diff --git a/tests/core/pyspec/eth2spec/test/eip7594/unittests/test_config_invariants.py b/tests/core/pyspec/eth2spec/test/eip7594/unittests/test_config_invariants.py
new file mode 100644
index 000000000..20baca8bf
--- /dev/null
+++ b/tests/core/pyspec/eth2spec/test/eip7594/unittests/test_config_invariants.py
@@ -0,0 +1,12 @@
+from eth2spec.test.context import (
+    single_phase,
+    spec_test,
+    with_eip7594_and_later,
+)
+
+
+@with_eip7594_and_later
+@spec_test
+@single_phase
+def test_polynomical_commitments_sampling(spec):
+    assert spec.FIELD_ELEMENTS_PER_EXT_BLOB == 2 * spec.FIELD_ELEMENTS_PER_BLOB