Mobile-specific test cases in Testing Fundamentals - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Why is testing on multiple screen sizes important for mobile apps?

Mobile devices come in many screen sizes. Why must testers check the app on different screen sizes?

A Because smaller screens do not support touch input

B To ensure the app layout adapts and remains usable on all screen sizes

C Because larger screens always run apps faster

D To reduce the app size for smaller screens

💡 Hint

Think about how the app looks and works on phones vs tablets.

Different screen sizes can change how content fits and how users interact. Testing ensures the app is usable and visually correct on all devices.

❓ Predict Output

intermediate

What is the output of this mobile network state test code?

Consider this pseudocode that checks network state on a mobile device:

network = getNetworkState()
if network == 'wifi':
    print('Connected to WiFi')
elif network == 'cellular':
    print('Using mobile data')
else:
    print('No network')

If the device is in airplane mode, what will be printed?

A No network

B Using mobile data

C Connected to WiFi

D Error: network variable undefined

💡 Hint

Airplane mode disables all network connections.

In airplane mode, no network is available, so the else branch runs printing 'No network'.

❓ assertion

advanced

Which assertion correctly verifies the app handles low battery warning on mobile?

You want to test that the app shows a warning message when battery level is below 15%. Which assertion is correct?

Testing Fundamentals

battery_level = 10
warning_displayed = app.checkLowBatteryWarning(battery_level)
# Which assertion below is correct?

A assert warning_displayed == True

B assert warning_displayed != True

C assert warning_displayed = True

D assert warning_displayed == False

💡 Hint

Remember the syntax for equality check in assertions.

Option A correctly uses '==' to check if warning_displayed is True. Option A uses assignment '=' which is invalid in assert. Options A and D check for False which is incorrect.

🔧 Debug

advanced

Find the bug in this mobile orientation test code

Here is code to detect if the device is in landscape mode:

def isLandscape(width, height):
    if width > height:
        return True
    else
        return False

What is the bug?

A Parameters should be height, width instead

B Wrong comparison operator, should be width < height

C Missing colon after else

D Function should return string, not boolean

💡 Hint

Check syntax carefully after else statement.

The else statement is missing a colon at the end, causing a syntax error.

❓ framework

expert

Which mobile testing framework supports both Android and iOS with a single codebase?

You want to automate tests for a mobile app on both Android and iOS using one codebase. Which framework is best?

A JUnit

B Espresso

C XCUITest

D Appium

💡 Hint

Consider cross-platform support.

Appium supports both Android and iOS automation with one codebase. Espresso is Android-only, XCUITest is iOS-only, and JUnit is a general Java testing framework.