Unit test fails on AppCenter with error "Variable used within its own initial value"

Question

I added the Debounce class taken from here: https://stackoverflow.com/a/59296478/945247

This class has the unit test below which passes locally but fails on AppCenter with the error "Variable used within its own initial value":

func test_entering_text_delays_processing_until_settled() {
    let expect = expectation(description: "processing completed")
    
    var finalString: String = ""
    var timesCalled: Int = 0
    
    let process: (String) -> () = {
        finalString = $0
        timesCalled += 1
        expect.fulfill()
    }

    Debounce<String>.input("A", comparedAgainst: "AB", perform: process)
    Debounce<String>.input("AB", comparedAgainst: "ABCD", perform: process)
    Debounce<String>.input("ABCD", comparedAgainst: "ABC", perform: process)
    Debounce<String>.input("ABC", comparedAgainst: "ABC", perform: process)

    wait(for: [expect], timeout: 2.0)

    XCTAssertEqual(finalString, "ABC")
    XCTAssertEqual(timesCalled, 1)
}

I can't see anyting in that code which would cause that error, let alone just on AppCenter.

Edit:

Here's the full details I have from the AppCenter logs:

2021-10-06T16:05:31.0647180Z Testing failed:
2021-10-06T16:05:31.0647560Z    Variable used within its own initial value
2021-10-06T16:05:31.0647980Z    Testing cancelled because the build failed.
2021-10-06T16:05:31.0648180Z 
2021-10-06T16:05:31.0648460Z ** TEST FAILED **
2021-10-06T16:05:31.0648610Z 
2021-10-06T16:05:31.0648720Z 
2021-10-06T16:05:31.0649050Z The following build commands failed:
2021-10-06T16:05:31.0649560Z    CompileSwift normal x86_64 /Users/runner/work/1/s/AppTests/Utilities/DebounceTests.swift
2021-10-06T16:05:31.0650120Z    CompileSwiftSources normal x86_64 com.apple.xcode.tools.swift.compiler

I have been able to confirm that it's the debounce tests which are causing the failure because I commented out the above test and the app built, when I uncommented it the build failed with the same error.

Sorry for being ignorant, but what is "AppCenter"? Also, can you say any more about what line triggers the error? This is evidently a compile error so there ought to be line number information. — matt, Oct 06 '21 at 16:18
Hi matt, AppCenter: https://appcenter.ms which includes tools for CI/CD. There's no line number unfortunately, just an entry in the AppCenter build logs. — Leon, Oct 06 '21 at 16:32
No line number for the compile error? Strange, as xcodebuild surely gives such information. — Cristik, Oct 06 '21 at 17:18
Also, if you don't know the line number, how do you know that the problem is in that piece of code you posted in the question? — Cristik, Oct 06 '21 at 17:20

Unit test fails on AppCenter with error "Variable used within its own initial value"

0 Answers0