Add node tests

test/node/ol/util.test.js

@@ -0,0 +1,25 @@
+import expect from '../expect.js';
+import {getUid} from '../../../src/ol/util.js';
+
+describe('ol/util.js', () => {
+  describe('getUid()', function () {
+    it('is constant once generated', function () {
+      const a = {};
+      expect(getUid(a)).to.be(getUid(a));
+    });
+
+    it('generates a strictly increasing sequence', function () {
+      const a = {};
+      const b = {};
+      const c = {};
+      getUid(a);
+      getUid(c);
+      getUid(b);
+
+      // uid order should be a < c < b
+      expect(getUid(a)).to.be.lessThan(getUid(c));
+      expect(getUid(c)).to.be.lessThan(getUid(b));
+      expect(getUid(a)).to.be.lessThan(getUid(b));
+    });
+  });
+});