Add prune command test

test/commands/prune_test.rb

@@ -0,0 +1,27 @@
+require "test_helper"
+
+class CommandsPruneTest < ActiveSupport::TestCase
+  setup do
+    @config = {
+      service: "app", image: "dhh/app", registry: { "username" => "dhh", "password" => "secret" }, servers: [ "1.1.1.1" ],
+      traefik: { "args" => { "accesslog.format" => "json", "metrics.prometheus.buckets" => "0.1,0.3,1.2,5.0" } }
+    }
+  end
+
+  test "images" do
+    assert_equal \
+      "docker image prune --force --filter until=168h",
+      new_command.images.join(" ")
+  end
+
+  test "containers" do
+    assert_equal \
+      "docker image prune --force --filter until=168h",
+      new_command.images.join(" ")
+  end
+
+  private
+    def new_command
+      Mrsk::Commands::Prune.new(Mrsk::Configuration.new(@config, version: "123"))
+    end
+end