Add test

app/controllers/cards/drops_controller.rb

@@ -24,9 +24,9 @@ class Cards::DropsController < ApplicationController
 
     def perform_drop_action
       case @drop_target
-        when :considering
+      when :considering
           @card.reconsider
-        when :doing
+      when :doing
           @card.engage
       end
     end

test/controllers/cards/drops_controller_test.rb

@@ -0,0 +1,34 @@
+require "test_helper"
+
+class Cards::DropsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in_as :kevin
+    @card = cards(:logo)
+  end
+
+  test "drop to considering" do
+    assert_changes -> { @card.reload.considering? }, from: false, to: true do
+      post cards_drops_path, params: { dropped_item_id: @card.id, drop_target: "considering" }, as: :turbo_stream
+      assert_column_rerendered("considering")
+    end
+  end
+
+  test "drop to doing" do
+    @card = cards(:text)
+
+    assert_changes -> { @card.reload.doing? }, from: false, to: true do
+      post cards_drops_path, params: { dropped_item_id: @card.id, drop_target: "doing" }, as: :turbo_stream
+      assert_column_rerendered("doing")
+    end
+  end
+
+  test "invalid drop target" do
+    post cards_drops_path, params: { dropped_item_id: @card.id, drop_target: "invalid" }, as: :turbo_stream
+    assert_response :bad_request
+  end
+
+  private
+    def assert_column_rerendered(target)
+      assert_turbo_stream action: :replace, target: "#{target}-cards"
+    end
+end