Add JSON support for pin/unpin on the card endpoints and add tests.

test/controllers/cards/pins_controller_test.rb

@@ -17,6 +17,17 @@ class Cards::PinsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
   end
 
+  test "create as JSON" do
+    card = cards(:layout)
+
+    assert_not card.pinned_by?(users(:kevin))
+
+    post card_pin_path(card), as: :json
+
+    assert_response :no_content
+    assert card.reload.pinned_by?(users(:kevin))
+  end
+
   test "destroy" do
     assert_changes -> { cards(:shipping).pinned_by?(users(:kevin)) }, from: true, to: false do
       perform_enqueued_jobs do
@@ -28,4 +39,15 @@ class Cards::PinsControllerTest < ActionDispatch::IntegrationTest
 
     assert_response :success
   end
+
+  test "destroy as JSON" do
+    card = cards(:shipping)
+
+    assert card.pinned_by?(users(:kevin))
+
+    delete card_pin_path(card), as: :json
+
+    assert_response :no_content
+    assert_not card.reload.pinned_by?(users(:kevin))
+  end
 end