diff --git a/compiler/characterizer/delay.py b/compiler/characterizer/delay.py
index e140ab24..d92e97fa 100644
--- a/compiler/characterizer/delay.py
+++ b/compiler/characterizer/delay.py
@@ -6,6 +6,7 @@ import tech
 import math
 import stimuli
 import charutils as ch
+import utils
 
 OPTS = globals.get_opts()
 
diff --git a/compiler/tests/00_code_format_check_test.py b/compiler/tests/00_code_format_check_test.py
index b732edde..04ea2e99 100644
--- a/compiler/tests/00_code_format_check_test.py
+++ b/compiler/tests/00_code_format_check_test.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python2.7
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/01_library_drc_test.py b/compiler/tests/01_library_drc_test.py
index 63f7f90e..ea1612ff 100644
--- a/compiler/tests/01_library_drc_test.py
+++ b/compiler/tests/01_library_drc_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test the library cells for DRC"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/02_library_lvs_test.py b/compiler/tests/02_library_lvs_test.py
index 356ad075..0ef925c6 100644
--- a/compiler/tests/02_library_lvs_test.py
+++ b/compiler/tests/02_library_lvs_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test the library cells for LVS"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/03_contact_test.py b/compiler/tests/03_contact_test.py
index 502a0e2f..5b068786 100644
--- a/compiler/tests/03_contact_test.py
+++ b/compiler/tests/03_contact_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test for DRC on basic contacts of different array sizes"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/03_path_test.py b/compiler/tests/03_path_test.py
index dd622a13..62a0ec0e 100644
--- a/compiler/tests/03_path_test.py
+++ b/compiler/tests/03_path_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test on a basic path"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/03_ptx_1finger_nmos_test.py b/compiler/tests/03_ptx_1finger_nmos_test.py
index 07d233e6..eec4f13c 100644
--- a/compiler/tests/03_ptx_1finger_nmos_test.py
+++ b/compiler/tests/03_ptx_1finger_nmos_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test on a basic parameterized transistors"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/03_ptx_1finger_pmos_test.py b/compiler/tests/03_ptx_1finger_pmos_test.py
index 7c9a012a..243f30de 100644
--- a/compiler/tests/03_ptx_1finger_pmos_test.py
+++ b/compiler/tests/03_ptx_1finger_pmos_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test on a basic parameterized transistors"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/03_ptx_3finger_nmos_test.py b/compiler/tests/03_ptx_3finger_nmos_test.py
index d146cea7..61257e49 100644
--- a/compiler/tests/03_ptx_3finger_nmos_test.py
+++ b/compiler/tests/03_ptx_3finger_nmos_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test on a basic parameterized transistors"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/03_ptx_3finger_pmos_test.py b/compiler/tests/03_ptx_3finger_pmos_test.py
index 603e0b64..ffcb5086 100644
--- a/compiler/tests/03_ptx_3finger_pmos_test.py
+++ b/compiler/tests/03_ptx_3finger_pmos_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test on a basic parameterized transistors"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/03_wire_test.py b/compiler/tests/03_wire_test.py
index b458d458..46b7eee5 100644
--- a/compiler/tests/03_wire_test.py
+++ b/compiler/tests/03_wire_test.py
@@ -2,7 +2,7 @@
 "Run a regresion test on a basic wire"
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/04_nand_2_test.py b/compiler/tests/04_nand_2_test.py
index 1472cb0d..308a8867 100644
--- a/compiler/tests/04_nand_2_test.py
+++ b/compiler/tests/04_nand_2_test.py
@@ -6,7 +6,7 @@ size 2_input nand gate that is nmos_width=2*tech.drc[minwidth_tx].
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/04_nand_3_test.py b/compiler/tests/04_nand_3_test.py
index d751a8a3..70972192 100644
--- a/compiler/tests/04_nand_3_test.py
+++ b/compiler/tests/04_nand_3_test.py
@@ -6,7 +6,7 @@ It generate only the minimum size 3_input nand gate that is nmos_width=3*tech.dr
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/04_nor_2_test.py b/compiler/tests/04_nor_2_test.py
index 746891eb..8ef09468 100644
--- a/compiler/tests/04_nor_2_test.py
+++ b/compiler/tests/04_nor_2_test.py
@@ -5,7 +5,7 @@ This module doesn't generate multi_finger 2_input nor gate
 It generate only the minimum size 2_input nor gate that is nmos_width=2*tech.drc[minwidth_tx]
 """
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/04_pinv_test.py b/compiler/tests/04_pinv_test.py
index ecbbb7e6..cdc35175 100644
--- a/compiler/tests/04_pinv_test.py
+++ b/compiler/tests/04_pinv_test.py
@@ -4,7 +4,7 @@ Run regresion tests on a parameterized inverter
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/04_wordline_driver_test.py b/compiler/tests/04_wordline_driver_test.py
index d5f6a7c4..a18b3c8c 100644
--- a/compiler/tests/04_wordline_driver_test.py
+++ b/compiler/tests/04_wordline_driver_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a wordline_driver array
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/05_bitcell_array_test.py b/compiler/tests/05_bitcell_array_test.py
index e794c72c..80dba9c1 100644
--- a/compiler/tests/05_bitcell_array_test.py
+++ b/compiler/tests/05_bitcell_array_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a basic array
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/06_hierarchical_decoder_test.py b/compiler/tests/06_hierarchical_decoder_test.py
index a087c5f3..6fc77d15 100644
--- a/compiler/tests/06_hierarchical_decoder_test.py
+++ b/compiler/tests/06_hierarchical_decoder_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a thierarchy_decoder.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/06_hierarchical_predecode2x4_test.py b/compiler/tests/06_hierarchical_predecode2x4_test.py
index 0114728e..3b630fe4 100644
--- a/compiler/tests/06_hierarchical_predecode2x4_test.py
+++ b/compiler/tests/06_hierarchical_predecode2x4_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a hierarchical_predecode2x4.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/06_hierarchical_predecode3x8_test.py b/compiler/tests/06_hierarchical_predecode3x8_test.py
index 6458513e..39f3517f 100644
--- a/compiler/tests/06_hierarchical_predecode3x8_test.py
+++ b/compiler/tests/06_hierarchical_predecode3x8_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a hierarchical_predecode3x8.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/07_single_level_column_mux_test.py b/compiler/tests/07_single_level_column_mux_test.py
index c810b865..35305102 100644
--- a/compiler/tests/07_single_level_column_mux_test.py
+++ b/compiler/tests/07_single_level_column_mux_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a single transistor column_mux.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/08_precharge_array_test.py b/compiler/tests/08_precharge_array_test.py
index 66fcb193..8b4d3e92 100644
--- a/compiler/tests/08_precharge_array_test.py
+++ b/compiler/tests/08_precharge_array_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a precharge array
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/09_sense_amp_array_test.py b/compiler/tests/09_sense_amp_array_test.py
index 2974712e..d29f496d 100644
--- a/compiler/tests/09_sense_amp_array_test.py
+++ b/compiler/tests/09_sense_amp_array_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a sense amp array
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/10_write_driver_array_test.py b/compiler/tests/10_write_driver_array_test.py
index 559107f8..4148e865 100644
--- a/compiler/tests/10_write_driver_array_test.py
+++ b/compiler/tests/10_write_driver_array_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a write driver array
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/11_ms_flop_array_test.py b/compiler/tests/11_ms_flop_array_test.py
index 33680a53..0c26a001 100644
--- a/compiler/tests/11_ms_flop_array_test.py
+++ b/compiler/tests/11_ms_flop_array_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a dff_array.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/13_control_logic_test.py b/compiler/tests/13_control_logic_test.py
index 37c39ca1..567f3584 100644
--- a/compiler/tests/13_control_logic_test.py
+++ b/compiler/tests/13_control_logic_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a control_logic
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/14_logic_effort_dc_test.py b/compiler/tests/14_logic_effort_dc_test.py
index 48e8b768..9cd3c2ea 100644
--- a/compiler/tests/14_logic_effort_dc_test.py
+++ b/compiler/tests/14_logic_effort_dc_test.py
@@ -4,7 +4,7 @@ Run a test on a delay chain
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/15_tri_gate_array_test.py b/compiler/tests/15_tri_gate_array_test.py
index ef388696..3daa7556 100644
--- a/compiler/tests/15_tri_gate_array_test.py
+++ b/compiler/tests/15_tri_gate_array_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a tri_gate_array.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/16_replica_bitline_test.py b/compiler/tests/16_replica_bitline_test.py
index 2b0aaa9a..c8e732c8 100644
--- a/compiler/tests/16_replica_bitline_test.py
+++ b/compiler/tests/16_replica_bitline_test.py
@@ -4,7 +4,7 @@ Run a test on a delay chain
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/19_bank_test.py b/compiler/tests/19_bank_test.py
index aef9068b..0bd67b5b 100644
--- a/compiler/tests/19_bank_test.py
+++ b/compiler/tests/19_bank_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/20_sram_1bank_test.py b/compiler/tests/20_sram_1bank_test.py
index d1b553ae..5ca96ab0 100644
--- a/compiler/tests/20_sram_1bank_test.py
+++ b/compiler/tests/20_sram_1bank_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a 1 bank SRAM
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/20_sram_2bank_test.py b/compiler/tests/20_sram_2bank_test.py
index b07bf1a5..9f87d55b 100644
--- a/compiler/tests/20_sram_2bank_test.py
+++ b/compiler/tests/20_sram_2bank_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a 2 bank SRAM
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/20_sram_4bank_test.py b/compiler/tests/20_sram_4bank_test.py
index beacc5e2..146b04fe 100644
--- a/compiler/tests/20_sram_4bank_test.py
+++ b/compiler/tests/20_sram_4bank_test.py
@@ -4,7 +4,7 @@ Run a regresion test on a 4 bank SRAM
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/21_hspice_delay_test.py b/compiler/tests/21_hspice_delay_test.py
index e2245afc..48a74dcc 100644
--- a/compiler/tests/21_hspice_delay_test.py
+++ b/compiler/tests/21_hspice_delay_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header,isclose
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
@@ -63,11 +63,7 @@ class timing_sram_test(unittest.TestCase):
             self.assertTrue(False) # other techs fail
 
         os.remove(tempspice)
-
-def isclose(value1,value2):
-    """ This is used to compare relative values for convergence. """
-    return (abs(value1 - value2) / max(value1,value2) <= 1e-2)
-                        
+           
 
 # instantiate a copdsay of the class to actually run the test
 if __name__ == "__main__":
diff --git a/compiler/tests/21_hspice_hold_test.py b/compiler/tests/21_hspice_hold_test.py
index 74fe2e7d..8bc48afa 100644
--- a/compiler/tests/21_hspice_hold_test.py
+++ b/compiler/tests/21_hspice_hold_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header,isclose
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
@@ -44,10 +44,6 @@ class timing_setup_test(unittest.TestCase):
         else:
             self.assertTrue(False) # other techs fail
 
-def isclose(value1,value2):
-    """ This is used to compare relative values for convergence. """
-    return (abs(value1 - value2) / max(value1,value2) <= 1e-2)
-
 
 # instantiate a copdsay of the class to actually run the test
 if __name__ == "__main__":
diff --git a/compiler/tests/21_hspice_setup_test.py b/compiler/tests/21_hspice_setup_test.py
index ac3e66ff..e60e937c 100644
--- a/compiler/tests/21_hspice_setup_test.py
+++ b/compiler/tests/21_hspice_setup_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header,isclose
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
@@ -44,11 +44,6 @@ class timing_setup_test(unittest.TestCase):
         else:
             self.assertTrue(False) # other techs fail
 
-def isclose(value1,value2):
-    """ This is used to compare relative values for convergence. """
-    return (abs(value1 - value2) / max(value1,value2) <= 1e-2)
-
-
 # instantiate a copdsay of the class to actually run the test
 if __name__ == "__main__":
     (OPTS, args) = globals.parse_args()
diff --git a/compiler/tests/21_ngspice_delay_test.py b/compiler/tests/21_ngspice_delay_test.py
index 05287ee4..17979d41 100644
--- a/compiler/tests/21_ngspice_delay_test.py
+++ b/compiler/tests/21_ngspice_delay_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header,isclose
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
@@ -64,11 +64,6 @@ class timing_sram_test(unittest.TestCase):
 
         os.remove(tempspice)
 
-def isclose(value1,value2):
-    """ This is used to compare relative values for convergence. """
-    return (abs(value1 - value2) / max(value1,value2) <= 1e-2)
-                        
-
 # instantiate a copdsay of the class to actually run the test
 if __name__ == "__main__":
     (OPTS, args) = globals.parse_args()
diff --git a/compiler/tests/21_ngspice_hold_test.py b/compiler/tests/21_ngspice_hold_test.py
index 4e7a92ce..de7c77c7 100644
--- a/compiler/tests/21_ngspice_hold_test.py
+++ b/compiler/tests/21_ngspice_hold_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header,isclose
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
@@ -39,16 +39,11 @@ class timing_setup_test(unittest.TestCase):
             self.assertTrue(isclose(one_setup_time,-0.0048828125))
             self.assertTrue(isclose(zero_setup_time,-0.010986328125))
         elif OPTS.tech_name == "scn3me_subm":
-            self.assertTrue(isclose(one_setup_time,0.04638671875))
+            self.assertTrue(isclose(one_setup_time,0.45654296875)) # diff than hspice
             self.assertTrue(isclose(zero_setup_time,-0.0830078125))
         else:
             self.assertTrue(False) # other techs fail
 
-def isclose(value1,value2):
-    """ This is used to compare relative values for convergence. """
-    return (abs(value1 - value2) / max(value1,value2) <= 1e-2)
-
-
 # instantiate a copdsay of the class to actually run the test
 if __name__ == "__main__":
     (OPTS, args) = globals.parse_args()
diff --git a/compiler/tests/21_ngspice_setup_test.py b/compiler/tests/21_ngspice_setup_test.py
index 6b2fce53..902f3c03 100644
--- a/compiler/tests/21_ngspice_setup_test.py
+++ b/compiler/tests/21_ngspice_setup_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header,isclose
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
@@ -38,16 +38,11 @@ class timing_setup_test(unittest.TestCase):
             self.assertTrue(isclose(one_setup_time,0.0146484375)) 
             self.assertTrue(isclose(zero_setup_time,0.008544921875)) 
         elif OPTS.tech_name == "scn3me_subm":
-            self.assertTrue(isclose(one_setup_time,0.0927734375))
+            self.assertTrue(isclose(one_setup_time,0.09521484375)) #diff than hspice
             self.assertTrue(isclose(zero_setup_time,-0.0244140625))
         else:
             self.assertTrue(False) # other techs fail
 
-def isclose(value1,value2):
-    """ This is used to compare relative values for convergence. """
-    return (abs(value1 - value2) / max(value1,value2) <= 1e-2)
-
-
 # instantiate a copdsay of the class to actually run the test
 if __name__ == "__main__":
     (OPTS, args) = globals.parse_args()
diff --git a/compiler/tests/22_pex_func_test_with_pinv.py b/compiler/tests/22_pex_func_test_with_pinv.py
index 58c40e18..4f79fcb6 100644
--- a/compiler/tests/22_pex_func_test_with_pinv.py
+++ b/compiler/tests/22_pex_func_test_with_pinv.py
@@ -4,7 +4,7 @@ Run a regression test on an extracted SRAM to ensure functionality.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/22_sram_func_test.py b/compiler/tests/22_sram_func_test.py
index 5c7bc6c3..70bea6d4 100644
--- a/compiler/tests/22_sram_func_test.py
+++ b/compiler/tests/22_sram_func_test.py
@@ -4,7 +4,7 @@ Run a regresion test on various srams
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/23_lib_sram_test.py b/compiler/tests/23_lib_sram_test.py
index 3c2d226c..75937648 100644
--- a/compiler/tests/23_lib_sram_test.py
+++ b/compiler/tests/23_lib_sram_test.py
@@ -4,7 +4,7 @@ Check the .lib file for an SRAM
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/24_lef_sram_test.py b/compiler/tests/24_lef_sram_test.py
index 2a349502..b1c4c565 100644
--- a/compiler/tests/24_lef_sram_test.py
+++ b/compiler/tests/24_lef_sram_test.py
@@ -4,7 +4,7 @@ Check the LEF file for an SRMA
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/25_verilog_sram_test.py b/compiler/tests/25_verilog_sram_test.py
index dc628081..a1aed704 100644
--- a/compiler/tests/25_verilog_sram_test.py
+++ b/compiler/tests/25_verilog_sram_test.py
@@ -4,7 +4,7 @@ Check the  .v file for an SRAM
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/30_openram_test.py b/compiler/tests/30_openram_test.py
index ce0a2a05..cf5ddf70 100644
--- a/compiler/tests/30_openram_test.py
+++ b/compiler/tests/30_openram_test.py
@@ -6,7 +6,7 @@ check that these files are right.
 """
 
 import unittest
-from header import header
+from testutils import header
 import sys,os
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
diff --git a/compiler/tests/sram_2_16_1_freepdk45.gds b/compiler/tests/sram_2_16_1_freepdk45.gds
deleted file mode 100644
index 2be62057..00000000
Binary files a/compiler/tests/sram_2_16_1_freepdk45.gds and /dev/null differ
diff --git a/compiler/tests/sram_2_16_1_freepdk45.lef b/compiler/tests/sram_2_16_1_freepdk45.lef
deleted file mode 100644
index e69de29b..00000000
diff --git a/compiler/tests/header.py b/compiler/tests/testutils.py
similarity index 52%
rename from compiler/tests/header.py
rename to compiler/tests/testutils.py
index 194a301d..f1280bdc 100644
--- a/compiler/tests/header.py
+++ b/compiler/tests/testutils.py
@@ -1,4 +1,16 @@
 
+
+def isclose(value1,value2,error_tolerance=1e-2):
+    """ This is used to compare relative values.. """
+    import debug
+    relative_diff = abs(value1 - value2) / max(value1,value2)
+    check = relative_diff <= error_tolerance
+    if not check:
+        debug.info(2,"NOT CLOSE {0} {1} relative diff={2}".format(value1,value2,relative_diff))
+    else:
+        debug.info(2,"CLOSE {0} {1} relative diff={2}".format(value1,value2,relative_diff))
+    return (check)
+
 def header(str, tec):
     tst = "Running Test for:"
     print "\n"
diff --git a/compiler/utils.py b/compiler/utils.py
index 4f00563a..5034cb53 100644
--- a/compiler/utils.py
+++ b/compiler/utils.py
@@ -41,3 +41,7 @@ def auto_measure_libcell(pin_list, name, units, layer):
     for pin in pin_list:
         cell[str(pin)] = gdsPinToOffset(cell_vlsi.readPin(str(pin)))
     return cell
+
+
+
+