new file mode 100644
--- /dev/null
+++ b/media/libstagefright/gtest/TestMP4Rust.cpp
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mp4_demuxer/MP4Metadata.h"
+
+#include <cstdint>
+#include <fstream>
+#include <vector>
+
+extern "C" bool read_box_from_buffer(uint8_t *buffer, size_t size);
+
+using namespace mp4_demuxer;
+using namespace mozilla;
+
+TEST(rust, MP4MetadataEmpty)
+{
+  bool rv;
+  rv = read_box_from_buffer(nullptr, 0);
+  EXPECT_EQ(rv, false);
+
+  size_t len = 4097;
+  rv = read_box_from_buffer(nullptr, len);
+  EXPECT_EQ(rv, false);
+
+  std::vector<uint8_t> buf;
+  rv = read_box_from_buffer(buf.data(), buf.size());
+  EXPECT_EQ(rv, false);
+
+  buf.reserve(len);
+  rv = read_box_from_buffer(buf.data(), buf.size());
+  EXPECT_EQ(rv, false);
+}
+
+TEST(rust, MP4Metadata)
+{
+  std::ifstream f("street.mp4");
+  ASSERT_TRUE(f.is_open());
+
+  size_t len = 4096;
+  std::vector<uint8_t> buf;
+  buf.reserve(len);
+  f.read(reinterpret_cast<char*>(buf.data()), buf.size());
+  bool rv = read_box_from_buffer(buf.data(), buf.size());
+  ASSERT_FALSE(rv); // Expected fail: need to trap eof.
+}

--- a/media/libstagefright/gtest/moz.build
+++ b/media/libstagefright/gtest/moz.build
@@ -5,11 +5,17 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 Library('stagefright_gtest')
 
 SOURCES += [
     'TestInterval.cpp',
 ]
 
+if CONFIG['MOZ_RUST']:
+    UNIFIED_SOURCES += ['TestMP4Rust.cpp',]
+    TEST_HARNESS_FILES.gtest += [
+        '../../../dom/media/test/street.mp4',
+    ]
+
 FINAL_LIBRARY = 'xul-gtest'
 
 FAIL_ON_WARNINGS = True