tests: Try overriding local file with SCP

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Co-authored-by: Sviatoslav Sydorenko (Святослав Сидоренко) <wk.cvs.github@sydorenko.org.ua>

Author: Jakuje

tests/unit/scp_test.py

@@ -75,3 +75,17 @@ def test_copy_from_non_existent_remote_path(path_to_non_existent_src_file, ssh_s
     error_msg = '^Error receiving information about file:'
     with pytest.raises(LibsshSCPException, match=error_msg):
         ssh_scp.get(str(path_to_non_existent_src_file), os.devnull)
+
+
+@pytest.fixture
+def pre_existing_file_path(tmp_path):
+    """Return local path for a pre-populated file."""
+    path = tmp_path / 'pre-existing-file.txt'
+    path.write_bytes(b'whatever')
+    return path
+
+
+def test_get_existing_local(pre_existing_file_path, src_path, ssh_scp, transmit_payload):
+    """Check that SCP file download works and overwrites local file if it exists."""
+    ssh_scp.get(str(src_path), str(pre_existing_file_path))
+    assert pre_existing_file_path.read_bytes() == transmit_payload