diff --git a/reproxy b/reproxy
index c03be07..e9a6814 160000
--- a/reproxy
+++ b/reproxy
@@ -1 +1 @@
-Subproject commit c03be07eab78a88491b832fbe94f01f920656c3b
+Subproject commit e9a6814ebb9767a974cb34ea9545703f180c0d99
diff --git a/tests/reproxy/motion.test.cjs b/tests/reproxy/motion.test.cjs
new file mode 100644
index 0000000..a6ed7f7
--- /dev/null
+++ b/tests/reproxy/motion.test.cjs
@@ -0,0 +1,37 @@
+const assert = require('node:assert/strict');
+const { readFileSync } = require('node:fs');
+const { resolve } = require('node:path');
+const { test } = require('node:test');
+const { runInNewContext } = require('node:vm');
+const source = readFileSync(resolve(__dirname, '../../reproxy/web/minecraft/motion.js'), 'utf8');
+
+for (const reduced of [false, true]) {
+    test(`motion controls, reduced motion=${reduced}`, () => {
+        const classes = new Set();
+        const attributes = {};
+        let click;
+        let preferenceChanged;
+        const button = { hidden: true, setAttribute: (key, value) => attributes[key] = value, addEventListener: (name, callback) => { assert.equal(name, 'click'); click = callback; } };
+        runInNewContext(source, {
+            document: { getElementById: () => button, documentElement: { classList: {
+                toggle: (key, value) => value ? classes.add(key) : classes.delete(key),
+                contains: key => classes.has(key),
+            } } },
+            window: { matchMedia: query => {
+                assert.equal(query, '(prefers-reduced-motion: reduce)');
+                return { matches: reduced, addEventListener: (name, callback) => { assert.equal(name, 'change'); preferenceChanged = callback; } };
+            } },
+        });
+        assert.equal(button.hidden, false);
+        assert.equal(classes.has('motion-running'), !reduced);
+        assert.equal(attributes['aria-pressed'], String(reduced));
+        click();
+        assert.equal(classes.has('motion-running'), reduced);
+        assert.equal(button.textContent, reduced ? 'Остановить механизмы' : 'Запустить механизмы');
+        click();
+        assert.equal(classes.has('motion-running'), !reduced);
+        preferenceChanged({ matches: true });
+        assert.equal(classes.has('motion-running'), false);
+        assert.equal(attributes['aria-pressed'], 'true');
+    });
+}