#!/usr/bin/env python
# Line 1: General comment/header for the module (Consider expanding or clarifying the purpose of the module)
# test
def add(a, b):  # Line 3: Define function add; adds two numbers.
    # Line 4: Return the sum of a and b.
    return a + b

def subtract(a, b):  # Line 7: Define function subtract; subtracts b from a.
    # Line 8: Return the difference between a and b.
    return a - b

def multiply(a, b):  # Line 11: Define function multiply; multiplies two numbers.
    # Line 12: Return the product of a and b.
    return a * b

def divide(a, b):  # Line 15: Define function divide; divides a by b.
    # Line 16: Check to prevent division by zero.
    if b == 0:
        # Line 17: Raise an appropriate error when dividing by zero.
        raise ValueError("Cannot divide by zero")
    # Line 18: Return the quotient after confirming b is not zero.
    return a / b

# The following function intentionally contains a bug.
def buggy_function(x):  # Line 22: Define a function intended for testing error handling.
    # Line 23: Always performs division by zero, which will raise a ZeroDivisionError.
    # Issue:
    #   - Bug on line 23: Division by zero makes this function unusable.
    #   - Fix: Remove the division by zero, or implement logic to prevent it.
    return x / 0  # BUG: Division by zero error intended for testing

# The following function has minor style/linter issues.
def another_function( a ,b ):  # Line 28: Define a function with inconsistent spacing.
    # Issue:
    #   - Extra spaces around parameters reduce code consistency.
    #   - Fix: Remove extra spaces so the signature reads: def another_function(a, b):
    # Line 29: Return the sum of a and b (valid but formatting can be improved).
    return a+b

# The following function contains potential logical bugs.
def faulty_logic(a, b):  # Line 32: Define function with logic that might be incorrect.
    # Line 33: Check if a is greater than b.
    if a > b:
        # Line 34: Return b - a; Issue:
        #   - Logical Bug: If a > b, it might be expected to return a - b, not b - a.
        #   - Fix: Adjust the calculation based on the intended functionality.
        return b - a  # BUG: Possibly incorrect operation when a > b.
    # Line 36: Return a - b in case a is not greater than b.
    return a - b  # Note: The differing logic depending on condition might be unintended.
    
# Additional Comments and Suggestions:
# 1. Code Quality:
#    - The functions are clearly named and have simple implementations.
#    - Consider adding docstrings to each function to clarify intent and parameters.
# 2. Edge Cases:
#    - In the divide function, ensure that the input types support division.
# 3. Performance Issues:
#    - All functions are simple arithmetic operations, so performance is not a concern.
# 4. Security Concerns:
#    - The code does not handle external input or unsafe operations, so no immediate issues.
# 5. Style Consistency:
#    - Ensure consistent whitespace, especially in function definitions (see another_function).
#    - Consider using a linter (like pylint or flake8) to catch style issues.
# 6. Potential Bugs:
#    - buggy_function intentionally triggers a ZeroDivisionError.
#    - faulty_logic contains ambiguous logic that should be verified for its intended behavior.
    
# End of module.

import pytest
from evaluate.buggy-code-file import add, subtract, multiply, divide, buggy_function, another_function, faulty_logic

def test_add():
    # Typical case
    assert add(2, 3) == 5
    # Negative numbers
    assert add(-1, 1) == 0
    # Zero values
    assert add(0, 0) == 0

def test_subtract():
    # Typical case
    assert subtract(5, 3) == 2
    # Negative result
    assert subtract(3, 5) == -2
    # Zero values
    assert subtract(0, 0) == 0

def test_multiply():
    # Typical multiplication
    assert multiply(4, 3) == 12
    # Multiplication with zero
    assert multiply(0, 5) == 0
    # Negative numbers
    assert multiply(-2, 3) == -6

def test_divide():
    # Typical division
    assert divide(10, 2) == 5
    # Negative division
    assert divide(-9, 3) == -3
    # Division by zero should raise ValueError
    with pytest.raises(ValueError):
        divide(1, 0)

def test_buggy_function():
    # Since buggy_function always divides by zero, it should raise ZeroDivisionError
    with pytest.raises(ZeroDivisionError):
        buggy_function(10)
    with pytest.raises(ZeroDivisionError):
        buggy_function(0)

def test_another_function():
    # Although the function has linter spacing issues, it should correctly add the inputs
    assert another_function(3, 4) == 7
    assert another_function(-1, -1) == -2
    assert another_function(0, 0) == 0

def test_faulty_logic():
    # When a > b, the function returns b - a (which might be considered a bug)
    result1 = faulty_logic(5, 3)
    assert result1 == (3 - 5)  # Expected based on the buggy logic

    # When a <= b, it returns a - b
    result2 = faulty_logic(2, 5)
    assert result2 == (2 - 5)  # This follows the current implementation

    # Edge case where a equals b
    result3 = faulty_logic(4, 4)
    assert result3 == 0