XCTest Best Practices

Test Structure

Arrange-Act-Assert Pattern

func testAddItemToList_incrementsCount() {
    // Arrange
    let list = List(name: "Groceries")
    let initialCount = list.items.count

    // Act
    list.addItem(Item(text: "Milk"))

    // Assert
    XCTAssertEqual(list.items.count, initialCount + 1)
}