UITests.swift

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import XCTest

class UITests: XCTestCase {

    override func setUp() {
        continueAfterFailure = false
    }

    // This test requires the device to be in English language.
    func testConnection() {
        // UI tests must launch the application that they test.
        let app = XCUIApplication()
        app.launchArguments = ["mocking-enabled"]
        app.launch()
        
        // Start scanning
        let scanner = app.tables["scanResults"]
        XCTAssert(scanner.cells["nRF Blinky"].waitForExistence(timeout: 2.0))
        
        // Wait for device to appear and tap it.
        XCTAssertEqual(scanner.cells.count, 1)
        scanner.cells["nRF Blinky"].tap()
        
        let control = app.tables["control"]
        let ledState = control.staticTexts["ledState"]
        let buttonState = control.staticTexts["buttonState"]
        let ledSwitch = control.switches["ledSwitch"]
        XCTAssertEqual(ledState.label, "UNKNOWN")
        XCTAssertEqual(buttonState.label, "UNKNOWN")
        
        // Wait for the device to connect.
        sleep(1)
        XCTAssertEqual(ledState.label, "OFF")
        XCTAssertEqual(buttonState.label, "RELEASED")
        XCTAssert(ledSwitch.isOn == false)
        
        // Tap LED switch to turn the LED on.
        ledSwitch.tap()
        XCTAssert(ledSwitch.isOn == true)
        XCTAssertEqual(ledState.label, "ON")
        
        // Tap the LED switch again to disable it.
        ledSwitch.tap()
        XCTAssert(ledSwitch.isOn == false)
        XCTAssertEqual(ledState.label, "OFF")
        
        // Navigating back and disconnecting.
        app.buttons["Scanner"].tap()
        XCTAssertEqual(scanner.cells.count, 0)
        
        // nRF Blinky should start advertising quickly.
        XCTAssert(scanner.cells["nRF Blinky"].waitForExistence(timeout: 2.0))
        XCTAssertEqual(scanner.cells.count, 1)
    }

    func testLaunchPerformance() {
        if #available(macOS 10.15, iOS 13.0, tvOS 13.0, *) {
            // This measures how long it takes to launch your application.
            measure(metrics: [XCTOSSignpostMetric.applicationLaunch]) {
                XCUIApplication().launch()
            }
        }
    }
}

private extension XCUIElement {
    
    var isOn: Bool {
        if let value = value as? String {
            return value == "1"
        }
        return false
    }
    
}