Checking out test cases in a Vapor boilerplate project

Now that you've learned the basic workflow of how XCTest runs tests, it makes sense for you to check out the default test cases in a Vapor boilerplate project. The default test case template in a Vapor project gives you a bare-bones implementation of tests without any testing logic. It serves as a simple starting point for you to add more real tests to your project.

File: /Tests/AppTests/AppTests.swift

import App
import XCTest // [1]

final class AppTests: XCTestCase { // [2]
 func testNothing() throws { // [3]
 // add your tests here
 XCTAssert(true) // [4]
 }

 static let allTests = [ // [5]
 ("testNothing", testNothing)
 ]
}

The following is a list of what the preceding bare-bones source code does:

1. Imports the XCTest module
2. Declares a new class by subclassing from XCTestCase
3. Defines the first test function with a test prefix
4. Adds a dummy assertion that always turns out to be true
5. Defines a static array that contains all test functions

The macro XCTAssert() in [4] asserts a given Boolean expression to be true. Swift actually provides many different macros for test assertions. Next, you'll check out some of the assertion macros useful for your tests.