diff --git a/tests/test_hourly_opencode_nvidia_contract.py b/tests/test_hourly_opencode_nvidia_contract.py
index dc1410e..47c6483 100644
--- a/tests/test_hourly_opencode_nvidia_contract.py
+++ b/tests/test_hourly_opencode_nvidia_contract.py
@@ -128,3 +128,20 @@ def test_buyer_readme_identifies_the_opencode_nvidia_maintainer() -> None:
     assert "bounded OpenCode maintainer" in readme
     assert "`NVIDIA_NIM_API_KEY`" in readme
     assert "COPILOT_GITHUB_TOKEN" not in readme
+
+
+def test_product_workflow_keeps_printf_escapes_on_indented_yaml_lines() -> None:
+    """Keep shell format escapes on one YAML line so workflow parsing succeeds."""
+    workflow_lines = _read(PRODUCT_WORKFLOW_PATH).splitlines()
+    checksum_line = (
+        "          printf '%s  %s\\n' "
+        '"$OPENCODE_SHA256" "$archive" | sha256sum --check -'
+    )
+    fallback_line = (
+        "            printf '%s\\n' "
+        "'{\"type\":\"error\",\"message\":\"OpenCode produced no final result\"}' "
+        '>"$result_file"'
+    )
+
+    assert checksum_line in workflow_lines
+    assert fallback_line in workflow_lines