Add preliminary test for `DBShell::PostgresClient`

Thinking up an interface for generating command line arguments for the
`psql` command. Based on Django's dbshell:

https://github.com/django/django/blob/66150f7cf61bc09547fa98586790df596eff6d77/tests/dbshell/test_postgresql_psycopg2.py

1 files changed, 23 insertions, 0 deletions

diff --git a/spec/dbshell/postgres_client_spec.rb b/spec/dbshell/postgres_client_spec.rb
new file mode 100644
index 0000000..d1ace86
--- /dev/null
+++ b/spec/dbshell/postgres_client_spec.rb
@@ -0,0 +1,23 @@
+require 'minitest/autorun'
+
+describe DBShell::PostgresClient do
+  describe ".build_command" do
+    DBShell::PostgresClient.build_command({
+      'adapter' => 'postgresql',
+      'host' => 'mailmarehost',
+      'port' => 6027,
+      'username' => 'derpyhooves',
+      'password' => 'somepassword',
+      'database' => 'dbname'
+    }).must_equal([
+      'psql',
+      '-U',
+      'derpyhooves',
+      '-h',
+      'mailmarehost',
+      '-p',
+      '6027',
+      'dbname'
+    ])
+  end
+end