Fix shuffle hotkey reshuffle behavior (q1)

1 files changed, 54 insertions, 0 deletions

diff --git a/web/js/tests/shuffle.test.js b/web/js/tests/shuffle.test.js
new file mode 100644
index 0000000..bfbc79a
--- /dev/null
+++ b/web/js/tests/shuffle.test.js
@@ -0,0 +1,54 @@
+import { enable, isOn, revision, toggle } from '../shuffle.js';
+
+const failures = [];
+const button = {
+  active: false,
+  classList: {
+    toggle(name, enabled) {
+      if (name === 'active') button.active = enabled;
+    },
+  },
+};
+
+globalThis.document = {
+  getElementById(id) {
+    return id === 'shuffle-toggle' ? button : null;
+  },
+};
+
+function assert(cond, msg) {
+  if (!cond) failures.push(msg || 'assertion failed');
+}
+
+function testEnableTurnsShuffleOn() {
+  enable();
+  assert(isOn(), 'enable should turn shuffle on');
+  assert(button.active, 'enable should update the shuffle button active state');
+}
+
+function testRepeatedEnableKeepsShuffleOnAndAdvancesRevision() {
+  const before = revision();
+  enable();
+  assert(isOn(), 'repeated enable should keep shuffle on');
+  assert(revision() > before, 'repeated enable should advance revision for a fresh random load');
+}
+
+function testToggleCanStillTurnShuffleOff() {
+  toggle();
+  assert(!isOn(), 'toggle should still turn shuffle off for the toolbar button');
+  assert(!button.active, 'toggle should update the shuffle button inactive state');
+}
+
+console.log('Running shuffle tests...');
+testEnableTurnsShuffleOn();
+testRepeatedEnableKeepsShuffleOnAndAdvancesRevision();
+testToggleCanStillTurnShuffleOff();
+
+if (failures.length) {
+  console.error('FAILURES:');
+  failures.forEach((m) => console.error('  - ' + m));
+  process.exit(1);
+} else {
+  console.log('All shuffle tests passed.');
+  process.exit(0);
+}