Add WeChat OAuth2 APIs test cases

tests/fixtures/sns_oauth2_access_token.json

@@ -0,0 +1,7 @@
+{
+   "access_token":"ACCESS_TOKEN",
+   "expires_in":7200,
+   "refresh_token":"REFRESH_TOKEN",
+   "openid":"OPENID",
+   "scope":"SCOPE"
+}

tests/fixtures/sns_oauth2_auth.json

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+{
+    "errcode": 0,
+    "errmsg": "ok"
+}

tests/fixtures/sns_oauth2_refresh_token.json

@@ -0,0 +1,7 @@
+{
+   "access_token":"ACCESS_TOKEN",
+   "expires_in":7200,
+   "refresh_token":"REFRESH_TOKEN",
+   "openid":"OPENID",
+   "scope":"SCOPE"
+}

tests/fixtures/sns_userinfo.json

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+{
+   "openid": "OPENID",
+   "nickname": "NICKNAME",
+   "sex": "1",
+   "province": "PROVINCE",
+   "city": "CITY",
+   "country": "COUNTRY",
+    "headimgurl": "http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/46", 
+    "privilege": [
+        "PRIVILEGE1",
+        "PRIVILEGE2"
+    ],
+    "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
+}

tests/test_oauth.py

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+# -*- coding: utf-8 -*-
+from __future__ import absolute_import, unicode_literals, print_function
+import os
+import unittest
+
+from httmock import urlmatch, HTTMock, response
+
+from wechatpy import WeChatOAuth
+from wechatpy._compat import json
+
+
+_TESTS_PATH = os.path.abspath(os.path.dirname(__file__))
+_FIXTURE_PATH = os.path.join(_TESTS_PATH, 'fixtures')
+
+
+@urlmatch(netloc=r'(.*\.)?api\.weixin\.qq\.com$')
+def wechat_api_mock(url, request):
+    path = url.path[1:].replace('/', '_')
+    res_file = os.path.join(_FIXTURE_PATH, '%s.json' % path)
+    content = {
+        'errcode': 99999,
+        'errmsg': 'can not find fixture: %s' % res_file
+    }
+    headers = {
+        'Content-Type': 'application/json'
+    }
+    try:
+        with open(res_file) as f:
+            content = json.loads(f.read())
+    except (IOError, ValueError):
+        content['errmsg'] = 'Fixture %s json decode error' % res_file
+    return response(200, content, headers, request=request)
+
+
+class WeChatOAuthTestCase(unittest.TestCase):
+
+    app_id = '123456'
+    secret = '123456'
+    redirect_uri = 'http://localhost'
+
+    def setUp(self):
+        self.oauth = WeChatOAuth(
+            self.app_id,
+            self.secret,
+            self.redirect_uri
+        )
+
+    def test_get_authorize_url(self):
+        authorize_url = self.oauth.authorize_url
+        self.assertEqual(
+            'https://open.weixin.qq.com/connect/oauth2/authorize?appid=123456&redirect_uri=http%3A//localhost&response_type=code&scope=snsapi_base#wechat_redirect',  # NOQA
+            authorize_url
+        )
+
+    def test_fetch_access_token(self):
+        with HTTMock(wechat_api_mock):
+            res = self.oauth.fetch_access_token('123456')
+            self.assertEqual('ACCESS_TOKEN', res['access_token'])
+
+    def test_refresh_access_token(self):
+        with HTTMock(wechat_api_mock):
+            res = self.oauth.refresh_access_token('123456')
+            self.assertEqual('ACCESS_TOKEN', res['access_token'])
+
+    def test_get_user_info(self):
+        with HTTMock(wechat_api_mock):
+            self.oauth.fetch_access_token('123456')
+            res = self.oauth.get_user_info()
+            self.assertEqual('OPENID', res['openid'])
+
+    def test_check_access_token(self):
+        with HTTMock(wechat_api_mock):
+            self.oauth.fetch_access_token('123456')
+            res = self.oauth.check_access_token()
+            self.assertEqual(True, res)