Added support for display filter validation and tests for it

marine/marine.py

@@ -90,6 +90,10 @@ def validate_bpf(self, bpf: str) -> bool:
         bpf = bpf.encode("utf-8")
         return bool(self._marine.validate_bpf(bpf))
 
+    def validate_display_filter(self, display_filter: str) -> bool:
+        display_filter = display_filter.encode("utf-8")
+        return bool(self._marine.validate_display_filter(display_filter))
+
     @staticmethod
     def _parse_output(output: str) -> List[str]:
         # TODO: this is a bottleneck. Find a better way to provide output from the c code

tests/marine/test_marine.py

@@ -396,3 +396,11 @@ def test_validate_bpf_success(marine_instance: Marine):
 
 def test_validate_bpf_failure(marine_instance: Marine):
     assert not marine_instance.validate_bpf("what is this bpf?")
+
+
+def test_validate_display_filter_success(marine_instance: Marine):
+    assert marine_instance.validate_display_filter("tcp")
+
+
+def test_validate_display_filter_failure(marine_instance: Marine):
+    assert not marine_instance.validate_display_filter("illegal_filter")