Update NumberConverter regex to match new Werkzeug behavior (v2) (#1643)

Fixes #1635

See https://github.com/pallets/werkzeug/issues/2518. 
Apparently, this is only an issue when you have more than 1 path
parameter, so added a test for that.

.github/workflows/pipeline.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}

connexion/apps/flask_app.py

@@ -172,7 +172,7 @@ class FlaskJSONEncoder(json.JSONEncoder):
 
 class NumberConverter(werkzeug.routing.BaseConverter):
     """ Flask converter for OpenAPI number type """
-    regex = r"[+-]?[0-9]*(\.[0-9]*)?"
+    regex = r"[+-]?[0-9]*(?:\.[0-9]*)?"
 
     def to_python(self, value):
         return float(value)

tests/api/test_parameters.py

@@ -175,6 +175,16 @@ def test_path_parameter_somefloat(simple_app, arg, result):
     assert resp.data.decode('utf-8', 'replace') == f'"{result}"\n'
 
 
+@pytest.mark.parametrize('arg, arg2, result', [
+    ['-0.000000001', '0.3', 'float -1e-09, 0.3'],
+])
+def test_path_parameter_doublefloat(simple_app, arg, arg2, result):
+    assert isinstance(arg, str)  # sanity check
+    app_client = simple_app.app.test_client()
+    resp = app_client.get(f'/v1.0/test-float-path/{arg}/{arg2}')  # type: flask.Response
+    assert resp.data.decode('utf-8', 'replace') == f'"{result}"\n'
+
+
 def test_path_parameter_somefloat__bad(simple_app):
     # non-float values will not match Flask route
     app_client = simple_app.app.test_client()

tests/fakeapi/hello/__init__.py

@@ -274,6 +274,10 @@ def test_get_somefloat(somefloat):
     return f'{type(somefloat).__name__} {somefloat:g}'
 
 
+def test_get_doublefloat(somefloat, someotherfloat):
+    return f'{type(somefloat).__name__} {somefloat:g}, {someotherfloat}'
+
+
 def test_default_param(name):
     return {"app_name": name}
 

tests/fixtures/simple/openapi.yaml

@@ -528,6 +528,24 @@ paths:
       responses:
         '200':
           description: OK
+  '/test-float-path/{somefloat}/{someotherfloat}':
+    get:
+      summary: Test type casting of path parameter
+      operationId: fakeapi.hello.test_get_doublefloat
+      parameters:
+        - name: somefloat
+          in: path
+          required: true
+          schema:
+            type: number
+        - name: someotherfloat
+          in: path
+          required: true
+          schema:
+            type: number
+      responses:
+        '200':
+          description: OK
   /test-default-query-parameter:
     get:
       summary: Test if default parameter is passed to function

tests/fixtures/simple/swagger.yaml

@@ -394,6 +394,23 @@ paths:
         200:
           description: OK
 
+  /test-float-path/{somefloat}/{someotherfloat}:
+    get:
+      summary: Test type casting of path parameter
+      operationId: fakeapi.hello.test_get_doublefloat
+      parameters:
+        - name: somefloat
+          in: path
+          type: number
+          required: true
+        - name: someotherfloat
+          in: path
+          type: number
+          required: true
+      responses:
+        200:
+          description: O
+
   /test-default-query-parameter:
     get:
       summary: Test if default parameter is passed to function

tox.ini

@@ -5,7 +5,6 @@ rst-roles=class
 
 [tox]
 envlist =
-    {py36}-{min,pypi,dev}
     {py37}-{min,pypi,dev}
     {py38}-{min,pypi,dev}
     {py39}-{min,pypi,dev}
@@ -17,7 +16,6 @@ envlist =
 
 [gh-actions]
 python =
-    3.6: py36-min,py36-pypi
     3.7: py37-min,py37-pypi
     3.8: py38-min,py38-pypi
     3.9: py39-min,py39-pypi,flake8,isort-check,isort-check-examples,isort-check-tests,mypy