diff --git a/src/client.gleam b/src/client.gleam
index c564154..c5e8489 100644
--- a/src/client.gleam
+++ b/src/client.gleam
@@ -37,14 +37,14 @@ pub fn main() -> Nil {
   let assert Ok(uri) = modem.initial_uri()
 
   let app = lustre.application(init:, update:, view:)
-  let assert Ok(_runtime) = lustre.start(app, "#app", InitOpts(uri))
+  let assert Ok(_runtime) = lustre.start(app, "#app", Init(uri))
 
   Nil
 }
 
 /// Data passed to our application during startup
-pub type InitOpts {
-  InitOpts(
+pub type Init {
+  Init(
     /// Uri of the page when it first loaded.
     uri: uri.Uri,
   )
@@ -75,7 +75,7 @@ pub type Msg {
 // INIT ------------------------------------------------------------------------
 
 /// Build initial application Model
-pub fn init(opts: InitOpts) -> #(Model, Effect(Msg)) {
+pub fn init(opts: Init) -> #(Model, Effect(Msg)) {
   let route = route.parse(opts.uri)
   let page = page.init(route)
   let is_protected = route.is_protected(route)
diff --git a/test/client_test/dummy.gleam b/test/client_test/dummy.gleam
index 291dfba..be66fa0 100644
--- a/test/client_test/dummy.gleam
+++ b/test/client_test/dummy.gleam
@@ -9,7 +9,7 @@ import client/user/role
 import gleam/json
 
 pub fn user(role: role.Role) -> User {
-  User(id: "", role:, full_name: "Dummy", email: "dummy@lustre.dev")
+  User(id: "000", role:, full_name: "Dummy", email: "dummy@lustre.dev")
 }
 
 ///   Authenticated session used for testing purposes.
diff --git a/test/client_test/page_test/login_test.gleam b/test/client_test/page_test/login_test.gleam
index 41a7ebe..1d7032c 100644
--- a/test/client_test/page_test/login_test.gleam
+++ b/test/client_test/page_test/login_test.gleam
@@ -1,16 +1,49 @@
-import client/language
+import client
+import client/language as lang
 import client/page/login
 import client/session
+import client/session/token
 import client/user/role
 import client_test/dummy
 import gleam/list
+import gleam/uri
 import lustre/dev/query
+import lustre/dev/simulate
 import lustre/effect
 import rsvp
 
+fn app() -> simulate.App(client.Init, client.Model, client.Msg) {
+  simulate.application(client.init, client.update, client.view)
+}
+
+fn init() -> client.Init {
+  uri.Uri(..uri.empty, path: "/login") |> client.Init
+}
+
+pub fn authentication_test() -> Nil {
+  let session =
+    role.Default
+    |> dummy.session
+
+  let msg =
+    Ok(session)
+    |> login.ApiReturnedSession
+    |> client.LoginMsg
+
+  let sim =
+    simulate.start(app(), init())
+    |> simulate.message(msg)
+
+  let model = simulate.model(sim)
+  let assert session.Authenticated(token) = model.session as "authenticated"
+  assert token.user(token).role == role.Default as "default role"
+
+  Nil
+}
+
 pub fn disable_button_test() -> Nil {
   let model = login.init
-  let html = login.view(model, language.English)
+  let html = login.view(model, lang.English)
 
   let button = query.id("submit")
   let disabled = query.attribute("disabled", "")
@@ -42,7 +75,7 @@ pub fn submit_test() -> Nil {
   assert model.password == password
   assert model.loading == True
 
-  let html = login.view(model, language.English)
+  let html = login.view(model, lang.English)
   let button = query.id("submit")
   let busy = query.aria("busy", "true")
   assert query.has(in: html, matching: query.and(button, busy))
@@ -50,7 +83,7 @@ pub fn submit_test() -> Nil {
   Nil
 }
 
-pub fn auth_success_test() -> Nil {
+pub fn success_step_test() -> Nil {
   let want = dummy.token(role.Default)
 
   let login_step =
@@ -65,7 +98,7 @@ pub fn auth_success_test() -> Nil {
   Nil
 }
 
-pub fn auth_failure_test() -> Nil {
+pub fn failure_step_test() -> Nil {
   let want = rsvp.NetworkError
 
   let login_step =