Added conftest.py for pytest

File contains a fixture which must be present for test_logger module to
work functionally. Fixture relates to a monkeypatch implementation for
capturing standard PIPEs and storing their results in a buffer. This
buffer can then be read after a call to send data on a PIPE stream has
been called, via a key lookup on the appropriate stream.

conftest.py

@@ -0,0 +1,23 @@
+# flake8: noqa
+import sys
+
+import pytest
+
+
+@pytest.fixture
+def capture_stdpipe(monkeypatch):
+    stream_buf = {"stdout": "", "stderr": "", "writes": 0}
+
+    def mimic_stdout(chars):
+        stream_buf['stdout'] += chars
+        stream_buf['writes'] += 1
+    
+    def mimic_stderr(chars):
+        stream_buf['stderr'] += chars
+        stream_buf['writes'] += 1
+
+
+    monkeypatch.setattr(sys.stdout, 'write', mimic_stdout)
+    monkeypatch.setattr(sys.stderr, 'write', mimic_stderr)
+    
+    return stream_buf