Swift test give error “Undefined symbols for architecture x86_64”

Question

I\'m running swift test from the command line to run the test cases. This is the test case:

import XCTest
@testable import vnk_swift

class KeyM         


        

Answer 1

This seems to be caused my having a main.swift in your module directory. This results in an executable being build, instead of a library against which your test cases can be linked.

I resolved this issue by splitting my code into two modules. A library for which I have test cases and the application that only contains main.swift:

Package.swift
Sources\FooBarLib\
Sources\FooBarLib\Something.swift
Sources\FooBarLib\MoreStuff.swift
Sources\FooBarApp\main.swift
Tests\FooBarLibTests\TestSomething.swift

Then in my Package.swift make sure FooBarApp depends on FooBarLib:

import PackageDescription

let package = Package(
    name: "FooBar",
    targets: [
        .target(name: "FooBarLib"),
        .target(name: "FooBarApp", dependencies: ["FooBarLib"])
    ],
)

Then in TestSomething.swift you import the FooBarLib module:

@testable import FooBarLib
import XCTest

class TestSomething: XCTestCase {
    func testFunc() {
    }
}