Code review as testing in Testing Fundamentals - Test Execution Trace

Test Overview

This test simulates a code review process to check for common coding errors and adherence to best practices before running the code. It verifies that the code meets quality standards and is free of obvious mistakes.

Test Code - PyTest

Testing Fundamentals

def code_review_check(code_lines):
    issues = []
    for i, line in enumerate(code_lines, 1):
        if 'print' in line and not line.strip().endswith(')'):
            issues.append(f"Line {i}: print statement missing closing parenthesis")
        if '==' in line and 'if' not in line:
            issues.append(f"Line {i}: '==' used outside if condition")
        if line.strip().startswith('def') and not line.strip().endswith(':'):
            issues.append(f"Line {i}: function definition missing colon")
    return issues

# Example code to review
sample_code = [
    "def greet()",  # Missing colon
    "    print('Hello world'",  # Missing closing parenthesis
    "x == 5",  # '==' outside if
    "if x == 5:",
    "    print('x is 5')"
]

issues_found = code_review_check(sample_code)
assert len(issues_found) == 3, f"Expected 3 issues, found {len(issues_found)}"

Execution Trace - 8 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Test environment ready with sample code lines loaded	-	PASS
2	code_review_check function is called with sample code	Function processes each line of code	-	PASS
3	Line 1 checked: 'def greet()' missing colon detected	Issues list updated with line 1 issue	-	PASS
4	Line 2 checked: print statement missing closing parenthesis detected	Issues list updated with line 2 issue	-	PASS
5	Line 3 checked: '==' used outside if condition detected	Issues list updated with line 3 issue	-	PASS
6	Lines 4 and 5 checked: no issues found	Issues list remains unchanged	-	PASS
7	Assert that 3 issues were found	Issues list contains 3 items	assert len(issues_found) == 3	PASS
8	Test ends successfully	All checks passed, issues correctly identified	-	PASS

Failure Scenario

Failing Condition: The code review function misses one or more issues or reports incorrect number of issues

Execution Trace Quiz - 3 Questions

What does the test verify about the sample code?

A It runs the sample code and checks output correctness

B It measures the performance of the sample code

C It checks for common syntax errors and coding mistakes before running the code

D It verifies the sample code connects to a database

Key Result

Code review acts as an early testing step to catch errors and improve code quality before actual execution, saving time and reducing bugs.