Switch to from_parent to remove deprecation warning.

Signed-off-by: Chris Lalancette <[email protected]>

Author: clalancette

launch_testing/launch_testing/pytest/hooks.py

@@ -123,6 +123,19 @@ def reportinfo(self):
 
 class LaunchTestModule(pytest.File):
 
+    def __init__(self, parent, *, fspath):
+        super().__init__(parent=parent, fspath=fspath)
+
+    @classmethod
+    def from_parent(cls, parent, *, fspath):
+        """Override from_parent for compatibility."""
+        # pytest.File.from_parent didn't exist before pytest 5.4
+        if hasattr(super(), 'from_parent'):
+            instance = getattr(super(), 'from_parent')(parent=parent, fspath=fspath)
+        else:
+            instance = cls(parent=parent, fspath=fspath)
+        return instance
+
     def makeitem(self, *args, **kwargs):
         return LaunchTestItem.from_parent(*args, **kwargs)
 
@@ -171,7 +184,7 @@ def pytest_pycollect_makemodule(path, parent):
 def pytest_launch_collect_makemodule(path, parent, entrypoint):
     marks = getattr(entrypoint, 'pytestmark', [])
     if marks and any(m.name == 'launch_test' for m in marks):
-        return LaunchTestModule(path, parent)
+        return LaunchTestModule.from_parent(parent, fspath=path)
 
 
 def pytest_addhooks(pluginmanager):