test(defineOperation): add tests for defineOperation

Author: mbroadst

test/defineOperation_tests.js

@@ -0,0 +1,21 @@
+'use strict';
+const kerberos = require('bindings')('kerberos');
+const defineOperation = require('../lib/util').defineOperation;
+const expect = require('chai').expect;
+
+const testMethod = defineOperation(kerberos._testMethod, [
+  { name: 'string', type: 'string' },
+  { name: 'shouldError', type: 'boolean', default: false },
+  { name: 'callback', type: 'function', required: false }
+]);
+
+describe('defineOperation', () => {
+  it('should validate parameters', function() {
+    expect(() => testMethod(42)).to.throw(/Invalid type for parameter/);
+  });
+
+  it('should return a promise if no callback is provided', function() {
+    const promise = testMethod('llamas', false);
+    expect(promise).to.be.instanceOf(Promise);
+  });
+});