feat: add twitch tv login flow and auth state ui

internal/tui/model_test.go

@@ -1,9 +1,16 @@
 package tui
 
-import "testing"
+import (
+	"testing"
+
+	"parasocial/internal/auth"
+)
 
 func TestViewDisplaysStreamers(t *testing.T) {
-	model := New([]string{"alpha", "beta"})
+	model := New(Options{
+		Streamers: []string{"alpha", "beta"},
+	})
+	model.mode = streamerView
 
 	got := model.View()
 	want := "Streamers\n1. alpha\n2. beta\n\n"
@@ -11,3 +18,35 @@ func TestViewDisplaysStreamers(t *testing.T) {
 		t.Fatalf("View() = %q, want %q", got, want)
 	}
 }
+
+func TestAuthUpdateAppendsLogLine(t *testing.T) {
+	model := New(Options{Streamers: []string{"alpha"}})
+
+	updated, cmd := model.Update(AuthUpdate{Line: "Open page: https://www.twitch.tv/activate"})
+	if cmd != nil {
+		t.Fatal("expected nil cmd after auth update without channel")
+	}
+
+	next := updated.(Model)
+	got := next.View()
+	want := "Twitch Login\nOpen page: https://www.twitch.tv/activate\n\n"
+	if got != want {
+		t.Fatalf("View() = %q, want %q", got, want)
+	}
+}
+
+func TestAuthSuccessSwitchesToStreamerView(t *testing.T) {
+	model := New(Options{Streamers: []string{"alpha"}})
+
+	updated, _ := model.Update(AuthUpdate{
+		State: &auth.State{Login: "viewer"},
+		Done:  true,
+	})
+
+	next := updated.(Model)
+	got := next.View()
+	want := "Logged in as viewer\n\nStreamers\n1. alpha\n\n"
+	if got != want {
+		t.Fatalf("View() = %q, want %q", got, want)
+	}
+}