* Renamed test_sync to test_sync_clk_basic

* Authored test for known issue in sync mode, test_sync_clk_plugin
* Removed some unrequired test related files

tests/test_sync_clk_plugin.py

@@ -0,0 +1,19 @@
+import pytest
+import Pyxsim
+from Pyxsim import testers
+import os
+import sys
+
+from test_sync_clk_basic import do_test
+
+@pytest.fixture()
+def test_file(request):
+    return str(request.node.fspath)
+
+def test_sync_clk_plugin(test_file, options, capfd):
+
+    #pytest.xfail("This is a known failure due to issue #275")
+
+    result = do_test(test_file, options, capfd)
+
+    assert result