feat: Add parseQueryString function and tests

package.json

@@ -1,5 +1,11 @@
 {
   "dependencies": {
     "axios": "^0.21.4"
+  },
+  "devDependencies": {
+    "jest": "^29.7.0"
+  },
+  "scripts": {
+    "test": "jest"
   }
 }

scripts/utils.js

@@ -0,0 +1,19 @@
+function parseQueryString(queryString) {
+  if (!queryString) {
+    return {};
+  }
+
+  const pairs = queryString.replace(/^\?/, '').split('&');
+  const result = {};
+
+  for (let i = 0; i < pairs.length; i++) {
+    const pair = pairs[i].split('=');
+    result[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1] || '');
+  }
+
+  return result;
+}
+
+module.exports = {
+  parseQueryString,
+};

scripts/utils.test.js

@@ -0,0 +1,27 @@
+const { parseQueryString } = require('./utils');
+
+describe('parseQueryString', () => {
+  test('should return an empty object for an empty string', () => {
+    expect(parseQueryString('')).toEqual({});
+  });
+
+  test('should parse a single key-value pair', () => {
+    expect(parseQueryString('?foo=bar')).toEqual({ foo: 'bar' });
+  });
+
+  test('should parse multiple key-value pairs', () => {
+    expect(parseQueryString('?foo=bar&baz=qux')).toEqual({ foo: 'bar', baz: 'qux' });
+  });
+
+  test('should handle a key with no value', () => {
+    expect(parseQueryString('?foo=')).toEqual({ foo: '' });
+  });
+
+  test('should handle a key with no value and other keys', () => {
+    expect(parseQueryString('?foo=&baz=qux')).toEqual({ foo: '', baz: 'qux' });
+  });
+
+  test('should handle URI encoded characters', () => {
+    expect(parseQueryString('?foo=bar%20baz')).toEqual({ foo: 'bar baz' });
+  });
+});