Part of test selectable in UI test. https://github.com/Calvin-Huang/CHCarouselView/blob/master/CHCarouselViewUITests/CHCarouselViewUITests.swift

CHCarouselViewUITests_testChangeContentView.swift

func test_changeContentView() {
    let xctExpectation = expectation(description: "Wait for carousel auto slide.")
    let carouselView = self.app.scrollViews.element
    let alertView = self.app.alerts.element
    
    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 4.5) { [unowned self] in
        carouselView.tap()
        
        XCTAssertTrue(alertView.staticTexts["You selected page: 1 in carousel."].exists, "CarouselView should auto slides to second .")
        
        alertView.buttons["OK"].tap()
        
        self.app.buttons["Change Content To Colored Views"].tap()
        carouselView.tap()
        
        XCTAssertTrue(alertView.staticTexts["You selected page: 0 in carousel."].exists, "CarouselView should reset to first view.")
        alertView.buttons["OK"].tap()
    }
    
    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 12.5) {
        carouselView.tap()
        
        XCTAssertTrue(alertView.staticTexts["You selected page: 1 in carousel."].exists, "CarouselView should auto slides to secview after change content.")
        
        xctExpectation.fulfill()
    }
    
    waitForExpectations(timeout: 20.0) { e in
        XCTAssertTrue(e == nil, "Everything not completed in 10.0 sec.")
    }
}