Add basic router test

Obviously going to be expanded upon by quite a bit, but just wanted to
get started with basic testing sooner rather than later.

mix.exs

@@ -1,4 +1,4 @@
-defmodule RouterExample.MixProject do
+defmodule PrivacyRevolver.MixProject do
   use Mix.Project
 
   def project do

test/privacy_revolver_test.exs

@@ -1,8 +1,18 @@
 defmodule PrivacyRevolverTest do
   use ExUnit.Case
-  doctest PrivacyRevolver
+  use Plug.Test
 
-  test "greets the world" do
-    assert PrivacyRevolver.hello() == :world
+  alias PrivacyRevolver.Router
+
+  @opts Router.init([])
+
+  test "/" do
+    conn =
+      :get
+      |> conn("/", "")
+      |> Router.call(@opts)
+
+    assert conn.state == :sent
+    assert conn.status == 200
   end
 end