fixing various babel issues within tests

packages/server/src/api/controllers/datasource.js

@@ -30,9 +30,9 @@ exports.save = async function (ctx) {
   datasource._rev = response.rev
 
   // Drain connection pools when configuration is changed
-  const pool = integrations[datasource.source].pool
-  if (pool) {
-    await pool.end()
+  const source = integrations[datasource.source]
+  if (source && source.pool) {
+    await source.pool.end()
   }
 
   ctx.status = 200

packages/server/src/middleware/tests/authorized.spec.js

@@ -5,7 +5,7 @@ jest.mock("../../environment", () => ({
     prod: false,
     isTest: () => true,
     isProd: () => this.prod,
-    _set: (key, value) => {
+    _set: function(key, value) {
       this.prod = value === "production"
     }
   })

packages/server/src/middleware/tests/resourceId.spec.js

@@ -91,7 +91,7 @@ describe("resourceId middleware", () => {
       .mainResource("custom")
       .subResource("customSub")
       .build()
-    config = new TestConfiguration(middleware)
+    let config = new TestConfiguration(middleware)
     config.setBody({
       custom: "test",
       customSub: "subtest"