test: refactor test-crypto-hmac

* replace assert.equals with assert.strictEquals
* use template strings where appropriate

PR-URL: https://github.com/nodejs/node/pull/9958
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-crypto-hmac.js

@@ -13,7 +13,7 @@ var h1 = crypto.createHmac('sha1', 'Node')
                .update('some data')
                .update('to hmac')
                .digest('hex');
-assert.equal(h1, '19fd6e1ba73d9ed2224dd5094a71babe85d9a892', 'test HMAC');
+assert.strictEqual(h1, '19fd6e1ba73d9ed2224dd5094a71babe85d9a892', 'test HMAC');
 
 // Test HMAC (Wikipedia Test Cases)
 var wikipedia = [
@@ -67,9 +67,9 @@ for (let i = 0, l = wikipedia.length; i < l; i++) {
     const result = crypto.createHmac(hash, wikipedia[i]['key'])
                          .update(wikipedia[i]['data'])
                          .digest('hex');
-    assert.equal(wikipedia[i]['hmac'][hash],
-                 result,
-                 'Test HMAC-' + hash + ': Test case ' + (i + 1) + ' wikipedia');
+    assert.strictEqual(wikipedia[i]['hmac'][hash],
+                       result,
+                       `Test HMAC-${hash}: Test case ${i + 1} wikipedia`);
   }
 }
 
@@ -233,10 +233,10 @@ for (let i = 0, l = rfc4231.length; i < l; i++) {
       result = result.substr(0, 32); // first 128 bits == 32 hex chars
       strRes = strRes.substr(0, 32);
     }
-    assert.equal(rfc4231[i]['hmac'][hash],
-                 result,
-                 'Test HMAC-' + hash + ': Test case ' + (i + 1) + ' rfc 4231');
-    assert.equal(strRes, result, 'Should get same result from stream');
+    assert.strictEqual(rfc4231[i]['hmac'][hash],
+                       result,
+                       `Test HMAC-${hash}: Test case ${i + 1} rfc 4231`);
+    assert.strictEqual(strRes, result, 'Should get same result from stream');
   }
 }
 
@@ -356,7 +356,7 @@ if (!common.hasFipsCrypto) {
       crypto.createHmac('md5', rfc2202_md5[i]['key'])
         .update(rfc2202_md5[i]['data'])
         .digest('hex'),
-      'Test HMAC-MD5 : Test case ' + (i + 1) + ' rfc 2202'
+      `Test HMAC-MD5 : Test case ${i + 1} rfc 2202`
     );
   }
 }
@@ -366,6 +366,6 @@ for (let i = 0, l = rfc2202_sha1.length; i < l; i++) {
     crypto.createHmac('sha1', rfc2202_sha1[i]['key'])
       .update(rfc2202_sha1[i]['data'])
       .digest('hex'),
-    'Test HMAC-SHA1 : Test case ' + (i + 1) + ' rfc 2202'
+    `Test HMAC-SHA1 : Test case ${i + 1} rfc 2202`
   );
 }