Takt und Bewegung der Figur

TickClock rechnet Bildzeit in Takte um und holt nach einem Ruckler
höchstens fünf Takte auf. GridMotion bewegt einen Körper über das
Kachelraster und lässt ihn an Wänden entlanggleiten. Die Figur läuft
fünf Felder pro Sekunde, außerhalb des Gleichschritts.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

game/tests/test_tick_clock.gd

@@ -0,0 +1,31 @@
+extends TestCase
+
+
+func test_one_tick_lasts_a_twentieth_of_a_second() -> void:
+	var clock := TickClock.new(20)
+	check_eq(clock.advance(0.05), 1, "a full tick")
+	check_eq(clock.advance(0.025), 0, "half a tick")
+	check_eq(clock.advance(0.025), 1, "the second half completes the tick")
+
+
+func test_a_second_of_short_frames_runs_about_twenty_ticks() -> void:
+	var clock := TickClock.new(20)
+	var ticks := 0
+	for frame in 60:
+		ticks += clock.advance(1.0 / 60.0)
+	# Rounding in floating point may leave the last tick for the next frame.
+	check(ticks == 19 or ticks == 20, "19 or 20 ticks, got %d" % ticks)
+
+
+func test_a_long_stall_runs_at_most_five_ticks_and_forgets_the_rest() -> void:
+	var clock := TickClock.new(20)
+	check_eq(clock.advance(10.0), TickClock.MAX_TICKS_PER_FRAME, "capped")
+	check_eq(clock.advance(0.0), 0, "the rest of the stall is dropped")
+
+
+func test_a_paused_clock_runs_no_ticks() -> void:
+	var clock := TickClock.new(20)
+	clock.paused = true
+	check_eq(clock.advance(1.0), 0, "paused")
+	clock.paused = false
+	check_eq(clock.advance(0.05), 1, "running again")