tests(unit): improve coverage for crypto util

Author: jankapunkt

test/unit/utils/crypto-util_test.js

@@ -0,0 +1,18 @@
+const cryptoUtil = require('../../../lib/utils/crypto-util');
+require('chai').should();
+
+describe(cryptoUtil.createHash.name, function () {
+  it('creates a hash by given algorithm', function () {
+    const data = 'client-credentials-grant';
+    const hash = cryptoUtil.createHash({ data, encoding: 'hex' });
+    hash.should.equal('072726830f0aadd2d91f86f53e3a7ef40018c2626438152dd576e272bf2b8e60');
+  });
+  it('should throw if data is missing', function () {
+    try {
+      cryptoUtil.createHash({});
+    } catch (e) {
+      e.should.be.instanceOf(TypeError);
+      e.message.should.include('he "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView.');
+    }
+  });
+});