Added regression test for infinity parsing in dates

...and a couple of typos.

tests/test_dates.py

@@ -213,6 +213,14 @@ def test_parse_negative_interval(self):
         self.assertEqual(value.seconds, 41103)
         self.assertEqual(value.microseconds, 876544)
 
+    def test_parse_infinity(self):
+        value = self.DATETIME('-infinity', self.curs)
+        self.assertEqual(str(value), '0001-01-01 00:00:00')
+        value = self.DATETIME('infinity', self.curs)
+        self.assertEqual(str(value), '9999-12-31 23:59:59.999999')
+        value = self.DATE('infinity', self.curs)
+        self.assertEqual(str(value), '9999-12-31')
+
     def test_adapt_date(self):
         from datetime import date
         value = self.execute('select (%s)::date::text',
@@ -240,7 +248,7 @@ def test_adapt_timedelta(self):
         self.assertEqual(seconds, 3674096)
         self.assertEqual(int(round((value - seconds) * 1000000)), 123456)
 
-    def test_adapt_megative_timedelta(self):
+    def test_adapt_negative_timedelta(self):
         from datetime import timedelta
         value = self.execute('select extract(epoch from (%s)::interval)',
                              [timedelta(days=-42, seconds=45296,
@@ -428,7 +436,7 @@ def test_adapt_timedelta(self):
         self.assertEqual(seconds, 3674096)
         self.assertEqual(int(round((value - seconds) * 1000000)), 123456)
 
-    def test_adapt_megative_timedelta(self):
+    def test_adapt_negative_timedelta(self):
         from mx.DateTime import DateTimeDeltaFrom
         value = self.execute('select extract(epoch from (%s)::interval)',
                              [DateTimeDeltaFrom(days=-42,