Using override init() in an XCtest class?

Question

I'm wondering if there is a way to use unit when XCtesting in order to specify a constant variable that isn't torn down between separate test cases? I realize that generally best practices for unit testing are to keep the tests as self contained as possible but in my current situation it would make the tests execute a lot faster if I were able to do this and keep a constant variable between test cases.

Currently, any type of init function that I call

override init() {
    super.init()
}

Leaves me with an EXC_BAD_INSTRUCTION error. If I can't use init() in XCTestCase, is there another work around that I can use?

Answer 1

Try moving the variable outside of the XCTestCase class.

import XCTest

var counter = 0 // Note this is outside the class declaration

class MyTests: XCTestCase {
    override func setUp() {
        super.setUp()
        counter++
        print("Counter: \(counter)")
    }

    func testOne() {
        ...
    }

    func testTwo() {
        ...
    }

    func testThree() {
        ...
    }
}

This gives an output like this.

...
Counter: 1
...
Counter: 2
...
Counter: 3
...