Finish lab3

Author: YingMuo

lab3/main_test.js

@@ -3,3 +3,83 @@ const assert = require('assert');
 const { Calculator } = require('./main');
 
 // TODO: write your tests here
+
+const { mock } = require('node:test');
+
+describe('Calculator', () => {
+    it('should throw an error on non-numeric input when calculate exponential of a number', () => {
+        const calculator = new Calculator();
+        const testcases = [
+            { params: 'a', expected: Error('unsupported operand type') },
+            { params: '123abc', expected: Error('unsupported operand type') },
+            { params: '1', expected: Error('unsupported operand type') },
+            { params: '0', expected: Error('unsupported operand type') },
+            { params: true, expected: Error('unsupported operand type') },
+            { params: false, expected: Error('unsupported operand type') },
+            { params: NaN, expected: Error('unsupported operand type') },
+            { params: Infinity, expected: Error('unsupported operand type') },
+            { params: -Infinity, expected: Error('unsupported operand type') },
+        ]
+        for (const testcase of testcases) {
+            assert.throws(() => calculator.exp(testcase.params), testcase.expected);
+        }
+    });
+    it('show throw an error on overflow when calculate exponential of a number', () => {
+        const calculator = new Calculator();
+        mock.method(Math, 'exp', () => Infinity);
+        assert.throws(() => calculator.exp(1), Error('overflow'));
+        mock.reset();
+    });
+    it('should return the exponential of a number', () => {
+        const calculator = new Calculator();
+
+        function getRndInteger(min, max) {
+            return Math.floor(Math.random() * (max - min + 1)) + min;
+        }
+
+        for (let i = 0; i < 20; i++) {
+            const number = getRndInteger(-100, 100);
+            assert.strictEqual(calculator.exp(number), Math.exp(number));
+        }
+    });
+    it('should throw an error on non-numeric input when calculate logarithm of a number', () => {
+        const calculator = new Calculator();
+        const testcases = [
+            { params: 'a', expected: Error('unsupported operand type') },
+            { params: '123abc', expected: Error('unsupported operand type') },
+            { params: '1', expected: Error('unsupported operand type') },
+            { params: '0', expected: Error('unsupported operand type') },
+            { params: true, expected: Error('unsupported operand type') },
+            { params: false, expected: Error('unsupported operand type') },
+            { params: NaN, expected: Error('unsupported operand type') },
+            { params: Infinity, expected: Error('unsupported operand type') },
+            { params: -Infinity, expected: Error('unsupported operand type') },
+        ]
+        for (const testcase of testcases) {
+            assert.throws(() => calculator.log(testcase.params), testcase.expected);
+        }
+    });
+    it('show throw an error on math domain error when calculate logarithm of a number', () => {
+        const calculator = new Calculator();
+
+        mock.method(Math, 'log', () => -Infinity);
+        assert.throws(() => calculator.log(1), Error('math domain error (1)'));
+        mock.reset();
+
+        mock.method(Math, 'log', () => NaN);
+        assert.throws(() => calculator.log(1), Error('math domain error (2)'));
+        mock.reset();
+    });
+    it('should return the logarithm of a number', () => {
+        const calculator = new Calculator();
+
+        function getRndInteger(min, max) {
+            return Math.floor(Math.random() * (max - min + 1)) + min;
+        }
+
+        for (let i = 0; i < 20; i++) {
+            const number = getRndInteger(1, 1000);
+            assert.strictEqual(calculator.log(number), Math.log(number));
+        }
+    });
+});