feat: 新增 timer.py 计时器程序

test_calculator.py

@@ -0,0 +1,107 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+计算器功能测试
+"""
+
+import sys
+import os
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+from calculator import add, subtract, multiply, divide, calculate
+
+def test_basic_operations():
+    """测试基本运算"""
+    print("测试基本运算...")
+
+    # 测试加法
+    assert add(5, 3) == 8
+    assert add(-2, 3) == 1
+    assert add(0, 0) == 0
+
+    # 测试减法
+    assert subtract(10, 4) == 6
+    assert subtract(3, 7) == -4
+    assert subtract(0, 5) == -5
+
+    # 测试乘法
+    assert multiply(4, 5) == 20
+    assert multiply(-3, 2) == -6
+    assert multiply(0, 100) == 0
+
+    # 测试除法
+    assert divide(10, 2) == 5
+    assert divide(7, 2) == 3.5
+    assert divide(-12, 3) == -4
+
+    print("基本运算测试通过！")
+
+def test_divide_by_zero():
+    """测试除零错误"""
+    print("测试除零错误...")
+    try:
+        divide(5, 0)
+        print("错误: 除零异常未触发")
+        return False
+    except ValueError as e:
+        assert str(e) == "除数不能为零"
+        print("除零错误测试通过！")
+        return True
+
+def test_calculate_function():
+    """测试计算函数"""
+    print("测试calculate函数...")
+
+    # 测试有效表达式
+    assert calculate("5 + 3") == 8
+    assert calculate("10 - 4") == 6
+    assert calculate("4 * 5") == 20
+    assert calculate("10 / 2") == 5
+    assert calculate("7.5 + 2.5") == 10.0
+    assert calculate("-3 * 4") == -12
+
+    # 测试无效表达式
+    test_cases = [
+        ("5 +", "表达式格式错误"),
+        ("+ 3", "表达式格式错误"),
+        ("5 + 3 4", "表达式格式错误"),
+        ("5 & 3", "不支持的运算符"),
+        ("abc + 3", "操作数必须是数字"),
+        ("5 / 0", "除数不能为零"),
+    ]
+
+    for expr, expected_error in test_cases:
+        try:
+            calculate(expr)
+            print(f"错误: 表达式 '{expr}' 应触发错误但未触发")
+            return False
+        except (ValueError, RuntimeError) as e:
+            if expected_error not in str(e):
+                print(f"错误: 表达式 '{expr}' 返回错误 '{e}'，但期望包含 '{expected_error}'")
+                return False
+
+    print("calculate函数测试通过！")
+    return True
+
+def main():
+    """运行所有测试"""
+    print("开始计算器测试...")
+    print("=" * 50)
+
+    try:
+        test_basic_operations()
+        test_divide_by_zero()
+        test_calculate_function()
+
+        print("=" * 50)
+        print("所有测试通过！")
+        return 0
+    except AssertionError as e:
+        print(f"测试失败: {e}")
+        return 1
+    except Exception as e:
+        print(f"测试过程中出现未知错误: {e}")
+        return 1
+
+if __name__ == "__main__":
+    sys.exit(main())