diff --git a/packages/server/__mocks__/pg.ts b/packages/server/__mocks__/pg.ts
index 0ec823ea39..ba7803f9a8 100644
--- a/packages/server/__mocks__/pg.ts
+++ b/packages/server/__mocks__/pg.ts
@@ -21,15 +21,18 @@ module PgMock {
   function Pool() {
   }
 
+  const on = jest.fn()
   Pool.prototype.query = query
   Pool.prototype.connect = jest.fn(() => {
     // @ts-ignore
     return new Client()
   })
+  Pool.prototype.on = on
 
   pg.Client = Client
   pg.Pool = Pool
   pg.queryMock = query
+  pg.on = on
 
   module.exports = pg
 }
diff --git a/packages/server/src/integrations/tests/postgres.spec.js b/packages/server/src/integrations/tests/postgres.spec.js
index 4ce5f12e96..5c0d086ce0 100644
--- a/packages/server/src/integrations/tests/postgres.spec.js
+++ b/packages/server/src/integrations/tests/postgres.spec.js
@@ -15,6 +15,10 @@ describe("Postgres Integration", () => {
     config = new TestConfiguration()
   })
 
+  it("calls the connection callback", async () => {
+    expect(pg.on).toHaveBeenCalledWith('connect', expect.anything())
+  })
+
   it("calls the create method with the correct params", async () => {
     const sql = "insert into users (name, age) values ('Joe', 123);"
     await config.integration.create({