check that failure message is passed through response

lib/index.js

@@ -94,7 +94,11 @@ export default function slackin({
 
     let chanId = slack.channel ? slack.channel.id : null;
     invite({ token, org, email, channel: chanId }, function(err){
-      if (err) return next(err);
+      if (err) {
+        return res
+        .status(400)
+        .send({ msg: err.message });
+      }
       res.status(200).end();
     });
   });

test/index.js

@@ -4,14 +4,8 @@ import slackin from '../lib/index';
 
 describe('slackin', () => {
   describe('POST /invite', () => {
-    it("returns success for a successful invite", (done) => {
-      let opts = {
-        token: 'mytoken',
-        org: 'myorg'
-      };
-
-      // TODO simplify mocking
-      nock(`https://${opts.org}.slack.com`)
+    let mockNumUsers = (org) => {
+      nock(`https://${org}.slack.com`)
         .get('/api/rtm.start?token=mytoken')
         .reply(200, {
           team: {
@@ -20,7 +14,16 @@ describe('slackin', () => {
           },
           users: [{}]
         });
+    };
+
+    it("returns success for a successful invite", (done) => {
+      let opts = {
+        token: 'mytoken',
+        org: 'myorg'
+      };
 
+      // TODO simplify mocking
+      mockNumUsers(opts.org);
       nock(`https://${opts.org}.slack.com`)
         .post('/api/users.admin.invite')
         .reply(200, { ok: true });
@@ -34,5 +37,30 @@ describe('slackin', () => {
         .expect(200, {})
         .end(done);
     });
+
+    it("returns a failure for a failure message", (done) => {
+      let opts = {
+        token: 'mytoken',
+        org: 'myorg'
+      };
+
+      // TODO simplify mocking
+      mockNumUsers(opts.org);
+      nock(`https://${opts.org}.slack.com`)
+        .post('/api/users.admin.invite')
+        .reply(200, {
+          ok: false,
+          error: "other error"
+        });
+
+      let app = slackin(opts);
+
+      request(app)
+        .post('/invite')
+        .send({ email: '[email protected]' })
+        // .expect('Content-Type', /json/)
+        .expect(400, { msg: "other error" })
+        .end(done);
+    });
   });
 });