Boundary value analysis in Testing Fundamentals - Test Execution Trace

Test Overview

This test checks if the input field correctly accepts values at the boundary limits and rejects values outside those limits. It verifies that the system handles edge cases properly.

Test Code - PyTest

Testing Fundamentals

def is_valid_input(value):
    return 1 <= value <= 10

def test_input_boundary_values():
    min_value = 1
    max_value = 10

    # Test lower boundary
    assert is_valid_input(min_value) == True

    # Test just below lower boundary
    assert is_valid_input(min_value - 1) == False

    # Test upper boundary
    assert is_valid_input(max_value) == True

    # Test just above upper boundary
    assert is_valid_input(max_value + 1) == False

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Test environment initialized	-	PASS
2	Call is_valid_input with value 1 (lower boundary)	Function receives input 1	Assert that return value is True	PASS
3	Call is_valid_input with value 0 (just below lower boundary)	Function receives input 0	Assert that return value is False	PASS
4	Call is_valid_input with value 10 (upper boundary)	Function receives input 10	Assert that return value is True	PASS
5	Call is_valid_input with value 11 (just above upper boundary)	Function receives input 11	Assert that return value is False	PASS
6	Test ends	All assertions passed	-	PASS

Failure Scenario

Failing Condition: The function incorrectly accepts a value outside the boundary or rejects a value within the boundary.

Execution Trace Quiz - 3 Questions

What value is tested to check the lower boundary?

A 0

B 1

C 10

D 11

Key Result

Boundary value analysis helps catch errors at the edges of input ranges by testing values just inside and just outside the limits, ensuring robust input validation.