test: improve test for crypto pbkdf2

- use assert.strictEqual instead of assert.equal
- add regexp for assert.throws

PR-URL: nodejs#9883
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-crypto-pbkdf2.js

@@ -13,10 +13,10 @@ var crypto = require('crypto');
 //
 function testPBKDF2(password, salt, iterations, keylen, expected) {
   var actual = crypto.pbkdf2Sync(password, salt, iterations, keylen, 'sha256');
-  assert.equal(actual.toString('latin1'), expected);
+  assert.strictEqual(actual.toString('latin1'), expected);
 
   crypto.pbkdf2(password, salt, iterations, keylen, 'sha256', (err, actual) => {
-    assert.equal(actual.toString('latin1'), expected);
+    assert.strictEqual(actual.toString('latin1'), expected);
   });
 }
 
@@ -47,43 +47,43 @@ testPBKDF2('pass\0word', 'sa\0lt', 4096, 16,
 var expected =
     '64c486c55d30d4c5a079b8823b7d7cb37ff0556f537da8410233bcec330ed956';
 var key = crypto.pbkdf2Sync('password', 'salt', 32, 32, 'sha256');
-assert.equal(key.toString('hex'), expected);
+assert.strictEqual(key.toString('hex'), expected);
 
 crypto.pbkdf2('password', 'salt', 32, 32, 'sha256', common.mustCall(ondone));
 function ondone(err, key) {
   if (err) throw err;
-  assert.equal(key.toString('hex'), expected);
+  assert.strictEqual(key.toString('hex'), expected);
 }
 
 // Error path should not leak memory (check with valgrind).
 assert.throws(function() {
   crypto.pbkdf2('password', 'salt', 1, 20, null);
-});
+}, /^Error: No callback provided to pbkdf2$/);
 
 // Should not work with Infinity key length
 assert.throws(function() {
   crypto.pbkdf2('password', 'salt', 1, Infinity, 'sha256', common.fail);
-}, /Bad key length/);
+}, /^TypeError: Bad key length$/);
 
 // Should not work with negative Infinity key length
 assert.throws(function() {
   crypto.pbkdf2('password', 'salt', 1, -Infinity, 'sha256', common.fail);
-}, /Bad key length/);
+}, /^TypeError: Bad key length$/);
 
 // Should not work with NaN key length
 assert.throws(function() {
   crypto.pbkdf2('password', 'salt', 1, NaN, 'sha256', common.fail);
-}, /Bad key length/);
+}, /^TypeError: Bad key length$/);
 
 // Should not work with negative key length
 assert.throws(function() {
   crypto.pbkdf2('password', 'salt', 1, -1, 'sha256', common.fail);
-}, /Bad key length/);
+}, /^TypeError: Bad key length$/);
 
 // Should not work with key length that does not fit into 32 signed bits
 assert.throws(function() {
   crypto.pbkdf2('password', 'salt', 1, 4073741824, 'sha256', common.fail);
-}, /Bad key length/);
+}, /^TypeError: Bad key length$/);
 
 // Should not get FATAL ERROR with empty password and salt
 // https://github.com/nodejs/node/issues/8571