project: testing (#15)

testing/src/index.js

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+import { calculator } from './odinTests';
+
+console.log(calculator(1, 2, '+'));

testing/src/odinTests.js

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+const capitalize = (thing) => thing.charAt(0).toUpperCase() + thing.slice(1);
+const reverseString = (thing) => thing.split('').reverse().join('');
+const calculator = (a, b, operation) => {
+    switch (operation) {
+        case '+':
+            return a + b;
+        case '-':
+            return a - b;
+        case '*':
+            return a * b;
+        case '/':
+            if (b === 0) {
+                return 'error';
+            }
+            return a / b;
+    }
+};
+
+const ceaserCipher = (thing) => {
+    let cipher = thing.split('').map((item) => {
+        let charCode = item.charCodeAt(0);
+        return String.fromCharCode(charCode + 3);
+    });
+
+    return cipher.join('');
+};
+
+const analyzeArray = (arr) => {
+    let min = Math.min(...arr);
+    let max = Math.max(...arr);
+    let length = arr.length;
+    let avg = arr.reduce((sum, num) => sum + num, 0) / length;
+
+    return {
+        average: avg,
+        min: min,
+        max: max,
+        length: length,
+    };
+};
+
+export { analyzeArray, ceaserCipher, calculator, capitalize, reverseString };

testing/src/odinTests.test.js

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+import {
+    analyzeArray,
+    ceaserCipher,
+    calculator,
+    reverseString,
+    capitalize,
+} from './odinTests';
+
+test('make sure mike = Mike', () => {
+    expect(capitalize('mike')).toBe('Mike');
+});
+
+test('make sure mike = ekim', () => {
+    expect(reverseString('mike')).toBe('ekim');
+});
+
+test('Make sure calculator works', () => {
+    expect(calculator(1, 2, '+')).toBe(3);
+    expect(calculator(1, 2, '-')).toBe(-1);
+    expect(calculator(1, 2, '*')).toBe(2);
+    expect(calculator(1, 0, '/')).toBe('error');
+    expect(calculator(1, 2, '/')).toBe(0.5);
+    expect(ceaserCipher('bob')).toBe('ere');
+    expect(analyzeArray([1, 2, 3, 4])).toEqual({
+        average: 2.5,
+        min: 1,
+        max: 4,
+        length: 4,
+    });
+});

testing/src/style.css

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+input {
+    outline: none;
+}
+input:user-invalid {
+    outline: none;
+    border: 3px solid red;
+}
+
+input:valid {
+    outline: none;
+    border: 3px solid green;
+}
+
+span {
+    margin-left: 10px;
+    color: red;
+}

testing/src/sum.js

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+function sum(a, b) {
+    return a + b;
+}
+
+module.exports = sum;

testing/src/sum.test.js

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+const sum = require('./sum');
+
+test('adds 1 + 2 to equal 3', () => {
+    expect(sum(1, 2)).toBe(3);
+});