Unit-testing Bref lambda handlers

Hopefully this helps someone out there unit-testing Bref lambda consumers (eg. AWS lambda handlers for SNS / EventBridge / SQS, etc) with PHPUnit;

Essentially this includes the consumer (which is essentially a PHP function), and calls the function with array of event-data (in the same format AWS would normally give it).

The function (handler) would then return a response (hopefully with no thrown errors), and any unit-testing on the result would be done.

public function testConsumeUpdatePerson() {
        $handler = include(__DIR__ . '/../bin/consume');

        $data = json_encode([
            'action' => 'update-person',
            'id' => 1234
        ]);
        $overallJson = '{
  "Records": [
    {
      "EventVersion": "1.0",
      "EventSubscriptionArn": "arn:aws:sns:us-east-2:123456678:sns-lambda:abc-123",
      "EventSource": "aws:sns",
      "Sns": {
        "SignatureVersion": "1",
        "Timestamp": "2019-01-02T12:45:07.000Z",
        "Signature": "aaaabbbb/ccccdddd/111111==",
        "SigningCertUrl": "https://sns.us-east-2.amazonaws.com/SimpleNotificationService-aaaabbbb.pem",
        "MessageId": "aaaabbbbb",
        "Message": "' . addslashes($data) . '",
        "MessageAttributes": {
          "Test": {
            "Type": "String",
            "Value": "TestString"
          },
          "TestBinary": {
            "Type": "Binary",
            "Value": "TestBinary"
          }
        },
        "Type": "Notification",
        "UnsubscribeUrl": "https://sns.us-east-2.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-east-2:111122222:test-lambda:aaaaa-bbbbb",
        "TopicArn" : "arn:aws:sns:ap-southeast-2:1111222222:topic-name-goes-here",
        "Subject": "TestInvoke"
      }
    }
  ]
}';
        $event = json_decode($overallJson, true);

        $response = $handler($event, new Context('', 300, '', ''));
        $this->assertEquals('OK', $response);
    }

More unit-tests can obviously be added below, but the basics of this test that there’s no errors, unhandled exceptions, etc which you hadn’t fully tested otherwise