fix(devServer.cert): accepting proper types in cert,key and ca fields

Author: Karol Maciaszek

src/properties/devServer/index.js

@@ -10,9 +10,12 @@ export default Joi.object({
   info: Joi.boolean(),
   quiet: Joi.boolean(),
   https: Joi.boolean(),
-  key: Joi.string(),
-  cert: Joi.string(),
-  cacert: Joi.string(),
+  key: Joi.binary(),
+  cert: Joi.binary(),
+  ca: [
+    Joi.binary(),
+    Joi.array().items(Joi.binary()),
+  ],
   contentBase: [
     Joi.object(),
     Joi.array(),

src/properties/devServer/index.test.js

@@ -10,9 +10,12 @@ const validModuleConfigs = [
   { input: { info: true } },
   { input: { quiet: true } },
   { input: { https: true } },
-  { input: { key: '/path/to/key' } },
-  { input: { cert: 'path/to/cert' } },
-  { input: { cacert: 'path/to/cacert' } },
+  { input: { key: 'key contents' } },
+  { input: { key: new Buffer('key contents') } },
+  { input: { cert: 'cert contents' } },
+  { input: { cert: new Buffer('cert contents') } },
+  { input: { ca: 'ca contents' } },
+  { input: { ca: ['ca contents 1', new Buffer('ca contents 2')] } },
   { input: { contentBase: '/content/base' } },
   { input: { contentBase: { target: '/content/base/' } } },
   { input: { contentBase: ['/content/base/'] } },