From 127cbb778ceba7d90848b6d2b7cf63e86a232e05 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philippe=20Rivi=C3=A8re?= <fil@rezo.net>
Date: Sat, 15 Aug 2020 13:30:10 +0200
Subject: [PATCH] test that forceCollide jiggles in a reproducible way

---
 test/collide-test.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/test/collide-test.js b/test/collide-test.js
index f9ed20f..e9529d6 100644
--- a/test/collide-test.js
+++ b/test/collide-test.js
@@ -46,3 +46,12 @@ tape("forceCollide jiggles equal positions", function(test) {
   test.equal(a.vy, -b.vy);
   test.end();
 });
+
+tape("forceCollide jiggles in a reproducible way", function(test) {
+  const nodes = Array.from({length:10}, () => ({x:0,y:0}));
+  force.forceSimulation()
+    .nodes(nodes)
+    .force("collide", force.forceCollide()).stop().tick(50);
+  test.nodeEqual(nodes[0], {x: -5.371433857229194, y: -2.6644608278592576, index: 0, vy: 0, vx: 0});
+  test.end();
+});