diff --git a/.travis.yml b/.travis.yml
index 5d3e838..0a327ed 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ python: "3.5"
 cache:
     directories:
         - $HOME/.cache/pip
+        - $HOME/mysql
 
 env:
     matrix:
@@ -23,6 +24,7 @@ matrix:
              - TOX_ENV=py27
              - EXTRAPKG=mariadb-test
           sudo: required
+
         - addons:
              mariadb: 10.0
           env:
@@ -30,34 +32,34 @@ matrix:
              - EXTRAPKG=mariadb-test
              - PAMCLEAR=1
           sudo: required
+
         - addons:
              mariadb: 10.1
           env:
              - TOX_ENV=py34
              - EXTRAPKG=mariadb-test
           sudo: required
+
         - env:
              - TOX_ENV=py34
-             - DB=5.6.28
+             - DB=5.6.32
           addons:
               apt:
                  packages:
                      - libaio-dev
           python: 3.3
-          cache:
-              directories:
-                  - ${HOME}/mysql
+
         - env:
              - TOX_ENV=py34
-             - DB=5.7.10
+             - DB=5.7.14
           addons:
               apt:
                  packages:
                      - libaio-dev
           python: 3.4
-          cache:
-              directories:
-                  - ${HOME}/mysql
+
+    allow_failures:
+        - env: DB=5.7.14
 
 # different py version from 5.6 and 5.7 as cache seems to be based on py version
 
diff --git a/pymysql/err.py b/pymysql/err.py
index d6bb0f6..70beb33 100644
--- a/pymysql/err.py
+++ b/pymysql/err.py
@@ -91,32 +91,12 @@ _map_error(OperationalError, ER.DBACCESS_DENIED_ERROR, ER.ACCESS_DENIED_ERROR,
            ER.CON_COUNT_ERROR, ER.TABLEACCESS_DENIED_ERROR,
            ER.COLUMNACCESS_DENIED_ERROR)
 
+
 del _map_error, ER
 
 
-def _get_error_info(data):
-    errno = struct.unpack('<h', data[1:3])[0]
-    is_41 = data[3:4] == b"#"
-    if is_41:
-        # version 4.1
-        sqlstate = data[4:9].decode("utf8", 'replace')
-        errorvalue = data[9:].decode("utf8", 'replace')
-        return (errno, sqlstate, errorvalue)
-    else:
-        # version 4.0
-        return (errno, None, data[3:].decode("utf8", 'replace'))
-
-
-def _check_mysql_exception(errinfo):
-    errno, sqlstate, errorvalue = errinfo
-    errorclass = error_map.get(errno, None)
-    if errorclass:
-        raise errorclass(errno, errorvalue)
-
-    # couldn't find the right error number
-    raise InternalError(errno, errorvalue)
-
-
 def raise_mysql_exception(data):
-    errinfo = _get_error_info(data)
-    _check_mysql_exception(errinfo)
+    errno = struct.unpack('<h', data[1:3])[0]
+    errval = data[4:].decode('utf-8', 'replace')
+    errorclass = error_map.get(errno, InternalError)
+    raise errorclass(errno, errval)
diff --git a/pymysql/tests/test_basic.py b/pymysql/tests/test_basic.py
index 67f1144..ed9c4f6 100644
--- a/pymysql/tests/test_basic.py
+++ b/pymysql/tests/test_basic.py
@@ -375,4 +375,5 @@ age = values(age)"""))
             cur.execute("drop table if exists no_exists_table")
         self.assertEqual(len(ws), 1)
         self.assertEqual(ws[0].category, pymysql.Warning)
-        self.assertTrue(u"no_exists_table" in str(ws[0].message))
+        if u"no_exists_table" not in str(ws[0].message):
+            self.fail("'no_exists_table' not in %s" % (str(ws[0].message),))
diff --git a/pymysql/tests/test_load_local.py b/pymysql/tests/test_load_local.py
index c091000..85fd94e 100644
--- a/pymysql/tests/test_load_local.py
+++ b/pymysql/tests/test_load_local.py
@@ -80,7 +80,9 @@ class TestLoadLocal(base.PyMySQLTestCase):
                      "test_load_local FIELDS TERMINATED BY ','").format(filename)
                 )
                 self.assertEqual(w[0].category, Warning)
-                self.assertTrue("Incorrect integer value" in str(w[-1].message))
+                expected_message = "Incorrect integer value"
+                if expected_message not in str(w[-1].message):
+                    self.fail("%r not in %r" % (expected_message, w[-1].message))
         finally:
             c.execute("DROP TABLE test_load_local")
             c.close()