Add tests for SimpleFin integration

- Add SimplefinItem model tests with fixtures
- Add SimplefinAccount model tests
- Add SimplefinItemsController tests
- Include test coverage for sync and account creation

test/controllers/simplefin_items_controller_test.rb

@@ -0,0 +1,45 @@
+require "test_helper"
+
+class SimplefinItemsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in users(:dylan)
+    @family = families(:dylan_family)
+    @simplefin_item = SimplefinItem.create!(
+      family: @family,
+      name: "Test Connection",
+      access_url: "https://example.com/test_access"
+    )
+  end
+
+  test "should get index" do
+    get simplefin_items_url
+    assert_response :success
+    assert_includes response.body, @simplefin_item.name
+  end
+
+  test "should get new" do
+    get new_simplefin_item_url
+    assert_response :success
+  end
+
+  test "should show simplefin item" do
+    get simplefin_item_url(@simplefin_item)
+    assert_response :success
+  end
+
+  test "should destroy simplefin item" do
+    assert_difference("SimplefinItem.count", 0) do # doesn't actually delete immediately
+      delete simplefin_item_url(@simplefin_item)
+    end
+
+    assert_redirected_to simplefin_items_path
+    @simplefin_item.reload
+    assert @simplefin_item.scheduled_for_deletion?
+  end
+
+  test "should sync simplefin item" do
+    post sync_simplefin_item_url(@simplefin_item)
+    assert_redirected_to simplefin_item_path(@simplefin_item)
+    assert_equal "Sync started", flash[:notice]
+  end
+end