Add API for removing card images

test/controllers/cards/images_controller_test.rb

@@ -0,0 +1,31 @@
+require "test_helper"
+
+class Cards::ImagesControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in_as :kevin
+  end
+
+  test "destroy" do
+    card = cards(:logo)
+    card.image.attach(io: file_fixture("moon.jpg").open, filename: "moon.jpg")
+
+    assert card.image.attached?
+
+    delete card_image_path(card)
+
+    assert_redirected_to card
+    assert_not card.reload.image.attached?
+  end
+
+  test "destroy as JSON" do
+    card = cards(:logo)
+    card.image.attach(io: file_fixture("moon.jpg").open, filename: "moon.jpg")
+
+    assert card.image.attached?
+
+    delete card_image_path(card), as: :json
+
+    assert_response :no_content
+    assert_not card.reload.image.attached?
+  end
+end