Unit test Coverage percentage %0

I have written a simple application with a class that returns a boolean value. Here is my class:

class Functions {


    func someMethod() -> Bool{

        return true

    }

}

And i have written a simple Unit test class to test Functions class. Such as:

import XCTest
@testable import simpleApplication

class FunctionsTests: XCTestCase {

    func testSomeMethod(){

        let operation = Functions()


        XCTAssertTrue(operation.someMethod())

    }

}

The unit test passes. However the coverage is %0. You can see the coverage image . Any idea?