Funny

Beginner play Test-Driven Development(TDD) in swift

2 day ago i learn about TDD: Test Driven Development when i read content i think why we should have TDD process when we develop some app. I found it from 3 site below.

Two goal for doing Test-Driven Development

Make sure my code is in the right place

Make sure my logic is correct

I try coding abit on “Nil Test”, use XCTAssertNotNil to assert the existence of a given value.
Let try…

tdd_exTests.swift

func testSetupVarFunctionAfterViewDidLoads() {
        let vc = ViewController()
        
        vc.viewDidLoad()
        XCTAssertNotNil((vc.myVar), "myVar is not setup")
        
    }

tdd_exTests.swift

func testSetupVarFunctionAfterViewDidLoads() {

let vc = ViewController()

vc.viewDidLoad()

XCTAssertNotNil((vc.myVar), "myVar is not setup")

}

and .. my view controller

viewcontroller.swift

class ViewController: UIViewController {

    var myVar:String?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
//        self.myVar = setupVar("My Text")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func setupVar(text:String) -> String {
        return text
    }
}

viewcontroller.swift

class ViewController: UIViewController {

var myVar:String?

override func viewDidLoad() {

super.viewDidLoad()

// self.myVar = setupVar("My Text")

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

func setupVar(text:String) -> String {

return text

}

Try try try … and don’t forget check your test in Target Membership on File inspector

and then run test use command+u …
WTH!!! We will see

Oh why.. why it not pass , because myVar on view controller is Nil
You try to uncomment this line on view controller and run test again (command+u)


self.myVar = setupVar("My Text")

self.myVar = setupVar("My Text")

Success!! We will see

Wow nice development process for us. You can try other XCTest Assertions on list

Fundamental Test : XCTAssert(expression, format…)
Boolean Tests : XCTAssert[False]True(expression, format…)
Equality Tests : XCTAssert[Not]Equal(expression1, expression2, format…)
Equality(Double,Float or other floating-point) Tests : XCTAssert[Not]EqualWithAccuracy(expression1, expression2, accuracy, format…)
Nil Tests : XCTAssert[Not]Nil(expression, format…)
Unconditional Failure : XCTFail(format…)

Example project : Download
Next time we will talk about Performance Testing and XCTestExpectation.
K Bye .

Thank nice image from
http://littlevisuals.co/