adding test for dependency lock-down

package.json

@@ -90,6 +90,7 @@
     "mocha-sinon": "^2.0.0",
     "pug": "^2.0.0-beta5",
     "pug-loader": "^2.3.0",
+    "semver": "^5.4.1",
     "should": "^13.2.0",
     "sinon": "^4.1.3",
     "style-loader": "^0.19.1",

test/cli.test.js

@@ -3,10 +3,29 @@
 const assert = require('assert');
 const path = require('path');
 const execa = require('execa');
+const semver = require('semver');
+const pkg = require('../package.json');
 const runDevServer = require('./helpers/run-webpack-dev-server');
 
+describe('CLI Dependencies', () => {
+  it('should lock down certain dependencies', () => {
+    const yargs = pkg.dependencies.yargs;
+    // yargs needs to be locked down to 6.6.0
+    semver.satisfies(yargs, '6.6.0');
+  });
+});
+
+describe('CLI', () => {
+  it('--progress', (done) => {
+    runDevServer('--progress')
+      .then((output) => {
+        assert(output.code === 0);
+        assert(output.stderr.indexOf('0% compiling') >= 0);
+        done();
+      })
+      .catch(done);
+  }).timeout(6000);
 
-describe('SIGINT', () => {
   it('should exit the process when SIGINT is detected', (done) => {
     const cliPath = path.resolve(__dirname, '../bin/webpack-dev-server.js');
     const examplePath = path.resolve(__dirname, '../examples/cli/public');
@@ -28,15 +47,3 @@ describe('SIGINT', () => {
     });
   }).timeout(6000);
 });
-
-describe('CLI', () => {
-  it('--progress', (done) => {
-    runDevServer('--progress')
-      .then((output) => {
-        assert(output.code === 0);
-        assert(output.stderr.indexOf('0% compiling') >= 0);
-        done();
-      })
-      .catch(done);
-  }).timeout(6000);
-});