diff --git a/src/kudu/util/env-test.cc b/src/kudu/util/env-test.cc
index 7724d93..f3ef1ac 100644
--- a/src/kudu/util/env-test.cc
+++ b/src/kudu/util/env-test.cc
@@ -745,4 +745,28 @@ TEST_F(TestEnv, TestCopyFile) {
   NO_FATALS(ReadAndVerifyTestData(copy.get(), 0, kFileSize));
 }
 
+// Test Memenv PreAllocate().
+TEST_F(TestEnv, TestMemEnvPreAllocate) {
+  SeedRandom();
+  gscoped_ptr<Env> mem(NewMemEnv(Env::Default()));
+  string test_string = "hello, world!\n";
+
+  string test_path = "test";
+  gscoped_ptr<WritableFile> test_file;
+  WritableFileOptions opts;
+  opts.mmap_file = false;
+  ASSERT_OK(mem->NewWritableFile(opts, test_path, &test_file));
+  ASSERT_OK(test_file->PreAllocate(test_string.size()));
+  ASSERT_OK(test_file->Append(Slice(test_string.data(), test_string.size())));
+  ASSERT_OK(test_file->Close());
+
+  Slice data;
+  gscoped_ptr<uint8_t> scratch(new uint8_t[1024]);
+  gscoped_ptr<RandomAccessFile> random_file;
+  ASSERT_OK(mem->NewRandomAccessFile(test_path, &random_file));
+  ASSERT_OK(env_util::ReadFully(random_file.get(), 0, test_string.size(),
+                                &data, scratch.get()));
+  ASSERT_EQ(test_string, data.ToString());
+}
+
 }  // namespace kudu