README updated, tests for different attr name added

Author: tsmx

README.md

@@ -42,7 +42,7 @@ let verification = objectHmac.verifyHmac(obj, key);
 // true
 ```
 
-### Only calculate HMAC for an object
+### Only calculate HMAC for a JSON object
 
 ```js
 const objectHmac = require('@tsmx/object-hmac');

test/object-hmac.test.js

@@ -3,6 +3,8 @@ describe('object-hmac test suite', () => {
     const objectHmac = require('../object-hmac');
     const testKey = 'HmacSecret-0815';
     const testHmac = 'bb83e36f2c030af71803fd6a82b49ea638944bb6638351754a967f4f5638ac3b';
+    const testHmacAttribute = '__hmac';
+    const testHmacAttributeDifferent = '_signature';
     var testObjects = null;
 
     beforeEach(() => {
@@ -18,9 +20,17 @@ describe('object-hmac test suite', () => {
 
     it('tests a successful HMAC creation for an object', async (done) => {
         let obj = testObjects.testObject;
-        expect(obj['__hmac']).toBeUndefined();
+        expect(obj[testHmacAttribute]).toBeUndefined();
         objectHmac.createHmac(obj, testKey);
-        expect(obj['__hmac']).toStrictEqual(testHmac);
+        expect(obj[testHmacAttribute]).toStrictEqual(testHmac);
+        done();
+    });
+
+    it('tests a successful HMAC creation for an object with a different attribute name', async (done) => {
+        let obj = testObjects.testObject;
+        expect(obj[testHmacAttributeDifferent]).toBeUndefined();
+        objectHmac.createHmac(obj, testKey, testHmacAttributeDifferent);
+        expect(obj[testHmacAttributeDifferent]).toStrictEqual(testHmac);
         done();
     });
 
@@ -29,6 +39,16 @@ describe('object-hmac test suite', () => {
         done();
     });
 
+    it('test a successful HMAC verification with a different attribute name', async (done) => {
+        expect(objectHmac.verifyHmac(testObjects.testObjectWithHmacDifferentAttribute, testKey, testHmacAttributeDifferent)).toBeTruthy();
+        done();
+    });
+
+    it('test a failed HMAC verification - different attribute name', async (done) => {
+        expect(objectHmac.verifyHmac(testObjects.testObjectWithHmac, testKey, testHmacAttributeDifferent)).toBeFalsy();
+        done();
+    });
+
     it('test a failed HMAC verification - no HMAC provided for object', async (done) => {
         expect(objectHmac.verifyHmac(testObjects.testObject, testKey)).toBeFalsy();
         done();

test/testobjects.js

@@ -21,6 +21,18 @@ module.exports.testObjectWithHmac =
     __hmac: 'bb83e36f2c030af71803fd6a82b49ea638944bb6638351754a967f4f5638ac3b'
 }
 
+module.exports.testObjectWithHmacDifferentAttribute =
+{
+    title: 'Test-Object',
+    numbers: [1, 12, 123],
+    subObject: {
+        name: 'Max',
+        age: 32,
+        hobbies: ['sports', 'travelling']
+    },
+    _signature: 'bb83e36f2c030af71803fd6a82b49ea638944bb6638351754a967f4f5638ac3b'
+}
+
 module.exports.testObjectChangedAttribute =
 {
     title: 'Test-ObjectX',