Pytest MCP Server

import pytest import tkinter as tk from src.calculator_app import Calculator @pytest.fixture def calculator(): """Create a calculator instance for testing.""" root = tk.Tk() calc = Calculator(root) yield calc root.destroy() class TestBasicOperations: """Test basic arithmetic operations.""" @pytest.mark.ui def test_addition(self, calculator): """Test calculator can add two numbers.""" calculator.append_char('5') calculator.append_char('+') calculator.append_char('3') calculator.calculate() assert calculator.get_display_text() == '8' assert calculator.result == 8 @pytest.mark.ui def test_subtraction(self, calculator): """Test calculator can subtract numbers.""" calculator.append_char('1') calculator.append_char('0') calculator.append_char('-') calculator.append_char('4') calculator.calculate() assert calculator.get_display_text() == '6' assert calculator.result == 6 @pytest.mark.ui def test_multiplication(self, calculator): """Test calculator can multiply numbers.""" calculator.append_char('6') calculator.append_char('*') calculator.append_char('7') calculator.calculate() assert calculator.get_display_text() == '42' assert calculator.result == 42 @pytest.mark.ui def test_division(self, calculator): """Test calculator can divide numbers.""" calculator.append_char('2') calculator.append_char('0') calculator.append_char('/') calculator.append_char('4') calculator.calculate() assert calculator.get_display_text() == '5.0' assert calculator.result == 5.0 @pytest.mark.ui @pytest.mark.error_handling def test_division_by_zero(self, calculator): """Test calculator handles division by zero correctly.""" calculator.append_char('1') calculator.append_char('0') calculator.append_char('/') calculator.append_char('0') calculator.calculate() display_text = calculator.get_display_text() assert "Error" in display_text or "Division by zero" in display_text class TestAdvancedOperations: """Test advanced calculator features.""" @pytest.mark.ui def test_square_root(self, calculator): """Test square root calculation.""" calculator.current_input = '16' calculator.update_display('16') calculator.square_root() assert calculator.get_display_text() == '4.0' assert calculator.result == 4.0 @pytest.mark.ui @pytest.mark.error_handling def test_square_root_negative(self, calculator): """Test square root of negative number shows error.""" calculator.current_input = '-9' calculator.update_display('-9') calculator.square_root() display_text = calculator.get_display_text() assert "Error" in display_text @pytest.mark.ui def test_decimal_operations(self, calculator): """Test calculator works with decimal numbers.""" calculator.append_char('3') calculator.append_char('.') calculator.append_char('5') calculator.append_char('+') calculator.append_char('2') calculator.append_char('.') calculator.append_char('5') calculator.calculate() assert float(calculator.get_display_text()) == 6.0 class TestUIFunctions: """Test UI control functions.""" @pytest.mark.ui def test_clear_function(self, calculator): """Test clear button resets calculator.""" calculator.append_char('1') calculator.append_char('2') calculator.append_char('3') calculator.clear() assert calculator.get_display_text() == '0' assert calculator.current_input == '' @pytest.mark.ui def test_clear_entry(self, calculator): """Test clear entry removes current input.""" calculator.append_char('4') calculator.append_char('5') calculator.append_char('6') calculator.clear_entry() assert calculator.get_display_text() == '0' assert calculator.current_input == '' @pytest.mark.ui def test_backspace(self, calculator): """Test backspace removes last character.""" calculator.append_char('1') calculator.append_char('2') calculator.append_char('3') calculator.backspace() assert calculator.current_input == '12' assert calculator.get_display_text() == '12' @pytest.mark.ui def test_multiple_operations(self, calculator): """Test chaining multiple operations.""" calculator.append_char('5') calculator.append_char('+') calculator.append_char('3') calculator.calculate() # Result is 8, now multiply by 2 calculator.append_char('*') calculator.append_char('2') calculator.calculate() assert calculator.get_display_text() == '16' class TestEdgeCases: """Test edge cases and error conditions.""" @pytest.mark.ui @pytest.mark.slow def test_very_large_numbers(self, calculator): """Test calculator handles large numbers.""" calculator.current_input = '999999999' calculator.append_char('+') calculator.append_char('1') calculator.calculate() assert calculator.result == 1000000000 @pytest.mark.ui def test_zero_operations(self, calculator): """Test operations with zero.""" calculator.append_char('0') calculator.append_char('+') calculator.append_char('0') calculator.calculate() assert calculator.result == 0 @pytest.mark.ui @pytest.mark.error_handling def test_invalid_expression(self, calculator): """Test calculator handles invalid expressions.""" calculator.current_input = '5++' calculator.calculate() display_text = calculator.get_display_text() assert "Error" in display_text