Add controller tests for undo

test/controllers/commands/undos_controller_test.rb

@@ -0,0 +1,19 @@
+require "test_helper"
+
+class UndosControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in_as :jz
+  end
+
+  test "undo and destroy a command" do
+    assert_includes cards(:logo).reload.assignees, users(:jz)
+
+    assert_difference -> { users(:jz).commands.reload.count }, -1 do
+      post command_undo_path(commands(:logo_assign_to_jz_command)), headers: { "HTTP_REFERER" => cards_path }
+    end
+
+    assert_not_includes cards(:logo).reload.assignees, users(:jz)
+
+    assert_redirected_to cards_path
+  end
+end

test/fixtures/commands.yml

@@ -0,0 +1,10 @@
+logo_assign_to_jz_command:
+  user: jz
+  type: Command::Assign
+  data: <%= {
+    card_ids: [ ActiveRecord::FixtureSet.identify(:logo) ],
+    assignee_ids: [ ActiveRecord::FixtureSet.identify(:jz) ],
+    toggled_assignees_by_card: {
+      ActiveRecord::FixtureSet.identify(:logo) => [ ActiveRecord::FixtureSet.identify(:jz) ]
+    }
+  }.to_json %>