[Buildroot] [git commit] support/testing: remove hardcoded sleep from python-flask test

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=cbe0f4de67aef0f4695073c2047ba65cc420c83a
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Similar to the new fastapi test, instead of waiting for a hard coded
amount of time we can retry every second until the server is available
and abort if after the timeout we still didn't manage to connect.

Signed-off-by: Marcus Hoffmann <buildroot at bubu1.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
 support/testing/tests/package/test_python_flask.py | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/support/testing/tests/package/test_python_flask.py b/support/testing/tests/package/test_python_flask.py
index 9d8587e918..32d9da34a5 100644
--- a/support/testing/tests/package/test_python_flask.py
+++ b/support/testing/tests/package/test_python_flask.py
@@ -21,9 +21,13 @@ class TestPythonPy3Flask(TestPythonPackageBase):
         _, exit_code = self.emulator.run(cmd, timeout=self.timeout)
 
         # Give enough time for the flask server to start up
-        time.sleep(30)
+        for attempt in range(30):
+            time.sleep(1)
 
-        cmd = "wget -q -O - http://127.0.0.1:5000/"
-        output, exit_code = self.emulator.run(cmd, timeout=self.timeout)
-        self.assertEqual(exit_code, 0)
-        self.assertEqual(output[0], "Hello, World!")
+            cmd = "wget -q -O - http://127.0.0.1:5000/"
+            output, exit_code = self.emulator.run(cmd, timeout=self.timeout)
+            if exit_code == 0:
+                self.assertEqual(output[0], 'Hello, World!')
+                break
+        else:
+            self.assertTrue(False, "Timeout while waiting for flask server")