test: fee type column visibility, CSV export, export controller

FieldVisibility pseudo fields and visible selection; MembersCSV fee type
column; export accepts membership_fee_type and returns Fee Type column.

test/mv_web/live/member_live/index/field_visibility_test.exs

@@ -56,6 +56,14 @@ defmodule MvWeb.MemberLive.Index.FieldVisibilityTest do
         assert field in result
       end)
     end
+
+    test "includes pseudo member fields (membership_fee_status, membership_fee_type, groups)" do
+      result = FieldVisibility.get_all_available_fields([])
+
+      assert :membership_fee_status in result
+      assert :membership_fee_type in result
+      assert :groups in result
+    end
   end
 
   describe "merge_with_global_settings/3" do
@@ -278,6 +286,20 @@ defmodule MvWeb.MemberLive.Index.FieldVisibilityTest do
     test "handles invalid input" do
       assert FieldVisibility.get_visible_member_fields(nil) == []
     end
+
+    test "returns membership_fee_type when visible in selection" do
+      selection = %{
+        "first_name" => true,
+        "membership_fee_type" => true,
+        "groups" => false
+      }
+
+      result = FieldVisibility.get_visible_member_fields(selection)
+
+      assert :membership_fee_type in result
+      assert :first_name in result
+      refute :groups in result
+    end
   end
 
   describe "get_visible_custom_fields/1" do