Skip SQL tests if tarantool version < 2.0.0

Problem: all SQL-related tests fail with the following error
if tarantool < 2.0.0 is used:

    tarantool.error.DatabaseError: (48, 'Unknown request type 11')

Tarantool supports SQL-related stuff only since the 2.0.0 version.
So this patch adds a special decorator that will skip the test if
tarantool version < 2.0.0 is used.

test/suites/lib/skip.py

@@ -0,0 +1,22 @@
+import functools
+import pkg_resources
+
+SQL_SUPPORT_TNT_VERSION = '2.0.0'
+
+
+def skip_or_run_sql_test(func):
+    @functools.wraps(func)
+    def wrapper(self, *args, **kwargs):
+        tnt_version = pkg_resources.parse_version(self.tnt_version)
+        sql_support_tnt_version = pkg_resources.parse_version(
+            SQL_SUPPORT_TNT_VERSION
+        )
+
+        if tnt_version < sql_support_tnt_version:
+            self.skipTest(
+                'Tarantool %s does not support SQL' % self.tnt_version
+            )
+        else:
+            func(self, *args, **kwargs)
+
+    return wrapper

test/suites/test_dbapi.py

@@ -10,6 +10,7 @@
 import tarantool
 from tarantool import dbapi
 from .lib.tarantool_server import TarantoolServer
+from .lib.skip import skip_or_run_sql_test
 
 
 class TestSuite_DBAPI(dbapi20.DatabaseAPI20Test):
@@ -33,6 +34,9 @@ def setUpClass(self):
         self.connect_kw_args = dict(
             host=self.srv.host,
             port=self.srv.args['primary'])
+        self.tnt_version = '.'.join(
+            self.srv.admin('box.info.version')[0].split('-')[0].split('.')[:3]
+        )
 
     def setUp(self):
         # prevent a remote tarantool from clean our session
@@ -50,6 +54,47 @@ def tearDownClass(self):
         self.srv.stop()
         self.srv.clean()
 
+    @skip_or_run_sql_test
+    def test_None(self):
+        super(TestSuite_DBAPI, self).test_None()
+
+    @skip_or_run_sql_test
+    def test_cursor_isolation(self):
+        super(TestSuite_DBAPI, self).test_cursor_isolation()
+
+    @skip_or_run_sql_test
+    def test_execute(self):
+        super(TestSuite_DBAPI, self).test_execute()
+
+    @skip_or_run_sql_test
+    def test_executemany(self):
+        super(TestSuite_DBAPI, self).test_executemany()
+
+    @skip_or_run_sql_test
+    def test_fetchall(self):
+        super(TestSuite_DBAPI, self).test_fetchall()
+
+    @skip_or_run_sql_test
+    def test_fetchmany(self):
+        super(TestSuite_DBAPI, self).test_fetchmany()
+
+    @skip_or_run_sql_test
+    def test_fetchone(self):
+        super(TestSuite_DBAPI, self).test_fetchone()
+
+    @skip_or_run_sql_test
+    def test_mixedfetch(self):
+        super(TestSuite_DBAPI, self).test_mixedfetch()
+
+    @skip_or_run_sql_test
+    def test_setinputsizes(self):
+        super(TestSuite_DBAPI, self).test_setinputsizes()
+
+    @skip_or_run_sql_test
+    def test_setoutputsize_basic(self):
+        super(TestSuite_DBAPI, self).test_setoutputsize_basic()
+
+    @skip_or_run_sql_test
     def test_rowcount(self):
         con = self._connect()
         try:

test/suites/test_execute.py

@@ -7,11 +7,12 @@
 
 import tarantool
 from .lib.tarantool_server import TarantoolServer
+from .lib.skip import skip_or_run_sql_test
 
 
 class TestSuite_Execute(unittest.TestCase):
     ddl = 'create table %s (id INTEGER PRIMARY KEY AUTOINCREMENT, ' \
-           'name varchar(20))'
+          'name varchar(20))'
 
     dml_params = [
         {'id': None, 'name': 'Michael'},
@@ -29,6 +30,9 @@ def setUpClass(self):
         self.srv.script = 'test/suites/box.lua'
         self.srv.start()
         self.con = tarantool.Connection(self.srv.host, self.srv.args['primary'])
+        self.tnt_version = '.'.join(
+            self.srv.admin('box.info.version')[0].split('-')[0].split('.')[:3]
+        )
 
     def setUp(self):
         # prevent a remote tarantool from clean our session
@@ -54,6 +58,7 @@ def _populate_data(self, table_name):
     def _create_table(self, table_name):
         return self.con.execute(self.ddl % table_name)
 
+    @skip_or_run_sql_test
     def test_dml_response(self):
         table_name = 'foo'
         response = self._create_table(table_name)
@@ -75,6 +80,7 @@ def test_dml_response(self):
         self.assertEqual(response.affected_row_count, 2)
         self.assertEqual(response.data, None)
 
+    @skip_or_run_sql_test
     def test_dql_response(self):
         table_name = 'bar'
         self._create_table(table_name)