Add tests to enforce version sameness

The following files should always contain the same version number:
- package.json
- package-lock.json
- node-invoker.yaml

In addition, these versions should match the tag (when tagged).

Fixes #53

Author: scothis

package-lock.json

@@ -22,6 +22,7 @@
     "eslint": "^4.17.0",
     "eslint-plugin-jasmine": "^2.9.2",
     "jasmine": "^3.1.0",
+    "js-yaml": "^3.11.0",
     "supertest": "^3.0.0",
     "wait-for-port": "0.0.2"
   }

package.json

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const fs = require('fs');
+const path = require('path');
+const yaml = require('js-yaml');
+
+fdescribe('version', () => {
+
+    const { version } = require('../package.json');
+
+    it('matches the package lock version', async () => {
+        const packageLock = require('../package-lock.json');
+        expect(packageLock.version).toBe(version);
+    });
+
+    it('matches the invoker.yaml version', async () => {
+        const filepath = path.resolve(__dirname, '..', 'node-invoker.yaml');
+        const invokerResource = yaml.safeLoad(fs.readFileSync(filepath, 'utf8'));
+        expect(invokerResource.spec.version).toBe(version);
+    });
+
+    if (process.env.TRAVIS_TAG) {
+        it('matches the tag name', () => {
+            expect(process.env.TRAVIS_TAG).toBe(`v${version}`);
+        });
+    }
+
+});