Could not load Main.Storyboard in XCUITest

Question

I am try to make UITestCase for UIViewcontrollers, But when I load main storyboard in my QuizAppUITests, It could not identify from Bundle and it's gives below error

Could not find a storyboard named 'Main' in bundle NSBundle </Users/mac/Library/Developer/CoreSimulator/Devices/CC199C69-F398-4A7C-882E-BFD3E72B95D3/data/Containers/Bundle/Application/BCC3F88D-E08C-4491-8340-699EAF98AB28/QuizAppUITests-Runner.app> (loaded) (NSInvalidArgumentException)

I have added Main Storyboard in QuizAppUITests Target as well And below is my code for test

import XCTest
@testable import QuizApp

class QuizViewControllerUITests: XCTestCase {
    func makeSUT() -> QuizViewController {
        let storyboard = UIStoryboard(name: "Main", bundle: Bundle(for: type(of: self)))
        let sut = storyboard.instantiateViewController(withIdentifier: "QuizViewController") as! QuizViewController
        _ = sut.view
        return sut
    }
    
    func test_loadQuizViewController() {
        let sut = makeSUT()
        sut.headerQuestion = "Q1"
        XCTAssertEqual(sut.headerQuestion, "Q1")
    }

}

Is there any required to change in BuildSetting of QuizAppUITests Target?

What are you trying to do? I don't know why are you using storyboard for UITest. There other way better ways for UITesting in iOS. — Kudos, Mar 19 '21 at 15:06
Agreed this is a very strange way to use XCUITest. It's like a unit test UI test. — Mike Collins, Mar 19 '21 at 15:31
@Kudos I want to check instantiateViewController from storyboard and storyboard exist in Bundle or not. — Hitesh, Mar 19 '21 at 17:28

Jon Reid · Accepted Answer · 2021-03-22T17:46:01.467

None of this makes sense for a UI test. Instead, put your code into your unit test target, which is QuizAppTests.

My book iOS Unit Testing by Example has a chapter called "Load View Controllers". Looking there for what it says about storyboard-based view controllers:

Don't include the storyboard in your test target. Put it only in your app target.
Then you can load the storyboard with UIStoryboard(name: "Main", bundle: nil)
There's a new way to instantiate the view controller that doesn't require force-casting. Instead of instantiateViewController(withIdentifier:), use instantiateViewController(identifier:) and assign it to an explicitly typed variable.

Like this:

let sut: QuizViewController = storyboard.instantiateViewController(
    identifier: "QuizViewController"
)

Since you use the name of the class as the identifier, we can even get rid of the string. This protects us from typos, at compile time:

let sut: QuizViewController = storyboard.instantiateViewController(
    identifier: String(describing: QuizViewController.self)
)

Finally, instead of _ = sut.view, we can be more explicit about loading the view:

sut.loadViewIfNeeded()

This hooks up the outlet connections.

Again, all this belongs in your unit test target QuizAppTests, not your UI test target QuizAppUITests.

For your actual tests, don't just assign a property in your system under test and check that it was assigned. That doesn't prove anything. Instead, I'd focus on testing:

That outlets are not nil
That interacting with controls does what you want
That navigation works
That view appearance hasn't changed from an approved snapshot

This can all be done with TDD.

Could not load Main.Storyboard in XCUITest

1 Answers1