Verify login functionality on mobile app

Preconditions (2)

Step 1: Launch the mobile app

Step 2: Enter 'testuser' in the username field

Step 3: Enter 'Test@1234' in the password field

Step 4: Tap the Login button

Step 5: Wait for the home screen to load

✅ Expected Result: User is successfully logged in and home screen is displayed

Automation Requirements - Appium with Python

Assertions Needed:

Verify the home screen element is visible after login

Verify no error message is displayed

Best Practices:

Use explicit waits to wait for elements

Use accessibility ids or resource ids for locating elements

Handle mobile-specific gestures if needed

Keep test steps clear and simple

Automated Solution

Testing Fundamentals

from appium import webdriver
from appium.webdriver.common.appiumby import AppiumBy
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

caps = {
    "platformName": "Android",
    "deviceName": "Android Emulator",
    "appPackage": "com.example.mobileapp",
    "appActivity": ".MainActivity",
    "automationName": "UiAutomator2"
}

# Connect to Appium server
driver = webdriver.Remote('http://localhost:4723/wd/hub', caps)

try:
    wait = WebDriverWait(driver, 10)

    # Wait for username field and enter username
    username_field = wait.until(EC.presence_of_element_located((AppiumBy.ACCESSIBILITY_ID, "username_input")))
    username_field.send_keys("testuser")

    # Enter password
    password_field = driver.find_element(AppiumBy.ACCESSIBILITY_ID, "password_input")
    password_field.send_keys("Test@1234")

    # Tap login button
    login_button = driver.find_element(AppiumBy.ACCESSIBILITY_ID, "login_button")
    login_button.click()

    # Wait for home screen element
    home_screen_element = wait.until(EC.presence_of_element_located((AppiumBy.ACCESSIBILITY_ID, "home_screen")))

    # Assert home screen is displayed
    assert home_screen_element.is_displayed(), "Home screen is not displayed after login"

    # Assert no error message
    error_elements = driver.find_elements(AppiumBy.ACCESSIBILITY_ID, "login_error")
    assert len(error_elements) == 0, "Error message displayed after login"

finally:
    driver.quit()

This script uses Appium with Python to automate the mobile login test.

We set capabilities to connect to an Android emulator and specify the app package and activity.

We use explicit waits to wait for the username field to appear before interacting.

We locate elements by accessibility id, which is a best practice for mobile apps.

After entering credentials and tapping login, we wait for the home screen element to confirm successful login.

Assertions check that the home screen is visible and no error message is shown.

Finally, the driver quits to close the session.

Common Mistakes - 3 Pitfalls

Using Thread.sleep instead of explicit waits

Using XPath locators that are too long or brittle

Not quitting the driver session after test

Bonus Challenge

Now add data-driven testing with 3 different username and password combinations

Show Hint