diff --git a/test/models/availability_test.rb b/test/models/availability_test.rb
index 53d48faf7..e7b35b388 100644
--- a/test/models/availability_test.rb
+++ b/test/models/availability_test.rb
@@ -6,4 +6,10 @@ class AvailabilityTest < ActiveSupport::TestCase
     assert a.invalid?
     assert a.errors.key?(:end_at)
   end
+
+  test "if type available_type is 'machines' check that there is minimum 1 association" do
+    a = Availability.new(start_at: Time.now, end_at: 2.hours.from_now, available_type: 'machines')
+    assert a.invalid?
+    assert a.errors.key?(:machine_ids)
+  end
 end