test: adds tests for header normalization

test/mv/membership/import/header_mapper_test.exs

@@ -0,0 +1,244 @@
+defmodule Mv.Membership.Import.HeaderMapperTest do
+  use ExUnit.Case, async: true
+
+  alias Mv.Membership.Import.HeaderMapper
+
+  describe "normalize_header/1" do
+    test "trims whitespace" do
+      assert HeaderMapper.normalize_header("  email  ") == "email"
+    end
+
+    test "converts to lowercase" do
+      assert HeaderMapper.normalize_header("EMAIL") == "email"
+      assert HeaderMapper.normalize_header("E-Mail") == "e-mail"
+    end
+
+    test "normalizes Unicode characters" do
+      # ß -> ss
+      assert HeaderMapper.normalize_header("Straße") == "strasse"
+      # Umlaute transliteration (ä -> ae, ö -> oe, ü -> ue)
+      assert HeaderMapper.normalize_header("Müller") == "mueller"
+      assert HeaderMapper.normalize_header("Köln") == "koeln"
+      assert HeaderMapper.normalize_header("Grün") == "gruen"
+    end
+
+    test "compresses and removes whitespace" do
+      # Whitespace is removed entirely to ensure "first name" == "firstname"
+      assert HeaderMapper.normalize_header("first  name") == "firstname"
+      assert HeaderMapper.normalize_header("email   address") == "emailaddress"
+    end
+
+    test "unifies hyphen variants" do
+      # Different Unicode hyphen characters should become standard hyphen
+      # en dash
+      assert HeaderMapper.normalize_header("E–Mail") == "e-mail"
+      # minus sign
+      assert HeaderMapper.normalize_header("E−Mail") == "e-mail"
+      # standard hyphen
+      assert HeaderMapper.normalize_header("E-Mail") == "e-mail"
+    end
+
+    test "removes or unifies punctuation" do
+      # Parentheses, slashes, etc. are removed (whitespace is also removed)
+      assert HeaderMapper.normalize_header("E-Mail (privat)") == "e-mailprivat"
+      assert HeaderMapper.normalize_header("Telefon / Mobil") == "telefonmobil"
+    end
+
+    test "handles empty strings" do
+      assert HeaderMapper.normalize_header("") == ""
+      assert HeaderMapper.normalize_header("   ") == ""
+    end
+  end
+
+  describe "build_maps/2" do
+    test "maps English email variant correctly" do
+      headers = ["Email"]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert custom_map == %{}
+      assert unknown == []
+    end
+
+    test "maps German email variant correctly" do
+      headers = ["E-Mail"]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert custom_map == %{}
+      assert unknown == []
+    end
+
+    test "maps multiple member fields" do
+      headers = ["Email", "First Name", "Last Name"]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert member_map[:first_name] == 1
+      assert member_map[:last_name] == 2
+      assert custom_map == %{}
+      assert unknown == []
+    end
+
+    test "handles Unicode and whitespace in headers" do
+      headers = ["  E-Mail  ", "Straße", "  Telefon / Mobil  "]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert member_map[:street] == 1
+      # "Telefon / Mobil" is not a known member field, so it should be unknown
+      assert length(unknown) == 1
+      assert custom_map == %{}
+    end
+
+    test "returns error when duplicate headers normalize to same field" do
+      headers = ["Email", "E-Mail"]
+
+      assert {:error, reason} = HeaderMapper.build_maps(headers, [])
+      assert reason =~ "duplicate"
+      assert reason =~ "email"
+    end
+
+    test "returns error when required field email is missing" do
+      headers = ["First Name", "Last Name"]
+
+      assert {:error, reason} = HeaderMapper.build_maps(headers, [])
+      assert reason =~ "Missing required header"
+      assert reason =~ "email"
+      assert reason =~ "accepted"
+    end
+
+    test "collects unknown columns" do
+      headers = ["Email", "FooBar", "UnknownColumn"]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert length(unknown) == 2
+      assert "FooBar" in unknown or "foobar" in unknown
+      assert "UnknownColumn" in unknown or "unknowncolumn" in unknown
+      assert custom_map == %{}
+    end
+
+    test "ignores empty headers after normalization" do
+      headers = ["Email", "   ", ""]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert custom_map == %{}
+      assert unknown == []
+    end
+
+    test "maps custom field columns correctly" do
+      headers = ["Email", "Lieblingsfarbe"]
+      custom_fields = [%{id: "cf1", name: "Lieblingsfarbe"}]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, custom_fields)
+
+      assert member_map[:email] == 0
+      assert custom_map["cf1"] == 1
+      assert unknown == []
+    end
+
+    test "custom field collision: member field wins" do
+      headers = ["Email"]
+      # Custom field with name "Email" should not override member field
+      custom_fields = [%{id: "cf1", name: "Email"}]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, custom_fields)
+
+      assert member_map[:email] == 0
+      # Custom field should not be in custom_map because member field has priority
+      assert custom_map == %{}
+      assert unknown == []
+    end
+
+    test "handles custom field with Unicode normalization" do
+      headers = ["Email", "Straße"]
+      custom_fields = [%{id: "cf1", name: "Straße"}]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, custom_fields)
+
+      assert member_map[:email] == 0
+      # "Straße" is a member field (street), so it should be in member_map, not custom_map
+      assert member_map[:street] == 1
+      assert custom_map == %{}
+      assert unknown == []
+    end
+
+    test "handles unknown custom field columns" do
+      headers = ["Email", "UnknownCustomField"]
+      custom_fields = [%{id: "cf1", name: "KnownField"}]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, custom_fields)
+
+      assert member_map[:email] == 0
+      assert custom_map == %{}
+      # UnknownCustomField should be in unknown list
+      assert length(unknown) == 1
+    end
+
+    test "handles duplicate custom field names after normalization" do
+      headers = ["Email", "CustomField", "Custom Field"]
+      custom_fields = [%{id: "cf1", name: "CustomField"}]
+
+      # Both "CustomField" and "Custom Field" normalize to the same, so this should error
+      assert {:error, reason} = HeaderMapper.build_maps(headers, custom_fields)
+      assert reason =~ "duplicate"
+    end
+
+    test "maps all supported member fields" do
+      headers = [
+        "Email",
+        "First Name",
+        "Last Name",
+        "Street",
+        "Postal Code",
+        "City"
+      ]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert member_map[:first_name] == 1
+      assert member_map[:last_name] == 2
+      assert member_map[:street] == 3
+      assert member_map[:postal_code] == 4
+      assert member_map[:city] == 5
+      assert custom_map == %{}
+      assert unknown == []
+    end
+
+    test "maps German member field variants" do
+      headers = ["E-Mail", "Vorname", "Nachname", "Straße", "PLZ", "Stadt"]
+
+      assert {:ok, %{member: member_map, custom: custom_map, unknown: unknown}} =
+               HeaderMapper.build_maps(headers, [])
+
+      assert member_map[:email] == 0
+      assert member_map[:first_name] == 1
+      assert member_map[:last_name] == 2
+      assert member_map[:street] == 3
+      assert member_map[:postal_code] == 4
+      assert member_map[:city] == 5
+      assert custom_map == %{}
+      assert unknown == []
+    end
+  end
+end