(test) update an availability

app/controllers/api/availabilities_controller.rb

@@ -51,6 +51,7 @@ class API::AvailabilitiesController < API::ApiController
     end
   end
 
+  # This endpoint is used to remove a machine or a plan from the given availability
   def update
     authorize Availability
     if @availability.update(availability_params)

test/integration/availabilities/update_test.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+# module definition
+module Availabilities; end
+
+class Availabilities::UpdateTest < ActionDispatch::IntegrationTest
+  setup do
+    admin = User.with_role(:admin).first
+    login_as(admin, scope: :user)
+  end
+
+  test 'update an availability to remove an associated machine' do
+    availability = Availability.find(4)
+    machine = Machine.find(2)
+    patch "/api/availabilities/#{availability.id}",
+          params: {
+            availability: {
+              machines_attributes: [
+                { id: machine.id, _destroy: true }
+              ]
+            }
+          }
+
+    assert_response :success
+    assert_equal Mime[:json], response.content_type
+
+    res = json_response(response.body)
+    assert_not_includes res[:machine_ids], machine.id
+
+    availability.reload
+
+    assert_empty availability.machines_availabilities.where(machine: machine)
+  end
+end