get tests working

test/pattern.test.mjs

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+
+import 'fraction.js';
+
+import { strict as assert } from 'assert';
+
+import {TimeSpan, Hap} from "../js/strudel.mjs";
+
+describe('TimeSpan', function() {
+  describe('equal()', function() {
+    it('Should be equal to the same value', function() {
+      assert.equal((new TimeSpan(0,4)).equals(new TimeSpan(0,4)), true);
+    });
+  });
+});
+
+describe('Hap', function() {
+    describe('has_onset()', function() {
+      it('True if part includes onset from whole', function() {
+        assert.equal(new Hap(new TimeSpan(0,1), new TimeSpan(0,1), "thing").has_onset(), true);
+      });
+    });
+  });
+