diff --git a/lib/nodejs/test/int64.test.js b/lib/nodejs/test/int64.test.js
new file mode 100644
index 0000000..106e446
--- /dev/null
+++ b/lib/nodejs/test/int64.test.js
@@ -0,0 +1,81 @@
+/*
+ * 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.
+ */
+
+const Int64 = require("node-int64");
+const i64types = require("./gen-nodejs-es6/Int64Test_types.js");
+const test = require("tape");
+
+const cases = {
+  "should correctly generate Int64 constants": function(assert) {
+    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(i64types.SMALL_INT64));
+    assert.ok(EXPECTED_MAX_JS_SAFE_INT64.equals(i64types.MAX_JS_SAFE_INT64));
+    assert.ok(EXPECTED_MIN_JS_SAFE_INT64.equals(i64types.MIN_JS_SAFE_INT64));
+    assert.ok(
+      EXPECTED_MAX_JS_SAFE_PLUS_ONE_INT64.equals(
+        i64types.MAX_JS_SAFE_PLUS_ONE_INT64
+      )
+    );
+    assert.ok(
+      EXPECTED_MIN_JS_SAFE_MINUS_ONE_INT64.equals(
+        i64types.MIN_JS_SAFE_MINUS_ONE_INT64
+      )
+    );
+    assert.ok(EXPECTED_MAX_SIGNED_INT64.equals(i64types.MAX_SIGNED_INT64));
+    assert.ok(EXPECTED_MIN_SIGNED_INT64.equals(i64types.MIN_SIGNED_INT64));
+    assert.equal(
+      EXPECTED_SMALL_INT64_AS_NUMBER,
+      i64types.SMALL_INT64.toNumber()
+    );
+    assert.equal(
+      Number.MAX_SAFE_INTEGER,
+      i64types.MAX_JS_SAFE_INT64.toNumber()
+    );
+    assert.equal(
+      Number.MIN_SAFE_INTEGER,
+      i64types.MIN_JS_SAFE_INT64.toNumber()
+    );
+
+    for (let i = 0; i < EXPECTED_INT64_LIST.length; ++i) {
+      assert.ok(EXPECTED_INT64_LIST[i].equals(i64types.INT64_LIST[i]));
+    }
+    assert.end();
+  }
+};
+
+Object.keys(cases).forEach(function(caseName) {
+  test(caseName, cases[caseName]);
+});