test_calculator.py

#!/usr/bin/env python3
"""
Test suite for Calculator class
This file tests the calculator.py implementation
"""

import sys
import os
import importlib.util

def test_calculator_class():
    """
    Test the Calculator class implementation
    Returns 1.0 if all tests pass, 0.0 if any test fails
    """
    try:
        # Import the calculator module
        calculator_path = "/home/user/Desktop/calculator.py"
        
        if not os.path.exists(calculator_path):
            print("ERROR: calculator.py file not found")
            return 0.0
        
        # Load the module dynamically
        spec = importlib.util.spec_from_file_location("calculator", calculator_path)
        calculator_module = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(calculator_module)
        
        # Check if Calculator class exists
        if not hasattr(calculator_module, 'Calculator'):
            print("ERROR: Calculator class not found")
            return 0.0
        
        Calculator = calculator_module.Calculator
        
        # Test 1: Create instance
        try:
            calc = Calculator()
            print("✓ Calculator instance created successfully")
        except Exception as e:
            print(f"ERROR: Failed to create Calculator instance: {e}")
            return 0.0
        
        # Test 2: Test add method
        try:
            result = calc.add(10, 5)
            if result == 15:
                print("✓ Add method works correctly")
            else:
                print(f"ERROR: Add method returned {result}, expected 15")
                return 0.0
        except Exception as e:
            print(f"ERROR: Add method failed: {e}")
            return 0.0
        
        # Test 3: Test subtract method
        try:
            result = calc.subtract(10, 5)
            if result == 5:
                print("✓ Subtract method works correctly")
            else:
                print(f"ERROR: Subtract method returned {result}, expected 5")
                return 0.0
        except Exception as e:
            print(f"ERROR: Subtract method failed: {e}")
            return 0.0
        
        # Test 4: Test multiply method
        try:
            result = calc.multiply(10, 5)
            if result == 50:
                print("✓ Multiply method works correctly")
            else:
                print(f"ERROR: Multiply method returned {result}, expected 50")
                return 0.0
        except Exception as e:
            print(f"ERROR: Multiply method failed: {e}")
            return 0.0
        
        # Test 5: Test divide method (normal case)
        try:
            result = calc.divide(10, 5)
            if result == 2.0:
                print("✓ Divide method works correctly")
            else:
                print(f"ERROR: Divide method returned {result}, expected 2.0")
                return 0.0
        except Exception as e:
            print(f"ERROR: Divide method failed: {e}")
            return 0.0
        
        # Test 6: Test divide method (division by zero)
        try:
            result = calc.divide(10, 0)
            # Should handle division by zero gracefully
            if isinstance(result, str) and "Error" in result:
                print("✓ Divide method handles division by zero correctly")
            elif result == float('inf') or result == float('-inf'):
                print("✓ Divide method handles division by zero (returns infinity)")
            else:
                print(f"ERROR: Divide method didn't handle division by zero properly. Got: {result}")
                return 0.0
        except ZeroDivisionError:
            print("✓ Divide method raises ZeroDivisionError (acceptable)")
        except Exception as e:
            print(f"ERROR: Divide method failed on division by zero: {e}")
            return 0.0
        
        # Test 7: Test with different numbers
        try:
            result1 = calc.add(3, 7)
            result2 = calc.subtract(20, 8)
            result3 = calc.multiply(4, 6)
            result4 = calc.divide(15, 3)
            
            if result1 == 10 and result2 == 12 and result3 == 24 and result4 == 5.0:
                print("✓ Calculator works with different numbers")
            else:
                print(f"ERROR: Calculator failed with different numbers")
                return 0.0
        except Exception as e:
            print(f"ERROR: Calculator failed with different numbers: {e}")
            return 0.0
        
        print("✓ All tests passed!")
        return 1.0
        
    except Exception as e:
        print(f"ERROR: Test suite failed with exception: {e}")
        return 0.0

if __name__ == "__main__":
    result = test_calculator_class()
    sys.exit(0 if result == 1.0 else 1)