diff --git a/test/jem-transfer.test.js b/test/jem-transfer.test.js
new file mode 100644
index 0000000..4c5aa13
--- /dev/null
+++ b/test/jem-transfer.test.js
@@ -0,0 +1,99 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const vm = require('node:vm');
+
+function harness() {
+  class Group {
+    constructor(name, parent) { Object.assign(this, { name, origin: [1, 2, 3], rotation: [0, 0, 0], children: [], parent }); parent?.children.push(this); }
+  }
+  const h = { Group, Cube: class {}, Plugin: { register() {} } };
+  const source = fs.readFileSync(path.join(__dirname, '..', 'AnimationDirector.js'), 'utf8').replace('  Plugin.register(PLUGIN_ID, {',
+    '  globalThis.api = { cemTemplateCatalog, jemPresetParts, jemTransferSuggestions, validateJemChoices, jemAdditionBones, addJemEnergyVisibility, refreshJemEnergyFields };\n  Plugin.register(PLUGIN_ID, {');
+  vm.runInNewContext(source, h);
+  return h;
+}
+
+test('JEM preset parent paths include attachment roots and nested groups', () => {
+  const h = harness();
+  const parts = h.api.jemPresetParts({ models: [{ part: 'body', submodels: [{ id: 'fur', submodels: [{ id: 'tip' }] }] }, { part: 'head' }] });
+  assert.deepEqual(Array.from(parts, (part) => [part.name, part.path]), [['body', '0'], ['fur', '0/0'], ['tip', '0/0/0'], ['head', '1']]);
+});
+
+test('suggests added subtrees once, strips actor prefixes and leaves vanilla hierarchy unchanged', () => {
+  const h = harness(), root = new h.Group('actor1_root'), body = new h.Group('actor1_body', root);
+  const d = new h.Group('actor1_d', body), tip = new h.Group('actor1_tip', d);
+  const head = new h.Group('actor1_head', root), extra = new h.Group('actor1_extra', root);
+  const suggestions = h.api.jemTransferSuggestions([root, body, d, tip, head, extra], [{ name: 'body', path: '0' }, { name: 'head', path: '1' }], 1);
+  assert.deepEqual(Array.from(suggestions, (item) => [item.name, item.target]), [['d', '0'], ['extra', '']]);
+  assert.equal(suggestions[0].root, d);
+  assert.equal(tip.parent, d);
+  assert.equal(body.name, 'actor1_body');
+});
+
+test('selected additions require parent mapping; unchecked additions are omitted', () => {
+  const h = harness(), body = new h.Group('actor1_body'), d = new h.Group('actor1_d', body);
+  const suggestions = h.api.jemTransferSuggestions([body, d], [{ name: 'body', path: '0' }], 1);
+  assert.throws(() => h.api.validateJemChoices(suggestions, { include_0: true, parent_0: '' }), /Choose a target parent/);
+  assert.throws(() => h.api.validateJemChoices(suggestions, { include_0: false }), /at least one/);
+  const chosen = h.api.validateJemChoices(suggestions, { include_0: true, parent_0: '0' });
+  assert.equal(chosen[0].tree.name, 'd');
+  assert.equal(chosen[0].target, '0');
+  assert.deepEqual(Array.from(chosen[0].parentOrigin), [1, 2, 3]);
+});
+
+test('CEM catalog integration handles its initial undefined return and dependency errors', async () => {
+  const h = harness();
+  await assert.rejects(h.api.cemTemplateCatalog(), /Install and enable/);
+  let calls = 0;
+  const catalog = { models: { wolf: {} }, entities: [{ id: 'wolf' }] };
+  h.window = { async loadCEMTemplateModels() { return ++calls === 1 ? undefined : catalog; } };
+  assert.equal(await h.api.cemTemplateCatalog(), catalog);
+  assert.equal(calls, 2);
+});
+
+test('energy visibility is opt-in per transferred bone including nested subbones', () => {
+  const h = harness(), body = new h.Group('actor1_body'), d = new h.Group('actor1_d', body);
+  new h.Group('actor1_tip', d);
+  const suggestions = h.api.jemTransferSuggestions([body, d, ...d.children], [{ name: 'body', path: '0' }], 1);
+  assert.deepEqual(Array.from(h.api.jemAdditionBones(suggestions[0]), (bone) => [bone.name, bone.path]), [['d', 'root'], ['tip', 'root_0']]);
+  const selected = h.api.validateJemChoices(suggestions, { include_0: true, parent_0: '0', energy_0_root_0: true });
+  assert.equal(selected[0].tree.energyVisibility, false);
+  assert.equal(selected[0].tree.children[0].group.energyVisibility, true);
+});
+
+test('energy expressions use the final unique bone name and preserve existing preset animations', () => {
+  const h = harness(), root = new h.Group('body'), nested = new h.Group('addition', root);
+  const tip = new h.Group('d3_2', nested);
+  root.cem_animations = [{ 'body.rx': 'existing_expression' }];
+  h.api.addJemEnergyVisibility(tip);
+  assert.equal(root.cem_animations.length, 2);
+  assert.equal(root.cem_animations[0]['body.rx'], 'existing_expression');
+  assert.equal(root.cem_animations[1]['d3_2.visible'], 'nbt(NeedsOfNatureEnergy,range:70-200)');
+  assert.equal(tip.cem_animations, undefined);
+});
+
+test('parent energy visibility disables descendants and omits redundant child expressions without clearing their choices', () => {
+  const h = harness(), body = new h.Group('actor1_body'), d = new h.Group('actor1_d', body);
+  const tip = new h.Group('actor1_tip', d), end = new h.Group('actor1_end', tip);
+  const suggestions = h.api.jemTransferSuggestions([body, d, tip, end], [{ name: 'body', path: '0' }], 1);
+  const fields = Object.fromEntries(['root', 'root_0', 'root_0_0'].map((path) => {
+    const input = {}, bar = { style: {}, querySelectorAll() { return [input]; } };
+    return [`energy_0_${path}`, { bar, input }];
+  }));
+  const dialog = { form: { form_data: fields } };
+  const result = { include_0: true, parent_0: '0', energy_0_root: true, energy_0_root_0: true, energy_0_root_0_0: true };
+  h.api.refreshJemEnergyFields(dialog, suggestions, result);
+  assert.equal(fields.energy_0_root.input.disabled, false);
+  assert.equal(fields.energy_0_root_0.input.disabled, true);
+  assert.equal(fields.energy_0_root_0_0.input.disabled, true);
+  const tree = h.api.validateJemChoices(suggestions, result)[0].tree;
+  assert.equal(tree.energyVisibility, true);
+  assert.equal(tree.children[0].group.energyVisibility, false);
+  result.energy_0_root = false;
+  h.api.refreshJemEnergyFields(dialog, suggestions, result);
+  assert.equal(fields.energy_0_root_0.input.disabled, false);
+  assert.equal(fields.energy_0_root_0_0.input.disabled, true);
+  assert.equal(h.api.validateJemChoices(suggestions, result)[0].tree.children[0].group.energyVisibility, true);
+});