customize testing files to account for integration test

because this plugin needs another container for an integration
test we're adding here the necessary tweaks for this setup:

'run.sh' will run both normal and integration tests
'setup.sh' will fetch the postgres driver from within the logstash container
'docker-compose.override.yml' adds the postgres container

Author: jsvd

.ci/docker-compose.override.yml

@@ -0,0 +1,20 @@
+version: '3'
+
+services:
+
+  logstash:
+    environment:
+      LS_JAVA_OPTS: "-Xmx256m -Xms256m"
+      LOGSTASH_SOURCE: 1
+      PG_CONNECTION_STRING: "jdbc:postgresql://postgresql:5432"
+      POSTGRES_PASSWORD: "test_user_password"
+
+  postgresql:
+    image: postgres:latest
+    environment:
+      POSTGRES_PASSWORD: "test_user_password"
+    volumes:
+    - ./setup.sql:/docker-entrypoint-initdb.d/init.sql
+    ports:
+      - 5432:5432
+

.ci/run.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+# This is intended to be run inside the docker container as the command of the docker-compose.
+set -ex
+
+export USER='logstash'
+
+bundle exec rspec spec && bundle exec rspec spec --tag integration

.ci/setup.sh

@@ -0,0 +1 @@
+curl -o /usr/share/logstash/postgresql.jar https://jdbc.postgresql.org/download/postgresql-42.2.8.jar

.ci/setup.sql

@@ -0,0 +1,59 @@
+create database jdbc_streaming_db;
+
+\c jdbc_streaming_db;
+
+
+create table reference_table (
+    ip VARCHAR(50) NOT NULL,
+    name VARCHAR(50) NOT NULL,
+    location VARCHAR(50) NOT NULL
+);
+
+
+DO $$
+    DECLARE
+        counter INTEGER := 1 ;
+        ipTemplate VARCHAR(50)    := '10.%s.1.1';
+        nameTemplate VARCHAR(50) := 'ldn-server-%s';
+        locationTemplate VARCHAR(50) := 'LDN-%s-2-3';
+    BEGIN
+
+        WHILE counter <= 250
+            LOOP
+                INSERT INTO reference_table
+                VALUES ((SELECT FORMAT(ipTemplate, counter)),
+                        (SELECT FORMAT(nameTemplate, counter)),
+                        (SELECT FORMAT(locationTemplate, counter)));
+                counter = counter + 1;
+            END LOOP;
+END $$;
+
+
+create database jdbc_static_db;
+
+\c jdbc_static_db;
+
+
+create table reference_table (
+    ip VARCHAR(50) NOT NULL,
+    name VARCHAR(50) NOT NULL,
+    location VARCHAR(50) NOT NULL
+);
+
+
+INSERT INTO reference_table VALUES ('10.1.1.1', 'ldn-server-1', 'LDN-2-3-4');
+INSERT INTO reference_table VALUES ('10.2.1.1', 'nyc-server-1', 'NYC-5-2-8');
+INSERT INTO reference_table VALUES ('10.3.1.1', 'mv-server-1', 'MV-9-6-4');
+
+create DATABASE jdbc_input_db;
+
+\c jdbc_input_db;
+
+CREATE TABLE employee (
+    emp_no integer NOT NULL,
+    first_name VARCHAR (50) NOT NULL,
+    last_name VARCHAR (50) NOT NULL
+);
+
+INSERT INTO employee VALUES (1, 'David', 'Blenkinsop');
+INSERT INTO employee VALUES (2, 'Mark', 'Guckenheimer');