Add test for auto reloading.

tests/test_auto_reload.py

@@ -0,0 +1,85 @@
+import os
+import sys
+import subprocess
+import signal
+from threading import Thread
+import requests
+from time import sleep
+
+sanic_project_content_one  = '''
+from sanic import Sanic
+from sanic import response
+
+app = Sanic(__name__)
+
+
+@app.route("/")
+async def test(request):
+    return response.json({"test": 1})
+
+
+if __name__ == '__main__':
+    app.run(host="127.0.0.1", port=8000, auto_reload=True)
+'''
+
+sanic_project_content_two  = '''
+from sanic import Sanic
+from sanic import response
+
+app = Sanic(__name__)
+
+
+@app.route("/")
+async def test(request):
+    return response.json({"test": 2})
+
+
+if __name__ == '__main__':
+    app.run(host="127.0.0.1", port=8000, auto_reload=True)
+'''
+
+process_id = None
+def execute_cmd(command):
+    process = subprocess.Popen(command, shell=True)
+    global process_id
+    process_id = process.pid
+    process.communicate()
+
+
+class TestAutoReloading:
+
+    def test_reloading_after_change_file(self,capsys):
+        if os.name != 'posix':
+            return
+
+        with capsys.disabled(): pass
+        sanic_app_file_path = "simple_sanic_app.py"
+        with open (sanic_app_file_path, "w") as _file:
+            _file.write(sanic_project_content_one)
+
+        cmd = ' '.join([sys.executable, sanic_app_file_path])
+        thread = Thread(target=execute_cmd, args=(cmd,))
+        thread.start()
+
+        sleep(2) # wait for completing server start process
+        response = requests.get("http://127.0.0.1:8000/").json()
+        assert response == {"test": 1}
+
+        with open (sanic_app_file_path, "w") as _file:
+            _file.write(sanic_project_content_two)
+        sleep(2) # wait for completing server start process
+        response = requests.get("http://127.0.0.1:8000/").json()
+        assert response == {"test": 2}
+
+        thread.join(1)
+        os.remove(sanic_app_file_path)
+
+    def teardown_method(self, method):
+            if process_id:
+                root_proc_path = "/proc/%s/task/%s/children" % (process_id, process_id)
+                if not os.path.isfile(root_proc_path):
+                    return
+                with open(root_proc_path) as children_list_file:
+                    children_list_pid = children_list_file.read().split()
+                for child_pid in children_list_pid:
+                    os.kill(int(child_pid), signal.SIGTERM)