Add test to make sure all clients can be instantiated

codecov.yml

@@ -2,4 +2,4 @@ coverage:
   status:
     project:
       default:
-        target: 90.5%
+        target: 95%

test/clients.spec.js

@@ -0,0 +1,30 @@
+var AWS = require('../index');
+var metadata = require('../apis/metadata');
+var apiLoader = require('../lib/api_loader');
+var customConstructorArgs = {
+  CloudSearchDomain: {endpoint: 'http://localhost:1337'},
+  IotData: {endpoint: 'http://localhost:1337'}
+};
+
+for (var serviceAbbreviation in metadata) {
+  var clientName = metadata[serviceAbbreviation].name;
+  describe(
+    'Instantiating AWS.' + clientName + ' clients',
+    (function(clientName, serviceAbbreviation) {
+      return function() {
+        for (var version in apiLoader.services[serviceAbbreviation]) {
+          it(
+            'can instantiate AWS.' + clientName + ' clients with version ' + version,
+            (function (clientName, version) {
+              return function () {
+                var params = customConstructorArgs[clientName] || {};
+                params.version = version;
+                var c = new AWS[clientName](params);
+              };
+            })(clientName, version)
+          );
+        }
+      }
+    })(clientName, serviceAbbreviation)
+  );
+}