Handle coordinate precision the same as Scratch 2 (#1722)

test/unit/blocks_motion.js

@@ -0,0 +1,26 @@
+const test = require('tap').test;
+const Motion = require('../../src/blocks/scratch3_motion');
+const Runtime = require('../../src/engine/runtime');
+const Sprite = require('../../src/sprites/sprite.js');
+const RenderedTarget = require('../../src/sprites/rendered-target.js');
+
+test('getPrimitives', t => {
+    const rt = new Runtime();
+    const motion = new Motion(rt);
+    t.type(motion.getPrimitives(), 'object');
+    t.end();
+});
+
+test('Coordinates have limited precision', t => {
+    const rt = new Runtime();
+    const motion = new Motion(rt);
+    const sprite = new Sprite(null, rt);
+    const target = new RenderedTarget(sprite, rt);
+    const util = {target};
+
+    motion.goToXY({X: 0.999999999, Y: 0.999999999}, util);
+
+    t.equals(motion.getX({}, util), 1);
+    t.equals(motion.getY({}, util), 1);
+    t.end();
+});