diff --git a/compiler/tests/10_write_driver_array_wmask_test.py b/compiler/tests/10_write_driver_array_wmask_test.py
old mode 100644
new mode 100755
diff --git a/compiler/tests/10_write_mask_and_array_test.py b/compiler/tests/10_write_mask_and_array_test.py
old mode 100644
new mode 100755
index 830448eb..91155467
--- a/compiler/tests/10_write_mask_and_array_test.py
+++ b/compiler/tests/10_write_mask_and_array_test.py
@@ -27,7 +27,7 @@ class write_mask_and_array_test(openram_test):
         a = factory.create(module_type="write_mask_and_array", columns=8, word_size=8, write_size=4)
         self.local_check(a)
 
-        debug.info(2, "Testing write_mask_and_array for columns=8, word_size=8, write_size=4")
+        debug.info(2, "Testing write_mask_and_array for columns=16, word_size=16, write_size=4")
         a = factory.create(module_type="write_mask_and_array", columns=16, word_size=16, write_size=4)
         self.local_check(a)
 
@@ -58,4 +58,4 @@ if __name__ == "__main__":
     (OPTS, args) = globals.parse_args()
     del sys.argv[1:]
     header(__file__, OPTS.tech_name)
-    unittest.main(testRunner=debugTestRunner())
\ No newline at end of file
+    unittest.main(testRunner=debugTestRunner())
diff --git a/compiler/tests/18_port_data_wmask_test.py b/compiler/tests/18_port_data_wmask_test.py
old mode 100644
new mode 100755
index df5f55dc..e9b70337
--- a/compiler/tests/18_port_data_wmask_test.py
+++ b/compiler/tests/18_port_data_wmask_test.py
@@ -1,4 +1,4 @@
-1#!/usr/bin/env python3
+#!/usr/bin/env python3
 # See LICENSE for licensing information.
 #
 # Copyright (c) 2016-2019 Regents of the University of California
@@ -110,4 +110,4 @@ if __name__ == "__main__":
     (OPTS, args) = globals.parse_args()
     del sys.argv[1:]
     header(__file__, OPTS.tech_name)
-    unittest.main(testRunner=debugTestRunner())
\ No newline at end of file
+    unittest.main(testRunner=debugTestRunner())
diff --git a/compiler/tests/19_single_bank_wmask_test.py b/compiler/tests/19_single_bank_wmask_test.py
new file mode 100755
index 00000000..439ffeba
--- /dev/null
+++ b/compiler/tests/19_single_bank_wmask_test.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+# See LICENSE for licensing information.
+#
+# Copyright (c) 2016-2019 Regents of the University of California and The Board
+# of Regents for the Oklahoma Agricultural and Mechanical College
+# (acting for and on behalf of Oklahoma State University)
+# All rights reserved.
+#
+import unittest
+from testutils import *
+import sys,os
+sys.path.append(os.getenv("OPENRAM_HOME"))
+import globals
+from globals import OPTS
+from sram_factory import factory
+import debug
+
+class single_bank_wmask_test(openram_test):
+
+    def runTest(self):
+        globals.init_openram("config_{0}".format(OPTS.tech_name))
+        from sram_config import sram_config
+
+
+        c = sram_config(word_size=8,
+                        write_size=4,
+                        num_words=16,
+                        num_banks=1)
+
+        c.words_per_row=1
+        factory.reset()
+        c.recompute_sizes()
+        debug.info(1, "No column mux")
+        a = factory.create("bank", sram_config=c)
+        self.local_check(a)
+
+        c.num_words=32
+        c.words_per_row=2
+        factory.reset()
+        c.recompute_sizes()
+        debug.info(1, "Two way column mux")
+        a = factory.create("bank", sram_config=c)
+        self.local_check(a)
+
+        c.num_words=64
+        c.words_per_row=4
+        factory.reset()
+        c.recompute_sizes()
+        debug.info(1, "Four way column mux")
+        a = factory.create("bank", sram_config=c)
+        self.local_check(a)
+
+        c.num_words=128
+        c.words_per_row=8
+        factory.reset()
+        c.recompute_sizes()
+        debug.info(1, "Eight way column mux")
+        a = factory.create("bank", sram_config=c)
+        self.local_check(a)
+        
+        globals.end_openram()
+        
+# run the test from the command line
+if __name__ == "__main__":
+    (OPTS, args) = globals.parse_args()
+    del sys.argv[1:]
+    header(__file__, OPTS.tech_name)
+    unittest.main(testRunner=debugTestRunner())
diff --git a/compiler/tests/20_sram_1bank_nomux_wmask_test.py b/compiler/tests/20_sram_1bank_nomux_wmask_test.py
old mode 100644
new mode 100755