Adding the test cases

coverage_result.json

@@ -0,0 +1,11 @@
+{
+    "get_send_file_max_age_1": true,
+    "get_send_file_max_age_2": true,
+    "get_send_file_max_age_3": true,
+    "dispatch_request_1": true,
+    "dispatch_request_2": true,
+    "dispatch_request_3": true,
+    "dispatch_request_success": true,
+    "dispatch_request_error": true,
+    "dispatch_request_not_found": true
+}

src/flask/__init__.py

@@ -41,7 +41,7 @@ from .templating import stream_template as stream_template
 from .templating import stream_template_string as stream_template_string
 from .wrappers import Request as Request
 from .wrappers import Response as Response
-
+from .coverage_tracker import track_coverage, branch_coverage
 
 def __getattr__(name: str) -> t.Any:
     if name == "__version__":

src/flask/app.py

@@ -10,6 +10,7 @@ from inspect import iscoroutinefunction
 from itertools import chain
 from types import TracebackType
 from urllib.parse import quote as _url_quote
+from .coverage_tracker import track_coverage, branch_coverage
 
 import click
 from werkzeug.datastructures import Headers
@@ -289,13 +290,14 @@ class Flask(App):
         .. versionadded:: 0.9
         """
         value = current_app.config["SEND_FILE_MAX_AGE_DEFAULT"]
-
         if value is None:
+            track_coverage("get_send_file_max_age_1")
             return None
-
+        
         if isinstance(value, timedelta):
+            track_coverage("get_send_file_max_age_2")
             return int(value.total_seconds())
-
+        track_coverage("get_send_file_max_age_3")
         return value  # type: ignore[no-any-return]
 
     def send_static_file(self, filename: str) -> Response:
@@ -852,6 +854,7 @@ class Flask(App):
         """
         req = request_ctx.request
         if req.routing_exception is not None:
+            track_coverage("dispatch_request_1")
             self.raise_routing_exception(req)
         rule: Rule = req.url_rule  # type: ignore[assignment]
         # if we provide automatic options for this URL and the
@@ -860,11 +863,14 @@ class Flask(App):
             getattr(rule, "provide_automatic_options", False)
             and req.method == "OPTIONS"
         ):
+            track_coverage("dispatch_request_2")
             return self.make_default_options_response()
         # otherwise dispatch to the handler for that endpoint
         view_args: dict[str, t.Any] = req.view_args  # type: ignore[assignment]
+        track_coverage("dispatch_request_3")
         return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
 
+
     def full_dispatch_request(self) -> Response:
         """Dispatches the request and on top of that performs request
         pre and postprocessing as well as HTTP exception catching and

src/flask/coverage_tracker.py

@@ -0,0 +1,12 @@
+branch_coverage = {
+    "get_send_file_max_age_1": False, 
+    "get_send_file_max_age_2": False,
+    "get_send_file_max_age_3": False, 
+    "dispatch_request_1": False,
+    "dispatch_request_2": False,
+    "dispatch_request_3": False,
+}
+
+def track_coverage(branch_name):
+    global branch_coverage
+    branch_coverage[branch_name] = True

tests/test_dispatch_request.py

@@ -0,0 +1,64 @@
+import pytest
+from flask import Flask, json
+from werkzeug.exceptions import HTTPException, NotFound, InternalServerError
+from unittest.mock import patch
+
+# Import the module where branch_coverage and track_coverage are defined
+from flask import branch_coverage, track_coverage
+
+def create_app():
+    app = Flask(__name__)
+
+    @app.route('/success')
+    def success():
+        track_coverage('dispatch_request_success')
+        return 'Success', 200
+
+    @app.route('/error')
+    def error():
+        track_coverage('dispatch_request_error')
+        raise InternalServerError(description='Error occurred')
+
+    @app.route('/not_found')
+    def not_found():
+        track_coverage('dispatch_request_not_found')
+        raise NotFound(description='This is a 404')
+
+    return app
+
+@pytest.fixture
+def client():
+    app = create_app()
+    app.config['TESTING'] = True
+    with app.test_client() as client:
+        yield client
+
+def test_success_path(client):
+    response = client.get('/success')
+    assert response.status_code == 200
+    assert response.data == b'Success'
+    assert branch_coverage['dispatch_request_success']
+
+def test_error_handling(client):
+    response = client.get('/error')
+    assert response.status_code == 500
+    assert 'Error occurred' in response.get_data(as_text=True)
+    assert branch_coverage['dispatch_request_error']
+
+def test_not_found_handling(client):
+    response = client.get('/not_found')
+    assert response.status_code == 404
+    assert 'This is a 404' in response.get_data(as_text=True)
+    assert branch_coverage['dispatch_request_not_found']
+
+def test_no_route(client):
+    response = client.get('/no_route')
+    assert response.status_code == 404
+    # Revised or removed based on actual coverage tracking setup
+    # assert branch_coverage.get('dispatch_request_no_route_found', False)
+
+# Test to save branch coverage data into a JSON file after all tests
+def test_save_branch_coverage():
+    file_path = '/Users/jannesvandenbogert/Documents/GitHub/flask/coverage_result.json'
+    with open(file_path, 'w') as json_file:
+        json.dump(branch_coverage, json_file, indent=4)

tests/test_get_send_file_max_age.py

@@ -0,0 +1,43 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from datetime import timedelta
+from flask import Flask, current_app
+from flask.app import Flask as FlaskApp
+from flask import branch_coverage, track_coverage
+import json
+
+def save_coverage_to_json(file_path='/Users/jannesvandenbogert/Documents/GitHub/flask/coverage_result.json'):
+    with open(file_path, 'w') as json_file:
+        json.dump(branch_coverage, json_file, indent=4)
+
+def create_test_app(config):
+    app = Flask(__name__)
+    app.config.update(config)
+    return app
+
+def test_get_send_file_max_age_none():
+    app = create_test_app({"SEND_FILE_MAX_AGE_DEFAULT": None})
+    with app.app_context():
+        max_age = app.get_send_file_max_age("test.txt")
+        assert max_age is None
+        assert branch_coverage["get_send_file_max_age_1"] == True
+
+def test_get_send_file_max_age_timedelta():
+    app = create_test_app({"SEND_FILE_MAX_AGE_DEFAULT": timedelta(hours=1)})
+    with app.app_context():
+        max_age = app.get_send_file_max_age("test.txt")
+        assert max_age == 3600
+        assert branch_coverage["get_send_file_max_age_2"] == True
+
+def test_get_send_file_max_age_int():
+    app = create_test_app({"SEND_FILE_MAX_AGE_DEFAULT": 3600})
+    with app.app_context():
+        max_age = app.get_send_file_max_age("test.txt")
+        assert max_age == 3600
+        assert branch_coverage["get_send_file_max_age_3"] == True
+
+def test_branch_coverage():
+    save_coverage_to_json()
+    assert branch_coverage["get_send_file_max_age_1"] == True
+    assert branch_coverage["get_send_file_max_age_2"] == True
+    assert branch_coverage["get_send_file_max_age_3"] == True