diff --git a/tests/package/wp7-02-controlled-executor.test.mjs b/tests/package/wp7-02-controlled-executor.test.mjs
index 9498f08..c106e8e 100644
--- a/tests/package/wp7-02-controlled-executor.test.mjs
+++ b/tests/package/wp7-02-controlled-executor.test.mjs
@@ -216,6 +216,15 @@ test("TDD-WP7-EXT-001 retries one timeout once and records every real attempt",
 });
 
 test("TDD-WP7-EXT-001 describes only protocol structure and stops repeated contract-shape calls", async () => {
+  const uriShape = describeProviderResponseShape({ candidates: [{ content: { parts: [{ text: "https://first.invalid/generated" }] } }] });
+  const equivalentUriShape = describeProviderResponseShape({ candidates: [{ content: { parts: [{ text: "https://other.invalid/result" }] } }] });
+  assert.deepEqual(uriShape, equivalentUriShape);
+  assert.match(JSON.stringify(uriShape), /"representation":"uri"/);
+  assert.doesNotMatch(JSON.stringify(uriShape), /first\.invalid|other\.invalid/);
+  assert.match(JSON.stringify(describeProviderResponseShape({ candidates: [{ content: { parts: [{ text: "![result](https:\/\/example.invalid\/generated)" }] } }] })), /"representation":"markdown_uri"/);
+  assert.match(JSON.stringify(describeProviderResponseShape({ candidates: [{ content: { parts: [{ text: "data:image\/png;base64,AAAA" }] } }] })), /"representation":"inline_media"/);
+  assert.match(JSON.stringify(describeProviderResponseShape({ candidates: [{ content: { parts: [{ text: "ordinary explanation" }] } }] })), /"representation":"plain_text"/);
+
   let fetchCalls = 0;
   const execution = await runControlledRealScenarios({
     fetchImpl: async () => {