diff --git a/packages/tonal/vitest/tonal.test.mjs b/packages/tonal/vitest/tonal.test.mjs
new file mode 100644
index 00000000..5c039477
--- /dev/null
+++ b/packages/tonal/vitest/tonal.test.mjs
@@ -0,0 +1,17 @@
+/*
+tonal.test.mjs - <short description TODO>
+Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/tonal/test/tonal.test.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+// import { strict as assert } from 'assert';
+
+import '../tonal.mjs'; // need to import this to add prototypes
+import { pure } from '@strudel.cycles/core';
+import { describe, it, expect } from 'vitest';
+
+describe('tonal', () => {
+  it('Should run tonal functions ', () => {
+    expect(pure('c3').scale('C major').scaleTranspose(1)._firstCycleValues).toEqual(['D3']);
+  });
+});
diff --git a/packages/tone/vitest/tone.test.mjs b/packages/tone/vitest/tone.test.mjs
new file mode 100644
index 00000000..aced9e9a
--- /dev/null
+++ b/packages/tone/vitest/tone.test.mjs
@@ -0,0 +1,18 @@
+/*
+tone.test.mjs - <short description TODO>
+Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/tone/test/tone.test.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import '../tone.mjs';
+import { pure } from '@strudel.cycles/core';
+import { describe, it, expect } from 'vitest';
+
+describe('tone', () => {
+  it('Should have working tone function', () => {
+    // const s = synth().chain(out()); // TODO: mock audio context?
+    // assert.deepStrictEqual(s, new Tone.Synth().chain(out()));
+    const s = {};
+    expect(pure('c3').tone(s)._firstCycleValues).toEqual(['c3']);
+  });
+});
diff --git a/packages/xen/vitest/xen.test.mjs b/packages/xen/vitest/xen.test.mjs
new file mode 100644
index 00000000..977b0f69
--- /dev/null
+++ b/packages/xen/vitest/xen.test.mjs
@@ -0,0 +1,14 @@
+/*
+xen.test.mjs - <short description TODO>
+Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/xen/test/xen.test.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { edo } from '../xen.mjs';
+import { describe, it, expect } from 'vitest';
+
+describe('xen', () => {
+  it('edo', () => {
+    expect(edo('3edo')).toEqual([1, Math.pow(2, 1 / 3), Math.pow(2, 2 / 3)]);
+  });
+});