diff --git a/_examples/hi/test.py b/_examples/hi/test.py
index 22745c3..0179214 100644
--- a/_examples/hi/test.py
+++ b/_examples/hi/test.py
@@ -106,6 +106,21 @@ try:
 except Exception, err:
     print "caught:", err, "| err-type:",type(err)
     pass
+
+try:
+    hi.Person("name","2")
+    print "*ERROR* no exception raised!"
+except Exception, err:
+    print "caught:", err, "| err-type:",type(err)
+    pass
+
+try:
+    hi.Person("name",2,3)
+    print "*ERROR* no exception raised!"
+except Exception, err:
+    print "caught:", err, "| err-type:",type(err)
+    pass
+
 p = hi.Person("name")
 print p
 p = hi.Person("name", 42)
@@ -147,13 +162,26 @@ print c
 c = hi.Couple(P2=hi.Person("p1", 42), P1=hi.Person("p2", 52))
 print c
 
-## FIXME(sbinet): this needs a Py<mytype>Check - ie: issue#16
-#try:
-#    hi.Couple(1)
-#    print "*ERROR* no exception raised!"
-#except Exception, err:
-#    print "caught:", err, "| err-type:",type(err)
-#    pass
+try:
+    hi.Couple(1)
+    print "*ERROR* no exception raised!"
+except Exception, err:
+    print "caught:", err, "| err-type:",type(err)
+    pass
+
+try:
+    hi.Couple(1,2)
+    print "*ERROR* no exception raised!"
+except Exception, err:
+    print "caught:", err, "| err-type:",type(err)
+    pass
+
+try:
+    hi.Couple(P2=1)
+    print "*ERROR* no exception raised!"
+except Exception, err:
+    print "caught:", err, "| err-type:",type(err)
+    pass
 
 ### test gc
 print "--- testing GC..."
diff --git a/main_test.go b/main_test.go
index 4a00aad..18a5c12 100644
--- a/main_test.go
+++ b/main_test.go
@@ -153,7 +153,9 @@ caught: can't work for 24 hours!
 --- p.Salary(2): 20
 --- p.Salary(24): caught: can't work for 24 hours!
 --- Person.__init__
-caught: expected string or Unicode object, int found | err-type: <type 'exceptions.TypeError'>
+caught: invalid type for 'Name' attribute | err-type: <type 'exceptions.TypeError'>
+caught: invalid type for 'Age' attribute | err-type: <type 'exceptions.TypeError'>
+caught: Person.__init__ takes at most 2 argument(s) | err-type: <type 'exceptions.TypeError'>
 hi.Person{Name="name", Age=0}
 hi.Person{Name="name", Age=42}
 hi.Person{Name="name", Age=42}
@@ -175,6 +177,9 @@ hi.Couple{P1=hi.Person{Name="p1", Age=42}, P2=hi.Person{Name="", Age=0}}
 hi.Couple{P1=hi.Person{Name="p1", Age=42}, P2=hi.Person{Name="p2", Age=52}}
 hi.Couple{P1=hi.Person{Name="p1", Age=42}, P2=hi.Person{Name="p2", Age=52}}
 hi.Couple{P1=hi.Person{Name="p2", Age=52}, P2=hi.Person{Name="p1", Age=42}}
+caught: invalid type for 'P1' attribute | err-type: <type 'exceptions.TypeError'>
+caught: invalid type for 'P1' attribute | err-type: <type 'exceptions.TypeError'>
+caught: invalid type for 'P2' attribute | err-type: <type 'exceptions.TypeError'>
 --- testing GC...
 --- len(objs): 100000
 --- len(vs): 100000