diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+++ b/CONTRIBUTING.md
@@ -0,0 +1,3 @@
+# Fixtures
+
+Local stub templates live under `fixtures/` for CI `file://` scaffolding tests.
diff --git a/fixtures/extensions/ruff-setup/template/ruff.toml b/fixtures/extensions/ruff-setup/template/ruff.toml
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+++ b/fixtures/extensions/ruff-setup/template/ruff.toml
@@ -0,0 +1 @@
+# ruff addon
diff --git a/fixtures/templates/example-cli/cpa.config.json b/fixtures/templates/example-cli/cpa.config.json
new file mode 100644
index 0000000..0967ef4
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+++ b/fixtures/templates/example-cli/cpa.config.json
@@ -0,0 +1 @@
+{}
diff --git a/fixtures/templates/example-cli/template/README.md b/fixtures/templates/example-cli/template/README.md
new file mode 100644
index 0000000..a7b246e
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+++ b/fixtures/templates/example-cli/template/README.md
@@ -0,0 +1 @@
+# Example CLI
diff --git a/fixtures/templates/example-cli/template/pyproject.toml b/fixtures/templates/example-cli/template/pyproject.toml
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+++ b/fixtures/templates/example-cli/template/pyproject.toml
@@ -0,0 +1,5 @@
+[project]
+name = "example-cli"
+version = "0.0.0"
+requires-python = ">=3.12"
+