Add cache method test

tests/test_cache.py

+# -*- coding: utf-8 -*-
+import unittest
+
+import pygeoip
+from pygeoip import MEMORY_CACHE, MMAP_CACHE, STANDARD
+from tests.config import COUNTRY_DB_PATH
+
+class TestGeoIPCacheMethods(unittest.TestCase):
+    def setUp(self):
+        self.us_hostname = 'google.com'
+        self.us_ip = '64.233.161.99'
+        self.us_code = 'US'
+        self.us_name = 'United States'
+
+        self.gi_mmap = pygeoip.GeoIP(COUNTRY_DB_PATH, MMAP_CACHE)
+        self.gi_memory = pygeoip.GeoIP(COUNTRY_DB_PATH, MEMORY_CACHE)
+        self.gi_standard = pygeoip.GeoIP(COUNTRY_DB_PATH, STANDARD)
+
+    def testCountryCodeByAddr(self):
+        code_mmap = self.gi_mmap.country_code_by_addr(self.us_ip)
+        code_memory = self.gi_memory.country_code_by_addr(self.us_ip)
+        code_standard = self.gi_standard.country_code_by_addr(self.us_ip)
+
+        self.assertEqual(code_mmap, self.us_code)
+        self.assertEqual(code_memory, self.us_code)
+        self.assertEqual(code_standard, self.us_code)