Write any 4 tests cases for traffic signal.

Write any 4 tests cases for traffic signal.

Test Case 1: Red Light Signal Duration

Test Case ID: TS001
Test Description: Verify that the Red light stays on for the correct specified duration.
Test Steps:

1. Start the traffic signal system.

2. Observe the Red light when it turns on.

3. Use a timer to measure how long it stays on.

Expected Result: The Red light should stay on for the specified time (e.g., 60 seconds).
Pass/Fail Criteria: Pass if the duration matches 60 seconds; Fail if it is too short or too long.

Test Case 2: Green Light After Red

Test Case ID: TS002
Test Description: Verify that the Green light turns on after the Red light and stays for the correct duration.
Test Steps:

1. Wait for the Red light to turn off.

2. Observe the Green light turning on.

3. Measure how long it stays on using a timer.

Expected Result: The Green light should turn on immediately after the Red light and stay on for the specified time (e.g., 45 seconds).
Pass/Fail Criteria: Pass if the Green light follows the Red light and stays for 45 seconds; Fail otherwise.

Test Case 3: Yellow Light Transition

Test Case ID: TS003
Test Description: Verify that the Yellow light turns on before switching between Red and Green lights.
Test Steps:

1. Observe the Yellow light turning on after the Green light.

2. Measure how long the Yellow light stays on.

Expected Result: The Yellow light should turn on for a short time (e.g., 5 seconds) before changing to Red.
Pass/Fail Criteria: Pass if the Yellow light is on for the correct time; Fail otherwise.

Test Case 4: Pedestrian Crossing

1. Press the pedestrian crossing button.

2. Observe the pedestrian signal (e.g., Green light for crossing).

3. Check if it stops after the crossing duration ends.

Expected Result: The pedestrian signal should turn Green when the traffic light is Red and stop after the crossing time (e.g., 30 seconds).
Pass/Fail Criteria: Pass if the pedestrian signal behaves as expected; Fail otherwise.