Account namespace updates: part 4 (transfers, singular namespacing) (#896)

* Move Transfer to Account namespace

* Fix partial resolution due to namespacing plurality

* Make category and tag controllers consistent with namespacing convention

* Update stale partial reference

test/controllers/tag/deletions_controller_test.rb

@@ -0,0 +1,36 @@
+require "test_helper"
+
+class Tag::DeletionsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in @user = users(:family_admin)
+    @user_tags = @user.family.tags
+    @tag = tags(:hawaii_trip)
+  end
+
+  test "should get new" do
+    get new_tag_deletion_url(@tag)
+    assert_response :success
+  end
+
+  test "create with replacement" do
+    replacement_tag = tags(:trips)
+
+    affected_transaction_count = @tag.transactions.count
+
+    assert affected_transaction_count > 0
+
+    assert_difference -> { Tag.count } => -1, -> { replacement_tag.transactions.count } => affected_transaction_count do
+      post tag_deletions_url(@tag), params: { replacement_tag_id: replacement_tag.id }
+    end
+  end
+
+  test "create without replacement" do
+    affected_transactions = @tag.transactions
+
+    assert affected_transactions.count > 0
+
+    assert_difference -> { Tag.count } => -1, -> { Tagging.count } => affected_transactions.count * -1 do
+      post tag_deletions_url(@tag)
+    end
+  end
+end