add forgotten files

test/fun_core/basic_signup_allowlist_test.exs

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+defmodule FunCore.BasicSignupAllowlistTest do
+  use ExUnit.Case
+  import FunCore.BasicSignupAllowlist
+
+  test "addresses_as_list" do
+    assert addresses_as_list("joe@example.com, jane@example.com") == [
+             "joe@example.com",
+             "jane@example.com"
+           ]
+  end
+
+  test "jane in list" do
+    lst = addresses_as_list("joe@example.com, jane@example.com")
+    assert "jane@example.com" in lst
+  end
+
+  describe "Not allowlisted when allowed list is" do
+    test "not set" do
+      refute(mail_allowlisted_fun(nil, "joe@example.com"))
+    end
+
+    test "empty" do
+      refute(mail_allowlisted_fun("j", "joe@example.com"))
+    end
+  end
+
+  describe "Allowlisted when" do
+    test "*" do
+      assert(mail_allowlisted_fun("*", "jane@example.com"))
+    end
+
+    test "Multiple set and one match" do
+      assert(mail_allowlisted_fun("joe@example.com, jane@example.com", "jane@example.com"))
+    end
+
+    test "Matches with different casings" do
+      assert(mail_allowlisted_fun("joe@Example.com, jane@example.com", "Joe@example.com"))
+    end
+  end
+end