feat(fn): make missing config fatal

index.js

@@ -14,7 +14,11 @@ const EVENTS = {
   SPAM: 'spamreport'
 }
 
-const { SQS_SUFFIX } = process.env
+const { AUTH, SQS_SUFFIX } = process.env
+
+if (! AUTH || ! SQS_SUFFIX) {
+  throw new Error('Missing config')
+}
 
 const QUEUES = {
   Bounce: `fxa-email-bounce-${SQS_SUFFIX}`,
@@ -33,7 +37,7 @@ async function main (data) {
     // If there's a body, it's a request from the API gateway
     if (data.body) {
       // Requests from the API gateway must be authenticated
-      if (! data.queryStringParameters || data.queryStringParameters.auth !== process.env.AUTH) {
+      if (! data.queryStringParameters || data.queryStringParameters.auth !== AUTH) {
         return {
           statusCode: 401,
           body: 'Unauthorized',

test.js

@@ -18,6 +18,7 @@ suite('fxa-sendgrid-event-proxy:', () => {
   let sqs, proxy
 
   setup(() => {
+    process.env.AUTH = 'authentication string'
     process.env.SQS_SUFFIX = 'wibble'
     sqs = {
       push: sinon.spy()
@@ -466,7 +467,6 @@ suite('fxa-sendgrid-event-proxy:', () => {
 
   suite('call with an authorised request object:', () => {
     setup(done => {
-      process.env.AUTH = 'authentication string'
       proxy.main({
         body: JSON.stringify({
           email: 'foo@example.com',
@@ -512,7 +512,6 @@ suite('fxa-sendgrid-event-proxy:', () => {
     let promise
 
     setup(() => {
-      process.env.AUTH = 'authentication string'
       promise = proxy.main({
         body: JSON.stringify({
           email: 'foo@example.com',