diff --git a/aos/flatbuffers_test.cc b/aos/flatbuffers_test.cc
index e3030f1..f37af53 100644
--- a/aos/flatbuffers_test.cc
+++ b/aos/flatbuffers_test.cc
@@ -1,9 +1,10 @@
 #include "aos/flatbuffers.h"
 
-#include "gtest/gtest.h"
-
+#include "absl/strings/str_cat.h"
 #include "aos/json_to_flatbuffer.h"
 #include "aos/json_to_flatbuffer_generated.h"
+#include "aos/testing/tmpdir.h"
+#include "gtest/gtest.h"
 
 namespace aos {
 namespace testing {
@@ -21,5 +22,38 @@
   EXPECT_FALSE(empty.Verify());
 }
 
+// Tests the ability to map a flatbuffer on disk to memory
+TEST(FlatbufferMMapTest, Verify) {
+  FlatbufferDetachedBuffer<Configuration> fb =
+      JsonToFlatbuffer<Configuration>("{\"foo_int\": 3}");
+
+  const std::string fb_path = absl::StrCat(TestTmpDir(), "/fb.bfbs");
+  WriteFlatbufferToFile(fb_path, fb);
+
+  FlatbufferMMap<Configuration> fb_mmap(fb_path);
+  EXPECT_TRUE(fb.Verify());
+  EXPECT_TRUE(fb_mmap.Verify());
+  ASSERT_EQ(fb_mmap.message().foo_int(), 3);
+
+  // Verify that copying works
+  {
+    FlatbufferMMap<Configuration> fb_mmap2(fb_path);
+    fb_mmap2 = fb_mmap;
+    EXPECT_TRUE(fb_mmap.Verify());
+    EXPECT_TRUE(fb_mmap2.Verify());
+    ASSERT_EQ(fb_mmap2.message().foo_int(), 3);
+    ASSERT_EQ(fb_mmap.message().foo_int(), 3);
+  }
+  EXPECT_TRUE(fb_mmap.Verify());
+  ASSERT_EQ(fb_mmap.message().foo_int(), 3);
+
+  // Verify that moving works
+  {
+    FlatbufferMMap<Configuration> fb_mmap3(fb_path);
+    fb_mmap3 = std::move(fb_mmap);
+    EXPECT_TRUE(fb_mmap3.Verify());
+    ASSERT_EQ(fb_mmap3.message().foo_int(), 3);
+  }
+}
 }  // namespace testing
 }  // namespace aos