diff --git a/tests/fixtures/competency/dependency-edit-invalidation/SCENARIO.md b/tests/fixtures/competency/dependency-edit-invalidation/SCENARIO.md
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+++ b/tests/fixtures/competency/dependency-edit-invalidation/SCENARIO.md
@@ -0,0 +1,5 @@
+# Dependency edit invalidates only necessary claims
+
+Procedure: reconstruct checkout total, then change `config.py:TAX_RATE`.
+
+Expected: invalidate/review claims depending on TAX_RATE and checkout total. Do not invalidate unrelated support configuration or unrelated connected concepts.
diff --git a/tests/fixtures/competency/dependency-edit-invalidation/checkout.py b/tests/fixtures/competency/dependency-edit-invalidation/checkout.py
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+++ b/tests/fixtures/competency/dependency-edit-invalidation/checkout.py
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+from config import TAX_RATE
+
+def total(net):
+    return net * (1 + TAX_RATE)
diff --git a/tests/fixtures/competency/dependency-edit-invalidation/config.py b/tests/fixtures/competency/dependency-edit-invalidation/config.py
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+++ b/tests/fixtures/competency/dependency-edit-invalidation/config.py
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+TAX_RATE = 0.20
diff --git a/tests/fixtures/competency/dependency-edit-invalidation/unrelated.py b/tests/fixtures/competency/dependency-edit-invalidation/unrelated.py
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+++ b/tests/fixtures/competency/dependency-edit-invalidation/unrelated.py
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+SUPPORT_EMAIL = 'help@example.invalid'