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diff --git a/javascript/test/megolm.spec.js b/javascript/test/megolm.spec.js
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+/*
+Copyright 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+"use strict";
+
+var Olm = require('../olm');
+
+describe("megolm", function() {
+    var aliceSession, bobSession;
+
+    beforeEach(function() {
+        aliceSession = new Olm.OutboundGroupSession();
+        bobSession = new Olm.InboundGroupSession();
+    });
+
+    afterEach(function() {
+        if (aliceSession !== undefined) {
+            aliceSession.free();
+            aliceSession = undefined;
+        }
+
+        if (bobSession !== undefined) {
+            bobSession.free();
+            bobSession = undefined;
+        }
+    });
+
+    it("should encrypt and decrypt", function() {
+        aliceSession.create();
+        expect(aliceSession.message_index()).toEqual(0);
+        bobSession.create(aliceSession.session_key());
+
+        var TEST_TEXT='têst1';
+        var encrypted = aliceSession.encrypt(TEST_TEXT);
+        var decrypted = bobSession.decrypt(encrypted);
+        console.log(TEST_TEXT, "->", decrypted);
+        expect(decrypted.plaintext).toEqual(TEST_TEXT);
+        expect(decrypted.message_index).toEqual(0);
+
+        TEST_TEXT='hot beverage: ☕';
+        encrypted = aliceSession.encrypt(TEST_TEXT);
+        decrypted = bobSession.decrypt(encrypted);
+        console.log(TEST_TEXT, "->", decrypted);
+        expect(decrypted.plaintext).toEqual(TEST_TEXT);
+        expect(decrypted.message_index).toEqual(1);
+
+        // shorter text, to spot buffer overruns
+        TEST_TEXT='☕';
+        encrypted = aliceSession.encrypt(TEST_TEXT);
+        decrypted = bobSession.decrypt(encrypted);
+        console.log(TEST_TEXT, "->", decrypted);
+        expect(decrypted.plaintext).toEqual(TEST_TEXT);
+        expect(decrypted.message_index).toEqual(2);
+    });
+});