tests: update sbfd test cases for code review comments

Signed-off-by: wumu.zsl <wumu.zsl@alibaba-inc.com>

tests/topotests/sbfd_topo1/test_sbfd_topo1.py

@@ -63,17 +63,26 @@ def show_bfd_check(router, status, type='echo', encap=None):
         # check encap data if any
         pattern1 = re.compile(r'encap-data {}'.format(encap))
         ret = pattern1.findall(output)
-        assert len(ret) > 0, output
+        if len(ret) <= 0:
+            logger.info("encap-data not match")
+            return False
 
     # check  status
     pattern2 = re.compile(r'Status: {}'.format(status))
     ret = pattern2.findall(output)
-    assert len(ret) > 0, output
+    if len(ret) <= 0:
+        logger.info("Status not match")
+        return False
 
     # check type
     pattern3 = re.compile(r'Peer Type: {}'.format(type))
     ret = pattern3.findall(output)
-    assert len(ret) > 0, output
+    if len(ret) <= 0:
+        logger.info("Peer Type not match")
+        return False
+
+    logger.info("all check passed")
+    return True
 
 def build_topo(tgen):
     "Test topology builder"
@@ -141,15 +150,16 @@ def test_sbfd_config_check():
     # config sbfd
     r1 = tgen.net['r1']
     r1.cmd("ping -c 5 2001::20")
-    time.sleep(5)
     r1.cmd("vtysh -c 'config t' -c 'bfd' -c 'peer 2001::20 bfd-mode sbfd-init bfd-name 2-44 local-address 2001::10 remote-discr 1234'")
 
     r2 = tgen.net['r2']
     r2.cmd("vtysh -c 'config t' -c 'bfd' -c 'sbfd reflector source-address 2001::20 discriminator 1234'")
 
-    logger.info('waiting 5 sec ... for sbfd up')
-    time.sleep(5)
-    show_bfd_check(r1, 'up', type='sbfd initiator')
+    check_func = partial(
+        show_bfd_check, r1, 'up', type='sbfd initiator'
+    )
+    success, _ = topotest.run_and_expect(check_func, True, count=15, wait=1)
+    assert success is True, "sbfd not up in 15 seconds"
 
 # step 2: shutdown if and no shutdown if then check sbfd status
 def test_sbfd_updown_interface():
@@ -163,14 +173,20 @@ def test_sbfd_updown_interface():
 
     # shutdown interface
     r2.cmd("vtysh -c 'config t' -c 'interface r2-eth0' -c 'shutdown'")
-    time.sleep(5)
-    show_bfd_check(r1, 'down', type='sbfd initiator')
+
+    check_func = partial(
+        show_bfd_check, r1, 'down', type='sbfd initiator'
+    )
+    success, _ = topotest.run_and_expect(check_func, True, count=15, wait=1)
+    assert success is True, "sbfd not down in 15 seconds after shut"
 
     # up interface
     r2.cmd("vtysh -c 'config t' -c 'interface r2-eth0' -c 'no shutdown'")
-    logger.info('waiting 5 sec ... for sbfd up after no shutdown')
-    time.sleep(5)
-    show_bfd_check(r1, 'up', type='sbfd initiator')
+    check_func = partial(
+        show_bfd_check, r1, 'up', type='sbfd initiator'
+    )
+    success, _ = topotest.run_and_expect(check_func, True, count=15, wait=1)
+    assert success is True, "sbfd not up in 15 seconds after no shut"
 
 # step 3: change transmit-interval and check sbfd status according to the interval time
 def test_sbfd_change_transmit_interval():
@@ -184,23 +200,28 @@ def test_sbfd_change_transmit_interval():
 
     r1.cmd("vtysh -c 'config t' -c 'bfd' -c 'peer 2001::20 bfd-mode sbfd-init bfd-name 2-44 local-address 2001::10 remote-discr 1234' -c 'transmit-interval 3000'")
     #wait sometime for polling finish
-    time.sleep(3)
+    time.sleep(1)
 
     # shutdown interface
     r2.cmd("vtysh -c 'config t' -c 'interface r2-eth0' -c 'shutdown'")
-    logger.info('waiting 5 sec ... for sbfd still up after shutdown')
-    time.sleep(5)
-    #sbfd is still up
-    show_bfd_check(r1, 'up', type='sbfd initiator')
+
     #wait enough time for timeout
-    logger.info('waiting 10 sec ... for sbfd down after shutdown')
-    time.sleep(10)
-    show_bfd_check(r1, 'down', type='sbfd initiator')
+    check_func = partial(
+        show_bfd_check, r1, 'down', type='sbfd initiator'
+    )
+    success, _ = topotest.run_and_expect(check_func, True, count=5, wait=3)
+    assert success is True, "sbfd not down as expected"
 
     r2.cmd("vtysh -c 'config t' -c 'interface r2-eth0' -c 'no shutdown'")
-    logger.info('waiting 5 sec ... for sbfd up after no shutdown')
-    time.sleep(5)
-    show_bfd_check(r1, 'up', type='sbfd initiator')
+    check_func = partial(
+        show_bfd_check, r1, 'up', type='sbfd initiator'
+    )
+    success, _ = topotest.run_and_expect(check_func, True, count=15, wait=1)
+    assert success is True, "sbfd not up in 15 seconds after no shut"
+
+    r1.cmd("vtysh -c 'config t' -c 'bfd' -c 'no peer 2001::20 bfd-mode sbfd-init bfd-name 2-44 local-address 2001::10 remote-discr 1234'")
+    success = show_bfd_check(r1, 'up', type='sbfd initiator')
+    assert success is False, "sbfd not deleted as unexpected"
 
 # Memory leak test template
 def test_memory_leak():