Test Postgres and add a test matrix on Travis

Author: lipanski

.travis.yml

@@ -1,6 +1,11 @@
----
+dist: bionic
 language: ruby
+addons:
+  postgresql: "9.6"
+rvm: 2.7.1
 cache: bundler
-rvm:
-  - 2.7.1
 before_install: gem install bundler -v 2.1.4
+before_script: psql -U postgres -c 'create database sql_spy_test;'
+env:
+  - DATABASE_URL=sqlite3:///tmp/sql_spy_test.sqlite3
+  - DATABASE_URL=postgres://postgres/sql_spy_test

Gemfile

@@ -5,5 +5,6 @@ gemspec
 gem "rake", "~> 12.0"
 gem "minitest", "~> 5.0"
 gem "activerecord", "~> 6.0"
+gem "pg"
 gem "sqlite3"
 gem "byebug"

Gemfile.lock

@@ -22,6 +22,7 @@ GEM
     i18n (1.8.5)
       concurrent-ruby (~> 1.0)
     minitest (5.14.2)
+    pg (1.2.3)
     rake (12.3.3)
     sqlite3 (1.4.2)
     thread_safe (0.3.6)
@@ -36,6 +37,7 @@ DEPENDENCIES
   activerecord (~> 6.0)
   byebug
   minitest (~> 5.0)
+  pg
   rake (~> 12.0)
   sql_spy!
   sqlite3

test/sql_spy_test.rb

@@ -1,19 +1,26 @@
 require "minitest/autorun"
 require "active_record"
+require "pg"
 require "sqlite3"
 
 SQLITE_DATABASE = File.expand_path("../test.sqlite3", __dir__)
 File.delete(SQLITE_DATABASE) if File.file?(SQLITE_DATABASE)
 
-ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: SQLITE_DATABASE)
+ENV["DATABASE_URL"] ||= "sqlite3://" + SQLITE_DATABASE
+ActiveRecord::Base.establish_connection(ENV["DATABASE_URL"])
+
 ActiveRecord::Schema.define do
-  create_table :users do |t|
-    t.string :name
+  unless table_exists?(:users)
+    create_table :users do |t|
+      t.string :name
+    end
   end
 
-  create_table :posts do |t|
-    t.references :user
-    t.string :title
+  unless table_exists?(:posts)
+    create_table :posts do |t|
+      t.references :user
+      t.string :title
+    end
   end
 end