Convert specs to tests

#792

test/models/domain/deletable_test.rb

@@ -0,0 +1,14 @@
+require 'test_helper'
+
+class DomainDeletableTest < ActiveSupport::TestCase
+  def setup
+    @domain = domains(:shop)
+  end
+
+  def test_discard
+    refute @domain.discarded?
+    @domain.discard
+    @domain.reload
+    assert @domain.discarded?
+  end
+end