        super.tearDown()
    }
    
    func testTodo() {
        let taskTitle = "finish laundry"
        let todo = TodoItem(title: taskTitle)
        XCTAssertEqual(todo.title, taskTitle)
    }
}

TodoTests.defaultTestSuite.run()

Using Xcode 12.5 and gives the error "Cannot find 'XCTAssertEqual' in scope". Is it not supported now?

Working fine for me in Xcode 12.5. Make sure you used import XCTest and make all your classes public if you put them under Sources folder.

Thank you for the example code! I just read John Sundell's article - found it hard to follow... expected more of the classic unit test runner pattern etc.

https://www.swiftbysundell.com/articles/writing-unit-tests-in-a-swift-playground/

It appears that Unit Testing in Playground just happens to work - as opposed to a designed Feature of Playgrounds.