address review comments

Author: jdpedrie

cloud_sql/postgres/pdo/README.md

@@ -70,7 +70,7 @@ Navigate towards http://localhost:8080 to verify your application is running cor
 
 To run on App Engine Flex, create an App Engine project by following the setup for these [instructions](https://cloud.google.com/appengine/docs/standard/php7/quickstart#before-you-begin).
 
-First, update `app.yaml` with the correct values to pass the environment variables into the runtime.
+First, update `app.flex.yaml` with the correct values to pass the environment variables into the runtime.
 
 Then, make sure that the service account `service-{PROJECT_NUMBER}>@gae-api-prod.google.com.iam.gserviceaccount.com` has the IAM role `Cloud SQL Client`.
 

cloud_sql/postgres/pdo/app.yaml cloud_sql/postgres/pdo/app.flex.yamlcloud_sql/postgres/pdo/app.yaml renamed to cloud_sql/postgres/pdo/app.flex.yaml

@@ -17,8 +17,5 @@
         "pimple/pimple": "^3.3",
         "guzzlehttp/psr7": "^1.6",
         "http-interop/http-factory-guzzle": "^1.0"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "^8.5"
     }
 }

cloud_sql/postgres/pdo/composer.json

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit colors="true">
+<phpunit colors="true" bootstrap="../../../testing/bootstrap.php">
   <testsuites>
     <testsuite name="CloudSQLPostgresSample">
       <directory>tests</directory>