Make the test.errors.count value explicit, update tests which had an implicit count

tests.py

@@ -58,12 +58,9 @@ class YAMLTest(unittest.TestCase):
 
         v = Validator(schema=self.yaml_schema)
         rv, msgs = v.validate(cfg)
-        count = None
-        try:
+        count = 0
+        if 'test' in unittest and 'errors' in unittest['test'] and 'count' in unittest['test']['errors']:
             count = unittest['test']['errors']['count']
-        except:
-            pass
-        if isinstance(count, int):
         assert len(msgs) == count, "%s: Expected %d error messages, got %d" % (self.yaml_filename, count, len(msgs))
 
         msgs_unexpected = 0

unittest/yaml/error-interface-mtu1.yaml

@@ -4,6 +4,7 @@ test:
     expected: 
      - "mtu.*less than 128"
      - "mtu.*greater than 9216"
+    count: 2
 ---
 interfaces:
   GigabitEthernet1/0/0:

unittest/yaml/error-interface-mtu2.yaml

@@ -3,6 +3,7 @@ test:
   errors:
     expected: 
      - "sub-interface .* has MTU 9001 higher than parent MTU 9000"
+    count: 1
 ---
 interfaces:
   GigabitEthernet1/0/0:

unittest/yaml/error-subinterface1.yaml

@@ -4,6 +4,7 @@ test:
     expected:
      - "100 .* unique encapsulation"
      - "101 .* unique encapsulation"
+    count: 2
 ---
 interfaces:
   GigabitEthernet1/0/0:

unittest/yaml/error-subinterface2.yaml

@@ -3,6 +3,7 @@ test:
   errors:
     expected:
      - "sub-interface .* has LCP but .* does not have LCP"
+    count: 1
 ---
 interfaces:
   GigabitEthernet1/0/0:

unittest/yaml/error-subinterface4.yaml

@@ -3,6 +3,7 @@ test:
   errors:
     expected:
      - "sub-interface .* has LCP with too long name"
+    count: 1
 ---
 interfaces:
   GigabitEthernet1/0/0:

unittest/yaml/error-subinterface5.yaml

@@ -3,6 +3,7 @@ test:
   errors:
     expected:
      - "sub-interface .* has an address but .* does not have LCP"
+    count: 1
 ---
 interfaces:
   GigabitEthernet1/0/0:

unittest/yaml/error-subinterface7.yaml

@@ -3,6 +3,7 @@ test:
   errors:
     expected:
      - "sub-interface .* has no config"
+    count: 1
 ---
 interfaces:
   GigabitEthernet1/0/0: