Add start of controller testing

test/controllers/info_controller_test.exs

@@ -0,0 +1,16 @@
+defmodule MatrixServerWeb.InfoControllerTest do
+  use MatrixServerWeb.ConnCase
+
+  test "versions endpoint returns a list of supported Matrix spec versions", %{conn: conn} do
+    conn = get(conn, Routes.info_path(conn, :versions))
+
+    assert %{"versions" => versions} = json_response(conn, 200)
+    assert is_list(versions)
+  end
+
+  test "unrecognized route renders M_UNRECOGNIZED error", %{conn: conn} do
+    conn = get(conn, MatrixServerWeb.Endpoint.url() <> "/sneed")
+
+    assert %{"errcode" => "M_UNRECOGNIZED"} = json_response(conn, 400)
+  end
+end