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Swift Academy · Lesson

XCTest basics (targets, fixtures)

Set up XCTest targets in Swift packages or Xcode projects, write test cases, and manage fixtures with setUp / tearDown .

XCTest basics (targets, fixtures) is a free Swift Academy lesson on CoddyKit — lesson 1 of 2. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Swift Academy learning path, one of 2 lessons in the course, and your progress syncs across the web and the CoddyKit app.

XCTest intro

Swift uses XCTest for unit testing. Create a test target, subclass XCTestCase, and write methods starting with test.

Basic test method

A test case is a subclass of XCTestCase. Each test method must start with test and use assertions.

import XCTest

final class MathTests: XCTestCase {
    func testAdd() {
        XCTAssertEqual(2 + 2, 4)
    }
}

Assertions

Common assertions:

  • XCTAssertTrue, XCTAssertFalse
  • XCTAssertEqual, XCTAssertNotEqual
  • XCTAssertNil, XCTAssertNotNil

Fixtures example

Use setUp()/tearDown() to prepare and clean up state before/after each test.

final class FixtureTests: XCTestCase {
    var numbers: [Int]!
    override func setUp() {
        super.setUp()
        numbers = [1,2,3]
    }
    override func tearDown() {
        numbers = nil
        super.tearDown()
    }
    func testCount() {
        XCTAssertEqual(numbers.count, 3)
    }
}

Running tests

Run tests:

  • swift test (SwiftPM)
  • Xcode: Product → Test (⌘U)
  • CI: integrate xcodebuild test or swift test in pipelines

Tips for structure

Tips:

  • Name test methods descriptively.
  • Group related tests into files/classes.
  • Keep each test independent.
  • Use fixtures sparingly: prefer explicit setup when possible.

Fixtures question

Quick check: Which methods prep/clean state around tests?

Recap

Recap: Subclass XCTestCase, write test* methods, use assertions, and manage fixtures with setUp/tearDown.

Frequently asked questions

Is the “XCTest basics (targets, fixtures)” lesson free?

Yes — the full text of “XCTest basics (targets, fixtures)” is free to read here on the web, and the Swift Academy course includes 2 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Swift Academy course, upgrade to CoddyKit PRO.

What will I learn in “XCTest basics (targets, fixtures)”?

Set up XCTest targets in Swift packages or Xcode projects, write test cases, and manage fixtures with setUp / tearDown . You practise Swift Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Swift Academy?

No prior experience is required. Swift Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 2, so you can start here or from the beginning and move at your own pace.

How long does the “XCTest basics (targets, fixtures)” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Swift Academy lesson?

Yes. Every Swift Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. XCTest basics (targets, fixtures)
  2. Logging, assert/precondition/fatalError
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