=== modified file 'test/unittest_db.py'
--- test/unittest_db.py	
+++ test/unittest_db.py	
@@ -92,9 +92,12 @@
 
     def test_connection_wrap(self):
         """Tests the connection wrapping"""
-        cnx = get_connection('postgres',
-                             self.host, self.db, self.user, self.passwd,
-                             quiet=1)
+        try:
+            cnx = get_connection('postgres',
+                                 self.host, self.db, self.user, self.passwd,
+                                 quiet=1)
+        except ImportError:
+            self.skip('postgresql dbapi module not installed')
         self.failIf(isinstance(cnx, PyConnection),
                     'cnx should *not* be a PyConnection instance')
         cnx = get_connection('postgres',
@@ -106,9 +109,12 @@
 
     def test_cursor_wrap(self):
         """Tests cursor wrapping"""
-        cnx = get_connection('postgres',
-                             self.host, self.db, self.user, self.passwd,
-                             quiet=1, pywrap = True)
+        try:
+            cnx = get_connection('postgres',
+                                 self.host, self.db, self.user, self.passwd,
+                                 quiet=1, pywrap = True)
+        except ImportError:
+            self.skip('postgresql dbapi module not installed')
         cursor = cnx.cursor()
         self.failUnless(isinstance(cursor, PyCursor),
                         'cnx should be a PyCursor instance')
@@ -134,8 +140,11 @@
         
     def test_pgdb_types(self):
         """Tests that NUMBER really wraps all number types"""
-        set_prefered_driver('postgres', 'pgdb')        
-        module = get_dbapi_compliant_module('postgres')
+        set_prefered_driver('postgres', 'pgdb')
+        try:
+            module = get_dbapi_compliant_module('postgres')
+        except ImportError:
+            self.skip('python-pqsql is not installed')
         number_types = 'int2', 'int4', 'serial', \
                        'int8', 'float4', 'float8', \
                        'numeric', 'bool', 'money'
@@ -146,16 +155,25 @@
     def test_pypgsql_getattr(self):
         """Tests the getattr() delegation for pyPgSQL"""
         set_prefered_driver('postgres', 'pyPgSQL.PgSQL')
-        module = get_dbapi_compliant_module('postgres')
+        try:
+            module = get_dbapi_compliant_module('postgres')
+        except ImportError:
+            self.skip('python-pygresql is not installed')
         try:
             binary = module.BINARY
         except AttributeError, err:
             self.fail(str(err))        
 
     def test_adv_func_helper(self):
-        module = get_dbapi_compliant_module('postgres')
+        try:
+            module = get_dbapi_compliant_module('postgres')
+        except ImportError:
+            self.skip('postgres dbapi module is not installed')
         self.failUnless(isinstance(module.adv_func_helper, _PGAdvFuncHelper))
-        module = get_dbapi_compliant_module('sqlite')
+        try:
+            module = get_dbapi_compliant_module('sqlite')
+        except ImportError:
+            self.skip('pysqlite is not installed')
         self.failUnless(isinstance(module.adv_func_helper, _GenericAdvFuncHelper))