Added conftest.py (demisto#17795)

Tests/scripts/dev_envs/pytest/conftest.py

@@ -0,0 +1,52 @@
+import pytest
+import logging
+
+
+# File is copied to each package dir when running tests.
+# More info about conftest.py at:
+#   https://docs.pytest.org/en/latest/writing_plugins.html#conftest-py-plugins  # disable-secrets-detection
+
+
+@pytest.fixture(autouse=True)
+def check_logging(caplog):
+    '''
+    Fixture validates that the python logger doesn't contain any warnings (or up) messages
+
+    If your test fails and it is ok to have such messages then you can clear the log at the end of your test
+    By callign: caplog.clear()
+
+    For example:
+
+    def test_foo(caplog):
+        logging.getLogger().warning('this is ok')
+        caplog.clear()
+    '''
+    yield
+    messages = [
+        "{}: {}".format(x.levelname, x.message) for x in caplog.get_records('call') if x.levelno >= logging.WARNING
+    ]
+    if messages:
+        pytest.fail(
+            "warning messages encountered during testing: {}".format(messages)
+        )
+
+
+@pytest.fixture(autouse=True)
+def check_std_out_err(capfd):
+    '''
+    Fixture validates that there is no output to stdout or stderr.
+
+    If your test fails and it is ok to have output in stdout/stderr, you can disable the capture use "with capfd.disabled()"
+
+    For example:
+
+    def test_boo(capfd):
+        with capfd.disabled():
+            print("this is ok")
+    '''
+    yield
+    (out, err) = capfd.readouterr()
+    if out:
+        pytest.fail("Found output in stdout: [{}]".format(out.strip()))
+    if err:
+        pytest.fail("Found output in stderr: [{}]".format(err.strip()))