add tree+leaf_index test

clients/js/test/getAssetSignatures.test.ts

@@ -29,4 +29,30 @@ DAS_API_ENDPOINTS.forEach((endpoint) => {
       slot: 356098214,
     });
   });
+
+  test(`it can fetch the signatures of a compressed asset by leaf index and tree (${endpoint.name})`, async (t) => {
+    // Given a minted NFT on mainnet.
+    const umi = createUmi(endpoint.url);
+    const tree = publicKey('J1imb8C8SPzofrtgCxkN4nsKwHevzxgvHGeYBKFEDEmE');
+    const leaf_index = 0;
+    // When we fetch the Signatures for the asset.
+    const signatures = await umi.rpc.getAssetSignatures({ tree, leaf_index });
+
+    // Then we expect to find 2 signatures.
+    t.is(signatures.total, 2);
+    t.is(signatures.limit, 1000);
+    t.is(signatures.items.length, 2);
+    t.like(signatures.items[0], <DasApiTransactionSignature>{
+      signature:
+        '3Ki9QJTC2V1oNhkkhvJAJ4DEBRdMMrvKqctsyPhGL5JGkZz72xAsgTQh4vAEuJNtkxTxdmWg7RhkSXwU2JNRdSVh',
+      instruction: 'MintToCollectionV1',
+      slot: 356098299,
+    });
+    t.like(signatures.items[1], <DasApiTransactionSignature>{
+      signature:
+        '4rNhZukEBfuGxWxesRgStu1PqvStycu1fhNiftXVUcCygazXLpz6BubNCMywBW9eQLKtLa58FSqgyjDxHSTuFYy8',
+      instruction: 'CreateTree',
+      slot: 356098214,
+    });
+  });
 });