test: remove random factor in simulation tests

It would otherwise be possible to make the execution order non-determininistic.

lib/animation/Animation.js

@@ -62,11 +62,13 @@ const EASE_IN_OUT = function(pos) {
 const TOKEN_SIZE = 20;
 
 
-export default function Animation(canvas, eventBus, scopeFilter) {
+export default function Animation(config, canvas, eventBus, scopeFilter) {
   this._eventBus = eventBus;
   this._scopeFilter = scopeFilter;
   this._canvas = canvas;
 
+  this._randomize = config && config.randomize !== false;
+
   this._animations = new Set();
   this._speed = 1;
 
@@ -127,7 +129,7 @@ Animation.prototype.createAnimation = function(connection, scope, done = noop) {
 
   const tokenGfx = this._createTokenGfx(group, scope);
 
-  const animation = new TokenAnimation(tokenGfx, connection.waypoints, () => {
+  const animation = new TokenAnimation(tokenGfx, connection.waypoints, this._randomize, () => {
     this._animations.delete(animation);
 
     done();
@@ -237,16 +239,18 @@ Animation.prototype._getGroup = function(scope) {
 };
 
 Animation.$inject = [
+  'config.animation',
   'canvas',
   'eventBus',
   'scopeFilter'
 ];
 
 
-function TokenAnimation(gfx, waypoints, done) {
+function TokenAnimation(gfx, waypoints, randomize, done) {
   this.gfx = gfx;
   this.waypoints = waypoints;
   this.done = done;
+  this.randomize = randomize;
 
   this._paused = true;
   this._t = 0;
@@ -362,7 +366,7 @@ TokenAnimation.prototype.create = function() {
     return d;
   }, []).flat().join(' ');
 
-  const totalDuration = getAnimationDuration(totalLength);
+  const totalDuration = getAnimationDuration(totalLength, this._randomize);
 
   this._parts = parts.reduce((parts, part, index) => {
     const duration = totalDuration / totalLength * part.length;
@@ -404,8 +408,8 @@ TokenAnimation.prototype.setSpeed = function(speed) {
   this._speed = speed;
 };
 
-function getAnimationDuration(length) {
-  return Math.log(length) * randomBetween(250, 300);
+function getAnimationDuration(length, randomize = false) {
+  return Math.log(length) * (randomize ? randomBetween(250, 300) : 250);
 }
 
 function randomBetween(min, max) {

test/spec/SimulationSpec.js

@@ -3,7 +3,7 @@ import ModelerModule from 'lib/modeler';
 import SimulationSupportModule from 'lib/simulation-support';
 
 import {
-  bootstrapModeler,
+  bootstrapModeler as _bootstrapModeler,
   inject,
   getBpmnJS,
   withBpmnJs
@@ -21,6 +21,20 @@ const TestModule = {
   ]
 };
 
+function bootstrapModeler(diagram, config) {
+  const {
+    animation = {},
+    ...restConfig
+  } = config;
+
+  return _bootstrapModeler(diagram, {
+    ...restConfig,
+    animation: {
+      randomize: false,
+      ...animation
+    }
+  });
+}
 
 describe('simulation', function() {