time for a snapshot

workshop/steps/08-resolve/resolve.test.ts

@@ -0,0 +1,19 @@
+import { expect, test } from "bun:test";
+import { vec } from "./given.ts";
+import { resolve } from "./resolve.ts";
+
+test("no collision -> full move", () => {
+	expect(resolve(vec(0, 0), vec(10, 5), null)).toEqual({ x: 10, y: 5 });
+});
+
+test("collision at t=0.3 -> stop at contact", () => {
+	const hit = { time: 0.3, normal: vec(-1, 0) };
+	const p = resolve(vec(0, 0), vec(10, 0), hit);
+	expect(p.x).toBeCloseTo(3);
+	expect(p.y).toBeCloseTo(0);
+});
+
+test("collision at t=0 -> don't move at all", () => {
+	const hit = { time: 0, normal: vec(-1, 0) };
+	expect(resolve(vec(5, 5), vec(10, 10), hit)).toEqual({ x: 5, y: 5 });
+});