Add all files needed to bring up VM and run agaric.com locally

box/provisioning/roles/geerlingguy.postgresql/tests/README.md

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+# Ansible Role tests
+
+To run the test playbook(s) in this directory:
+
+  1. Install and start Docker.
+  1. Download the test shim (see .travis.yml file for the URL) into `tests/test.sh`:
+    - `wget -O tests/test.sh https://gist.githubusercontent.com/geerlingguy/73ef1e5ee45d8694570f334be385e181/raw/`
+  1. Make the test shim executable: `chmod +x tests/test.sh`.
+  1. Run (from the role root directory) `distro=[distro] playbook=[playbook] ./tests/test.sh`
+
+If you don't want the container to be automatically deleted after the test playbook is run, add the following environment variables: `cleanup=false container_id=$(date +%s)`

box/provisioning/roles/geerlingguy.postgresql/tests/test.yml

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+---
+- hosts: all
+
+  vars:
+    postgresql_databases:
+      - name: example
+    postgresql_users:
+      - name: jdoe
+
+  pre_tasks:
+    - name: Update apt cache.
+      apt: update_cache=yes cache_valid_time=600
+      when: ansible_os_family == 'Debian'
+
+    - name: Set custom variables for old CentOS 6 PostgreSQL install.
+      set_fact:
+        postgresql_hba_entries: []
+        postgresql_global_config_options:
+          - option: unix_socket_directory
+            value: '{{ postgresql_unix_socket_directories[0] }}'
+      when: ansible_os_family == 'RedHat' and ansible_distribution_version.split('.')[0] == '6'
+
+  roles:
+    - role_under_test