b.ResetTimer()
	for i := 0; i < b.N; i++ {
		_, err := p.TransformToStorage(ctx, v, dataCtx)
		if err != nil {
			b.Fatal(err)
		}
	}
	b.StopTimer()
}

func TestRoundTrip(t *testing.T) {
	lengths := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 128, 1024}

	aes16block, err := aes.NewCipher(bytes.Repeat([]byte("a"), 16))
	if err != nil {
		t.Fatal(err)
	}

	// thread with 80-bit precision and the Go runtime didn't
	// fix the FP control word.
	{8865794286000691 << 39, "4.87402195346389e+27"},
	{8865794286000692 << 39, "4.8740219534638903e+27"},
}

func TestRoundTrip(t *testing.T) {
	for _, tt := range roundTripCases {
		old := SetOptimize(false)
		s := FormatFloat(tt.f, 'g', -1, 64)
		if s != tt.s {
			t.Errorf("no-opt FormatFloat(%b) = %s, want %s", tt.f, s, tt.s)
		}

  status = file->Close();
  EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);
  if (!status.ok()) GTEST_SKIP() << "Close() not supported: " << status;
}

TEST_P(ModularFileSystemTest, TestRoundTrip) {
  const std::string filepath = GetURIForPath("a_file");
  std::unique_ptr<WritableFile> file;
  Status status = env_->NewWritableFile(filepath, &file);
  if (!status.ok())