addressing lint

opentelemetry-sdk/tests/trace/propagation/test_b3_format.py

@@ -17,8 +17,8 @@
 import opentelemetry.sdk.trace as trace
 import opentelemetry.sdk.trace.propagation.b3_format as b3_format
 import opentelemetry.trace as trace_api
-from opentelemetry.trace.propagation import set_span_in_context
 from opentelemetry.context import get_current
+from opentelemetry.trace.propagation import set_span_in_context
 
 FORMAT = b3_format.B3Format()
 
@@ -257,7 +257,8 @@ def test_missing_span_id(self):
         span_context = trace_api.get_current_span(ctx).get_context()
         self.assertEqual(span_context.span_id, trace_api.INVALID_SPAN_ID)
 
-    def test_inject_empty_context(self):
+    @staticmethod
+    def test_inject_empty_context():
         """If the current context has no span, don't add headers"""
         new_carrier = {}
         FORMAT.inject(dict.__setitem__, new_carrier, get_current())