[dts] [PATCH V1] tests/tx_preparation: optimize script

[Wenjie Li]

move stop/quit testpmd into tear_down; otherwise, if one case is failed,
the testpmd is still running, it will affect the following cases.

Signed-off-by: Wenjie Li <wenjiex.a.li at intel.com>
---
 tests/TestSuite_tx_preparation.py | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/tests/TestSuite_tx_preparation.py b/tests/TestSuite_tx_preparation.py
index eea95c1..ba0aac7 100644
--- a/tests/TestSuite_tx_preparation.py
+++ b/tests/TestSuite_tx_preparation.py
@@ -173,8 +173,6 @@ class TestTX_preparation(TestCase):
         self.dut_testpmd.execute_cmd('start')
 
         self.send_packet_verify()
-        self.dut_testpmd.execute_cmd('stop')
-        self.dut_testpmd.quit() 
  
     def test_tx_preparation_TSO(self):
         """
@@ -185,16 +183,13 @@ class TestTX_preparation(TestCase):
         self.dut_testpmd.execute_cmd('start')
 
         self.send_packet_verify(1)
-        self.dut_testpmd.execute_cmd('stop')
-        self.dut_testpmd.quit()
-
 
     def tear_down(self):
         """
         Run after each test case. 
-        """ 
-        pass
-
+        """
+        self.dut_testpmd.execute_cmd('stop')
+        self.dut_testpmd.quit()
         
     def tear_down_all(self):
         """
-- 
2.17.1