Add regression test for event particulars defaults

Author: robzolkos

test/models/event_test.rb

@@ -17,4 +17,37 @@ class EventTest < ActiveSupport::TestCase
       relation.for_creators([]).for_boards([]).load
     end
   end
+
+  test "api_particulars returns empty strings for missing nested board change values" do
+    event = boards(:writebook).events.create!(
+      action: "card_board_changed",
+      creator: users(:david),
+      eventable: cards(:logo),
+      account: accounts("37s"),
+      particulars: {}
+    )
+
+    assert_equal({ "old_board" => "", "new_board" => "" }, event.api_particulars)
+  end
+
+  test "api_particulars returns empty strings for missing nested title and column values" do
+    title_event = boards(:writebook).events.create!(
+      action: "card_title_changed",
+      creator: users(:david),
+      eventable: cards(:logo),
+      account: accounts("37s"),
+      particulars: {}
+    )
+
+    triage_event = boards(:writebook).events.create!(
+      action: "card_triaged",
+      creator: users(:david),
+      eventable: cards(:logo),
+      account: accounts("37s"),
+      particulars: {}
+    )
+
+    assert_equal({ "old_title" => "", "new_title" => "" }, title_event.api_particulars)
+    assert_equal({ "column" => "" }, triage_event.api_particulars)
+  end
 end