also you can forget to use expectation.fulfill() , that in some chain never called, when you use: let expectation = self.expectation(description: "testCurrentUser") waitForExpectations(timeout: 5, handler: nil)

Maybe you use in your XCTestCase override func setUp(completion: @escaping ((any Error)?) -> Void) { } override func tearDown(completion: @escaping ((any Error)?) -> Void) {} and never call the completion(), to let it continue