diff --git a/tests/population/grid_tests.py b/tests/population/grid_tests.py
index 538ae76ba2d96214ce98b8e60b420e018c8263cd..f78b7d7afabd76ae3aa009e9b4f5f24ed2577d25 100644
--- a/tests/population/grid_tests.py
+++ b/tests/population/grid_tests.py
@@ -61,32 +61,32 @@ test_pop.set(
 
 
 ## Custom logging with bigger print statement:
-test_pop.set(M_1=100, M_2=1, metallicity=0.0002, orbital_period=500000000)
-test_pop.set(
-    C_logging_code="""
-    if(stardata->star[0].stellar_type>=MS)
-    {
-        if (stardata->model.time < stardata->model.max_evolution_time)
-        {
-            Printf("DAVID_SCO %30.12e %g %g %g %g %d %d\\n",
-                // 
-                stardata->model.time, // 1
-
-                stardata->star[0].mass, //2
-                stardata->previous_stardata->star[0].mass, //3
-
-                stardata->star[0].radius, //4
-                stardata->previous_stardata->star[0].radius, //5
-
-                stardata->star[0].stellar_type, //6
-                stardata->previous_stardata->star[0].stellar_type //7
-          );
-        };
-        /* Kill the simulation to save time */
-        // stardata->model.max_evolution_time = stardata->model.time - stardata->model.dtm;
-    };
-"""
-)
+# test_pop.set(M_1=100, M_2=1, metallicity=0.0002, orbital_period=500000000)
+# test_pop.set(
+#     C_logging_code="""
+#     if(stardata->star[0].stellar_type>=MS)
+#     {
+#         if (stardata->model.time < stardata->model.max_evolution_time)
+#         {
+#             Printf("DAVID_SCO %30.12e %g %g %g %g %d %d\\n",
+#                 // 
+#                 stardata->model.time, // 1
+
+#                 stardata->star[0].mass, //2
+#                 stardata->previous_stardata->star[0].mass, //3
+
+#                 stardata->star[0].radius, //4
+#                 stardata->previous_stardata->star[0].radius, //5
+
+#                 stardata->star[0].stellar_type, //6
+#                 stardata->previous_stardata->star[0].stellar_type //7
+#           );
+#         };
+#         /* Kill the simulation to save time */
+#         // stardata->model.max_evolution_time = stardata->model.time - stardata->model.dtm;
+#     };
+# """
+# )
 # test_pop.evolve_population()
 
 
@@ -103,74 +103,73 @@ test_pop.set(
 
 ################# Parse function
 ## Testing some stuff out with giving a parse_function. 
-test_pop.set(
-    C_logging_code="""
-    if(stardata->star[0].stellar_type>=NS)
-    {
-        if (stardata->model.time < stardata->model.max_evolution_time)
-        {
-            Printf("DAVID_SCO %30.12e %g %g %g %g %d %d\\n",
-                // 
-                stardata->model.time, // 1
-
-                stardata->star[0].mass, //2
-                stardata->previous_stardata->star[0].mass, //3
-
-                stardata->star[0].radius, //4
-                stardata->previous_stardata->star[0].radius, //5
-
-                stardata->star[0].stellar_type, //6
-                stardata->previous_stardata->star[0].stellar_type //7
-          );
-        };
-        /* Kill the simulation to save time */
-        stardata->model.max_evolution_time = stardata->model.time - stardata->model.dtm;
-    };
-"""
-)
-
-
-def output_lines(output):
-    """
-    Function that outputs the lines that were recieved from the binary_c run. 
-    """
-    return output.splitlines()
-
-def parse_function(self, output):
-    # extract info from the population instance
-    # TODO: think about whether this is smart. Passing around this object might be an overkill
-
-    # Get some information from the 
-    data_dir = self.custom_options['data_dir']
-    base_filename = self.custom_options['base_filename']
-    outfilename = os.path.join(data_dir, base_filename)
-
-    # TODO: make population settings available in this function
-    for el in output_lines(output):
-        headerline = el.split()[0]
-
-        if (headerline=='DAVID_SCO'):
-            parameters = ['time', 'mass_1', 'prev_mass_1', 'radius_1', 'prev_radius_1', 'stellar_type_1', 'prev_stellar_type_1']
-            values = el.split()[1:]
-            seperator='\t'
-
-            if not os.path.exists(outfilename):
-                with open(outfilename, 'w') as f:
-                    f.write(seperator.join(parameters)+'\n')
-
-            with open(outfilename, 'a') as f:
-                f.write(seperator.join(values)+'\n')
-
-
-#test_pop.evolve_single(parse_function)
-test_pop.set(M_1=90, data_dir=os.path.join(os.environ['BINARYC_DATA_ROOT'], 'testing_python'), base_filename='test_pop.dat')
-test_pop.evolve_single(parse_function)
-test_pop.set(M_1=80)
-test_pop.evolve_single(parse_function)
-test_pop.set(M_1=70)
-test_pop.evolve_single(parse_function)
-test_pop.set(M_1=60)
-test_pop.evolve_single(parse_function)
+# test_pop.set(
+#     C_logging_code="""
+#     if(stardata->star[0].stellar_type>=NS)
+#     {
+#         if (stardata->model.time < stardata->model.max_evolution_time)
+#         {
+#             Printf("DAVID_SCO %30.12e %g %g %g %g %d %d\\n",
+#                 // 
+#                 stardata->model.time, // 1
+
+#                 stardata->star[0].mass, //2
+#                 stardata->previous_stardata->star[0].mass, //3
+
+#                 stardata->star[0].radius, //4
+#                 stardata->previous_stardata->star[0].radius, //5
+
+#                 stardata->star[0].stellar_type, //6
+#                 stardata->previous_stardata->star[0].stellar_type //7
+#           );
+#         };
+#         /* Kill the simulation to save time */
+#         stardata->model.max_evolution_time = stardata->model.time - stardata->model.dtm;
+#     };
+# """
+# )
+
+# def output_lines(output):
+#     """
+#     Function that outputs the lines that were recieved from the binary_c run. 
+#     """
+#     return output.splitlines()
+
+# def parse_function(self, output):
+#     # extract info from the population instance
+#     # TODO: think about whether this is smart. Passing around this object might be an overkill
+
+#     # Get some information from the 
+#     data_dir = self.custom_options['data_dir']
+#     base_filename = self.custom_options['base_filename']
+#     outfilename = os.path.join(data_dir, base_filename)
+
+#     # TODO: make population settings available in this function
+#     for el in output_lines(output):
+#         headerline = el.split()[0]
+
+#         if (headerline=='DAVID_SCO'):
+#             parameters = ['time', 'mass_1', 'prev_mass_1', 'radius_1', 'prev_radius_1', 'stellar_type_1', 'prev_stellar_type_1']
+#             values = el.split()[1:]
+#             seperator='\t'
+
+#             if not os.path.exists(outfilename):
+#                 with open(outfilename, 'w') as f:
+#                     f.write(seperator.join(parameters)+'\n')
+
+#             with open(outfilename, 'a') as f:
+#                 f.write(seperator.join(values)+'\n')
+
+
+# #test_pop.evolve_single(parse_function)
+# test_pop.set(M_1=90, data_dir=os.path.join(os.environ['BINARYC_DATA_ROOT'], 'testing_python'), base_filename='test_pop.dat')
+# test_pop.evolve_single(parse_function)
+# test_pop.set(M_1=80)
+# test_pop.evolve_single(parse_function)
+# test_pop.set(M_1=70)
+# test_pop.evolve_single(parse_function)
+# test_pop.set(M_1=60)
+# test_pop.evolve_single(parse_function)
 
 ##################
 ## CHeck size of commands:
@@ -203,3 +202,34 @@ test_pop.evolve_single(parse_function)
 # plt.savefig('sizes_for_commands.png')
 # plt.show()
 
+
+
+### Grid generating test.
+test_pop.add_grid_variable(
+    name='lnm1',
+    longname='log primary mass',
+    valuerange=[10, 20],
+    resolution='10',
+    spacingfunc='const()',
+    precode='m2=m1**2',
+    probdist='flat()',
+    dphasevol='',
+    parameter_name='M_1',
+    condition='',
+)
+
+### Grid generating test.
+test_pop.add_grid_variable(
+    name='period',
+    longname='period',
+    valuerange=['m1', 20],
+    resolution='10',
+    spacingfunc='const()',
+    precode='',
+    probdist='flat()',
+    parameter_name='orbital_period',
+    dphasevol='',
+    condition='',
+)
+
+test_pop.generate_grid_code()
\ No newline at end of file