Added tests.

setup.cfg

@@ -0,0 +1,7 @@
+[nosetests]
+nocapture = 1
+cover-package = sqlalchemy_pervasive
+cover-erase = 1
+cover-inclusive = 1
+cover-html = 1
+cover-html-dir = htmlcov

tests/test_base.py

@@ -0,0 +1,42 @@
+
+from unittest import TestCase
+from mock import Mock
+
+from sqlalchemy.exc import InvalidRequestError
+
+from sqlalchemy_pervasive import base
+
+
+class PervasiveCompilerTests(TestCase):
+
+    def compiler(self):
+        return base.PervasiveCompiler(dialect=Mock(paramstyle='named'), statement=Mock())
+
+    def test_get_select_precolumns(self):
+        compiler = self.compiler()
+
+        select = Mock(_distinct=None, _limit=None, _offset=None)
+        self.assertEqual(compiler.get_select_precolumns(select), '')
+
+        select._distinct = True
+        self.assertEqual(compiler.get_select_precolumns(select), 'DISTINCT ')
+
+        select._distinct = False
+        select._limit = 10
+        self.assertEqual(compiler.get_select_precolumns(select), 'TOP 10 ')
+
+        select._limit = None
+        select._offset = 10
+        self.assertRaises(InvalidRequestError, compiler.get_select_precolumns, select)
+
+    def test_limit_clause(self):
+        compiler = self.compiler()
+        self.assertEqual(compiler.limit_clause(Mock()), '')
+
+    def test_visit_true(self):
+        compiler = self.compiler()
+        self.assertEqual(compiler.visit_true(Mock()), '1')
+
+    def test_visit_false(self):
+        compiler = self.compiler()
+        self.assertEqual(compiler.visit_false(Mock()), '0')