diff --git a/developer/js/package.json b/developer/js/package.json
index c6349af705..21bc00aa8d 100644
--- a/developer/js/package.json
+++ b/developer/js/package.json
@@ -6,7 +6,7 @@
   "types": "dist/index.d.ts",
   "scripts": {
     "build": "npx tsc -p .",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "mocha -r ts-node/register tests/**/test-*.ts"
   },
   "author": "Marc Durdin (SIL)",
   "license": "MIT",
diff --git a/developer/js/tests/test-hello-world.ts b/developer/js/tests/test-hello-world.ts
index c9b6154ea5..4c1a37c39c 100644
--- a/developer/js/tests/test-hello-world.ts
+++ b/developer/js/tests/test-hello-world.ts
@@ -1,11 +1,11 @@
 import LexicalModelCompiler from '../';
-import {expect} from 'chai';
+import {assert} from 'chai';
 import 'mocha';
 
 describe('LexicalModelCompiler', function () {
   describe('#hello()', function () {
     it('should say "hello"', function () {
-      expect((new LexicalModelCompiler).hello()).to.be('Hello, world!');
+      assert.strictEqual((new LexicalModelCompiler).hello(), 'Hello, world!');
     });
   });
 });