diff --git a/test/nulla_web/controllers/webfinger_controller_test.exs b/test/nulla_web/controllers/webfinger_controller_test.exs
new file mode 100644
index 0000000..041ec5a
--- /dev/null
+++ b/test/nulla_web/controllers/webfinger_controller_test.exs
@@ -0,0 +1,82 @@
+defmodule NullaWeb.WebfingerControllerTest do
+  use NullaWeb.ConnCase
+  alias Nulla.Models.Actor
+
+  setup do
+    Actor.create_actor(%{
+      domain: "localhost",
+      ap_id: "http://localhost/users/test",
+      type: "Person",
+      following: "http://localhost/users/test/following",
+      followers: "http://localhost/users/test/followers",
+      inbox: "http://localhost/users/test/inbox",
+      outbox: "http://localhost/users/test/outbox",
+      featured: "http://localhost/users/test/collections/featured",
+      featuredTags: "http://localhost/users/test/collections/tags",
+      preferredUsername: "test",
+      name: "Test",
+      summary: "Test User",
+      url: "http://localhost/@test",
+      manuallyApprovesFollowers: false,
+      discoverable: true,
+      indexable: true,
+      published: DateTime.utc_now(),
+      memorial: false,
+      publicKey:
+        Jason.OrderedObject.new(
+          id: "http://localhost/users/test#main-key",
+          owner: "http://localhost/users/test",
+          publicKeyPem: "PUBLIC KEY"
+        ),
+      endpoints: Jason.OrderedObject.new(sharedInbox: "http://localhost/inbox")
+    })
+
+    :ok
+  end
+
+  describe "GET /.well-known/webfinger" do
+    test "returns 400 without parameters", %{conn: conn} do
+      conn =
+        conn
+        |> get(~p"/.well-known/webfinger")
+
+      assert conn.status == 400
+    end
+
+    test "returns 400 without :acct", %{conn: conn} do
+      conn =
+        conn
+        |> get(~p"/.well-known/webfinger?resource=test@localhost")
+
+      assert conn.status == 400
+    end
+
+    test "returns 400 without domain", %{conn: conn} do
+      conn =
+        conn
+        |> get(~p"/.well-known/webfinger?resource=acct:test")
+
+      assert conn.status == 400
+    end
+
+    test "returns 404 with invalid domain", %{conn: conn} do
+      conn =
+        conn
+        |> get(~p"/.well-known/webfinger?resource=acct:test@example")
+
+      assert conn.status == 404
+    end
+
+    test "returns Webfinger", %{conn: conn} do
+      conn =
+        conn
+        |> get(~p"/.well-known/webfinger?resource=acct:test@localhost")
+
+      assert response = json_response(conn, 200)
+
+      assert is_binary(response["subject"])
+      assert is_list(response["aliases"])
+      assert is_list(response["links"])
+    end
+  end
+end