diff --git a/bfps/TEST.py b/bfps/TEST.py
index 9a36cbfcdd6bc459a7150101c439ef3f4ebb60ac..a95756e10db814134537c44e572f8b22110139a4 100644
--- a/bfps/TEST.py
+++ b/bfps/TEST.py
@@ -37,6 +37,7 @@ import warnings
 import bfps
 from ._code import _code
 from bfps import tools
+from bfps import DNS
 
 class TEST(_code):
     """This class is meant to stitch together the C++ code into a final source file,
@@ -339,6 +340,20 @@ class TEST(_code):
                                 pbase_shape +
                                 (ncomponents,)),
                             dtype = np.float)
+                    if type(particle_initial_condition) == type(None):
+                        ofile['tracers0/state/0'][:] = np.random.random(pbase_shape + (ncomponents,))*2*np.pi
+                    else:
+                        ofile['tracers0/state/0'][:] = particle_initial_condition
+                with h5py.File(os.path.join(self.work_dir, self.simname + '_input.h5'), 'a') as ofile:
+                    data = DNS.generate_vector_field(self,
+                           write_to_file = False,
+                           spectra_slope = 1.0,
+                           amplitude = 0.05)
+                    ofile['vorticity/complex/{0}'.format(0)] = data
+                with h5py.File(os.path.join(self.work_dir, self.simname + '_output.h5'), 'a') as ofile:
+                    ofile.require_group('tracers0')
+                    for kk in ['velocity', 'vorticity', 'velocity_gradient']:
+                        ofile['tracers0'].require_group(kk)
         self.run(
                 nb_processes = opt.nb_processes,
                 nb_threads_per_process = opt.nb_threads_per_process,
diff --git a/bfps/cpp/full_code/test_interpolation.cpp b/bfps/cpp/full_code/test_interpolation.cpp
index 023b40f8f04cb0b0d6e8a91b92a40773ba6efc10..2150d51f0240d97e7deb697297907e863da905a4 100644
--- a/bfps/cpp/full_code/test_interpolation.cpp
+++ b/bfps/cpp/full_code/test_interpolation.cpp
@@ -24,10 +24,12 @@ int test_interpolation<rnumber>::read_parameters(void)
 template <typename rnumber>
 int test_interpolation<rnumber>::initialize(void)
 {
+    this->read_parameters();
     this->vorticity = new field<rnumber, FFTW, THREE>(
             this->nx, this->ny, this->nz,
             this->comm,
             DEFAULT_FFTW_FLAG);
+    this->vorticity->real_space_representation = false;
 
     this->velocity = new field<rnumber, FFTW, THREE>(
             this->nx, this->ny, this->nz,
@@ -97,6 +99,7 @@ int test_interpolation<rnumber>::do_work()
 {
     std::string fname = this->simname + std::string("_input.h5");
     // read vorticity field
+    this->vorticity->real_space_representation = false;
     this->vorticity->io(
             fname,
             "vorticity",