added dockerignore to template; add unit test

app/index.js

@@ -110,6 +110,7 @@ module.exports = class extends Generator {
     this.fs.copyTpl(this.templatePath('test/test-server.js'), this.destinationPath('test/test-server.js'), this.options);
     this.fs.copyTpl(this.templatePath('test/test-demo.js'), this.destinationPath('test/test-demo.js'), this.options);
     this.fs.copyTpl(this.templatePath('_gitignore'), this.destinationPath('.gitignore'), this.options);
+    this.fs.copyTpl(this.templatePath('_dockerignore'), this.destinationPath('.dockerignore'), this.options);
     this.fs.copyTpl(this.templatePath('cli-config.yml'), this.destinationPath('cli-config.yml'), this.options);
     this.fs.copyTpl(this.templatePath('Dockerfile'), this.destinationPath('Dockerfile'), this.options);
     this.fs.copyTpl(this.templatePath('Dockerfile-tools'), this.destinationPath('Dockerfile-tools'), this.options);

test/common.js

@@ -19,6 +19,7 @@
 // Paths to the generated files, if you move files around change paths here.
 exports.file = {
   gitignore: '.gitignore',
+  dockerignore: '.dockerignore',
   package_json: 'package.json',
   README_md: 'README.md',
   server_js: 'server/server.js',

test/integration.js

@@ -295,6 +295,12 @@ describe('core-node-express:app integration test with custom bluemix and spec',
       assert.fileContent(common.file.gitignore, 'node_modules');
     });
   });
+
+  describe(common.file.dockerignore, function () {
+    it('contains node_modules', function () {
+      assert.fileContent(common.file.dockerignore, 'node_modules');
+    });
+  });
 });
 
 describe('core-node-express:app integration test with isDeployableContainer spec', function() {