test: favor `===` over `==` in crypto tests

PR-URL: https://github.com/nodejs/node/pull/8176
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

test/parallel/test-crypto-authenticated.js

@@ -312,7 +312,7 @@ var ciphers = crypto.getCiphers();
 for (var i in TEST_CASES) {
   var test = TEST_CASES[i];
 
-  if (ciphers.indexOf(test.algo) == -1) {
+  if (ciphers.indexOf(test.algo) === -1) {
     common.skip('unsupported ' + test.algo + ' test');
     continue;
   }

test/parallel/test-crypto-hmac.js

@@ -62,7 +62,7 @@ var wikipedia = [
 for (let i = 0, l = wikipedia.length; i < l; i++) {
   for (const hash in wikipedia[i]['hmac']) {
     // FIPS does not support MD5.
-    if (common.hasFipsCrypto && hash == 'md5')
+    if (common.hasFipsCrypto && hash === 'md5')
       continue;
     const result = crypto.createHmac(hash, wikipedia[i]['key'])
                          .update(wikipedia[i]['data'])

test/pummel/test-crypto-dh.js

@@ -41,7 +41,7 @@ for (const name in hashes) {
 
 for (const name in hashes) {
   // modp1 is 768 bits, FIPS requires >= 1024
-  if (name == 'modp1' && common.hasFipsCrypto)
+  if (name === 'modp1' && common.hasFipsCrypto)
     continue;
   var group1 = crypto.getDiffieHellman(name);
   var group2 = crypto.getDiffieHellman(name);