UITests.swift

class UITests: XCTestCase {
    
    let app = XCUIApplication()    
    let dynamicStubs = HTTPDynamicStubs()
    
    override func setUp() {
        super.setUp()
        dynamicStubs.setUp()
    }

    override func tearDown() {
        super.tearDown()
        dynamicStubs.tearDown()
    }
    
    func testPostCreation() {
        ...
        // Dynamically change the response to see if the feed gets refreshed and post is there
        dynamicStubs.setupStub(url: "/api/feed", filename: "feedWithCreatedPost")
        app.buttons["createPostButton"].tap()
        ...            
    }
}