test(pyargus): add better testing for parsing expressions

- Limit the size of the identifiers, and prevent ambiguity in the
identifiers.

pyargus/tests/test_expr.py

@@ -1,13 +1,13 @@
 import logging
 
-from hypothesis import given
+from hypothesis import HealthCheck, given, settings
 
 import argus
-
-from .utils.expr_gen import argus_expr
+from argus.test_utils.expr_gen import argus_expr
 
 
 @given(spec=argus_expr())
+@settings(suppress_health_check=[HealthCheck.too_slow])
 def test_correct_expr(spec: str) -> None:
     try:
         _ = argus.parse_expr(spec)