diff --git a/lib/js/test/test-int64.js b/lib/js/test/test-int64.js
new file mode 100644
index 0000000..4df87e1
--- /dev/null
+++ b/lib/js/test/test-int64.js
@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+ /* jshint -W100 */
+
+// Work around for old API used by QUnitAdapter of jsTestDriver
+if (typeof QUnit.log == 'function') {
+  // When using real QUnit (fron PhantomJS) log failures to console
+  QUnit.log(function(details) {
+    if (!details.result) {
+      console.log('======== FAIL ========');
+      console.log('TestName: ' + details.name);
+      if (details.message) console.log(details.message);
+      console.log('Expected: ' + details.expected);
+      console.log('Actual  : ' + details.actual);
+      console.log('======================');
+    }
+  });
+}
+
+QUnit.module('Int64');
+
+  QUnit.test('Int64', function(assert) {
+    console.log('Int64 test -- starts');
+    const EXPECTED_SMALL_INT64_AS_NUMBER = 42;
+    const EXPECTED_SMALL_INT64 = new Int64(42);
+    const EXPECTED_MAX_JS_SAFE_INT64 = new Int64(Number.MAX_SAFE_INTEGER);
+    const EXPECTED_MIN_JS_SAFE_INT64 = new Int64(Number.MIN_SAFE_INTEGER);
+    const EXPECTED_MAX_JS_SAFE_PLUS_ONE_INT64 = new Int64("0020000000000000"); // hex-encoded
+    const EXPECTED_MIN_JS_SAFE_MINUS_ONE_INT64 = new Int64("ffe0000000000000"); // hex-encoded 2's complement
+    const EXPECTED_MAX_SIGNED_INT64 = new Int64("7fffffffffffffff"); // hex-encoded
+    const EXPECTED_MIN_SIGNED_INT64 = new Int64("8000000000000000"); // hex-encoded 2's complement
+    const EXPECTED_INT64_LIST = [
+      EXPECTED_SMALL_INT64,
+      EXPECTED_MAX_JS_SAFE_INT64,
+      EXPECTED_MIN_JS_SAFE_INT64,
+      EXPECTED_MAX_JS_SAFE_PLUS_ONE_INT64,
+      EXPECTED_MIN_JS_SAFE_MINUS_ONE_INT64,
+      EXPECTED_MAX_SIGNED_INT64,
+      EXPECTED_MIN_SIGNED_INT64
+    ];
+
+    assert.ok(EXPECTED_SMALL_INT64.equals(Int64Test.SMALL_INT64));
+    assert.ok(EXPECTED_MAX_JS_SAFE_INT64.equals(Int64Test.MAX_JS_SAFE_INT64));
+    assert.ok(EXPECTED_MIN_JS_SAFE_INT64.equals(Int64Test.MIN_JS_SAFE_INT64));
+    assert.ok(
+      EXPECTED_MAX_JS_SAFE_PLUS_ONE_INT64.equals(
+        Int64Test.MAX_JS_SAFE_PLUS_ONE_INT64
+      )
+    );
+    assert.ok(
+      EXPECTED_MIN_JS_SAFE_MINUS_ONE_INT64.equals(
+        Int64Test.MIN_JS_SAFE_MINUS_ONE_INT64
+      )
+    );
+    assert.ok(EXPECTED_MAX_SIGNED_INT64.equals(Int64Test.MAX_SIGNED_INT64));
+    assert.ok(EXPECTED_MIN_SIGNED_INT64.equals(Int64Test.MIN_SIGNED_INT64));
+    assert.equal(
+      EXPECTED_SMALL_INT64_AS_NUMBER,
+      Int64Test.SMALL_INT64.toNumber()
+    );
+    assert.equal(
+      Number.MAX_SAFE_INTEGER,
+      Int64Test.MAX_JS_SAFE_INT64.toNumber()
+    );
+    assert.equal(
+      Number.MIN_SAFE_INTEGER,
+      Int64Test.MIN_JS_SAFE_INT64.toNumber()
+    );
+
+    for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
+      assert.ok(EXPECTED_INT64_LIST[i].equals(Int64Test.INT64_LIST[i]));
+    }
+    console.log('Int64 test -- ends');
+  });
+