chore: movs display name helper to won helper module

test/mv_web/helpers/member_helpers_test.exs

@@ -0,0 +1,141 @@
+defmodule MvWeb.Helpers.MemberHelpersTest do
+  @moduledoc """
+  Tests for the display_name/1 helper function in MemberHelpers.
+  """
+  use Mv.DataCase, async: true
+
+  alias Mv.Membership.Member
+  alias MvWeb.Helpers.MemberHelpers
+
+  describe "display_name/1" do
+    test "returns full name when both first_name and last_name are present" do
+      member = %Member{
+        first_name: "John",
+        last_name: "Doe",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "John Doe"
+    end
+
+    test "returns email when both first_name and last_name are nil" do
+      member = %Member{
+        first_name: nil,
+        last_name: nil,
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "john@example.com"
+    end
+
+    test "returns first_name only when last_name is nil" do
+      member = %Member{
+        first_name: "John",
+        last_name: nil,
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "John"
+    end
+
+    test "returns last_name only when first_name is nil" do
+      member = %Member{
+        first_name: nil,
+        last_name: "Doe",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "Doe"
+    end
+
+    test "returns email when first_name and last_name are empty strings" do
+      member = %Member{
+        first_name: "",
+        last_name: "",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "john@example.com"
+    end
+
+    test "returns email when first_name and last_name are whitespace only" do
+      member = %Member{
+        first_name: "   ",
+        last_name: "  \t  ",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "john@example.com"
+    end
+
+    test "trims whitespace from name parts" do
+      member = %Member{
+        first_name: "  John  ",
+        last_name: "  Doe  ",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "John Doe"
+    end
+
+    test "handles one empty string and one nil" do
+      member = %Member{
+        first_name: "",
+        last_name: nil,
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "john@example.com"
+    end
+
+    test "handles one nil and one empty string" do
+      member = %Member{
+        first_name: nil,
+        last_name: "",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "john@example.com"
+    end
+
+    test "handles one whitespace and one nil" do
+      member = %Member{
+        first_name: "   ",
+        last_name: nil,
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "john@example.com"
+    end
+
+    test "handles one valid name and one whitespace" do
+      member = %Member{
+        first_name: "John",
+        last_name: "   ",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "John"
+    end
+
+    test "handles member with only first_name containing whitespace" do
+      member = %Member{
+        first_name: "  John  ",
+        last_name: nil,
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "John"
+    end
+
+    test "handles member with only last_name containing whitespace" do
+      member = %Member{
+        first_name: nil,
+        last_name: "  Doe  ",
+        email: "john@example.com"
+      }
+
+      assert MemberHelpers.display_name(member) == "Doe"
+    end
+  end
+end