Reset captured path params for each candidate route in local mode

.changes/next-release/179023577438815-bugfix-local-11715.json

@@ -0,0 +1,5 @@
+{
+  "type": "bugfix",
+  "category": "local",
+  "description": "Fix path parameters from a non matching route leaking into the matched route in local mode."
+}

chalice/local.py

@@ -139,10 +139,10 @@ def match_route(self, url: str) -> MatchResult:
         if path != '/' and path.endswith('/'):
             path = path[:-1]
         parts = path.split('/')
-        captured = {}
         for route_url in self.route_urls:
             url_parts = route_url.split('/')
             if len(parts) == len(url_parts):
+                captured = {}
                 for i, j in zip(parts, url_parts):
                     if j.startswith('{') and j.endswith('}'):
                         captured[j[1:-1]] = i

tests/unit/test_local.py

@@ -610,6 +610,11 @@ def test_can_match_exact_route(actual_url, matched_url):
             matcher.match_route(actual_url)
 
 
+def test_does_not_capture_params_from_unmatched_routes():
+    matcher = local.RouteMatcher(['/{x}/c', '/{y}/d'])
+    assert matcher.match_route('/foo/d').captured == {'y': 'foo'}
+
+
 def test_lambda_event_contains_source_ip():
     converter = local.LambdaEventConverter(
         local.RouteMatcher(['/foo/bar']))