message: Update lmdb_dataset_op_test.cc
  Use `TensorFlowSrcRoot()` to get the tensorflow root path instead of the "tensorflow" path directly
diff: @@ -14,6 +14,7 @@ limitations under the License.
  #include "tensorflow/core/kernels/data/dataset_test_base.h"
  #include "tensorflow/core/lib/io/path.h"
  #include "tensorflow/core/platform/env.h"
  +#include "tensorflow/core/platform/test.h"
  namespace tensorflow {
  namespace data {
  @@ -23,7 +24,7 @@ namespace {
  constexpr char kNodeName[] = "lmdb_dataset";
  constexpr char kIteratorPrefix[] = "Iterator";
  constexpr char kDataFileName[] = "data.mdb";
  -constexpr char kDataFileLoc[] = "tensorflow/core/lib/lmdb/testdata";
  +constexpr char kDataFileLoc[] = "core/lib/lmdb/testdata";
  class LMDBDatasetParams : public DatasetParams {
  public:
  @@ -69,7 +70,8 @@ class LMDBDatasetOpTest : public DatasetOpsTestBaseV2 {};
  // This copying is necessary because LMDB creates lock files adjacent
  // to files that it reads.
  string MaybeCopyDataFile() {
  - string src_loc = io::JoinPath(kDataFileLoc, kDataFileName);
  + string src_loc =
  + io::JoinPath(testing::TensorFlowSrcRoot(), kDataFileLoc, kDataFileName);
  string dest_loc = io::JoinPath(testing::TmpDir(), kDataFileName);
  FileSystem* fs; // Pointer to singleton
  