tmp backgrounds

internal/ui/screen_nav_test.go

@@ -0,0 +1,36 @@
+package ui
+
+import (
+	"testing"
+
+	inkwell "git.teletypegames.org/engines/inkwell"
+
+	"git.teletypegames.org/games/realworld/internal/world"
+)
+
+// The arrow keys walk the deck in registration order and wrap at both ends —
+// until the beats grow doors, that walk is the only way through most screens,
+// so a dead end at either end would strand the player on a greybox screen.
+func TestScreenNavWrapsBothWays(t *testing.T) {
+	g := inkwell.NewGame("t", ScreenW, ScreenH)
+	for _, n := range []string{"a", "b", "c"} {
+		g.SceneManager.Register(inkwell.Scene{Name: n, Background: "bg"})
+	}
+	w := world.New(g)
+	nav := &screenNav{Name: "screen_nav", W: w}
+	at := func(name string) { world.EnterScene(w, name).Start().Tick(&inkwell.Ctx{Game: g}) }
+
+	for _, tc := range []struct {
+		from string
+		step int
+		want string
+	}{
+		{"a", 1, "b"}, {"b", 1, "c"}, {"c", 1, "a"},
+		{"c", -1, "b"}, {"b", -1, "a"}, {"a", -1, "c"},
+	} {
+		at(tc.from)
+		if got := nav.neighbour(g, tc.step); got != tc.want {
+			t.Errorf("from %q step %+d = %q, want %q", tc.from, tc.step, got, tc.want)
+		}
+	}
+}