Add node tests

test/node/ol/asserts.test.js

@@ -0,0 +1,12 @@
+import expect from '../expect.js';
+import {assert} from '../../../src/ol/asserts.js';
+
+describe('ol/asserts.js', function () {
+  describe('assert', function () {
+    it('throws an exception', function () {
+      expect(function () {
+        assert(false, 42);
+      }).to.throwException();
+    });
+  });
+});