diff --git a/CMakeLists.txt b/CMakeLists.txt
index c2d269c..ac83280 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,7 +48,7 @@ clangformat_targets()
 
 
 message(STATUS "Adding tests")
-FILE(GLOB ALL_FILES
+FILE(GLOB_RECURSE ALL_FILES
   CONFIGURE_DEPENDS
   tests/*
 )
@@ -62,3 +62,5 @@ endforeach()
 
 set_property(TEST three_regions.vpy PROPERTY WILL_FAIL true)
 set_property(TEST leak_with_global.vpy PROPERTY WILL_FAIL true)
+set_property(TEST modify_cown.vpy PROPERTY WILL_FAIL true)
+set_property(TEST read_region.vpy PROPERTY WILL_FAIL true)
diff --git a/tests/invalid_cowns/modify_cown.vpy b/tests/invalid_cowns/modify_cown.vpy
new file mode 100644
index 0000000..c7f043b
--- /dev/null
+++ b/tests/invalid_cowns/modify_cown.vpy
@@ -0,0 +1,7 @@
+
+# A simple cown
+a = {}
+region a
+co = cown a
+
+co.other = {}
diff --git a/tests/invalid_cowns/read_region.vpy b/tests/invalid_cowns/read_region.vpy
new file mode 100644
index 0000000..dfc7958
--- /dev/null
+++ b/tests/invalid_cowns/read_region.vpy
@@ -0,0 +1,7 @@
+
+# A simple cown
+a = {}
+region a
+co = cown a
+
+dummy = co.region