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diff --git a/test/pleroma/registration_test.exs b/test/pleroma/registration_test.exs
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+++ b/test/pleroma/registration_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.RegistrationTest do
+  use Pleroma.DataCase
+
+  import Pleroma.Factory
+
+  alias Pleroma.Registration
+  alias Pleroma.Repo
+
+  describe "generic changeset" do
+    test "requires :provider, :uid" do
+      registration = build(:registration, provider: nil, uid: nil)
+
+      cs = Registration.changeset(registration, %{})
+      refute cs.valid?
+
+      assert [
+               provider: {"can't be blank", [validation: :required]},
+               uid: {"can't be blank", [validation: :required]}
+             ] == cs.errors
+    end
+
+    test "ensures uniqueness of [:provider, :uid]" do
+      registration = insert(:registration)
+      registration2 = build(:registration, provider: registration.provider, uid: registration.uid)
+
+      cs = Registration.changeset(registration2, %{})
+      assert cs.valid?
+
+      assert {:error,
+              %Ecto.Changeset{
+                errors: [
+                  uid:
+                    {"has already been taken",
+                     [constraint: :unique, constraint_name: "registrations_provider_uid_index"]}
+                ]
+              }} = Repo.insert(cs)
+
+      # Note: multiple :uid values per [:user_id, :provider] are intentionally allowed
+      cs2 = Registration.changeset(registration2, %{uid: "available.uid"})
+      assert cs2.valid?
+      assert {:ok, _} = Repo.insert(cs2)
+
+      cs3 = Registration.changeset(registration2, %{provider: "provider2"})
+      assert cs3.valid?
+      assert {:ok, _} = Repo.insert(cs3)
+    end
+
+    test "allows `nil` :user_id (user-unbound registration)" do
+      registration = build(:registration, user_id: nil)
+      cs = Registration.changeset(registration, %{})
+      assert cs.valid?
+      assert {:ok, _} = Repo.insert(cs)
+    end
+  end
+end