itest: extend supply commit ignore test with leaf fetch and validate

Extend the supply commit ignore test to include basic fetching and
validation of ignore leaves.

Author: ffranr

itest/supply_commit_test.go

@@ -390,6 +390,25 @@ func testSupplyCommitIgnoreAsset(t *harnessTest) {
 	// to the supply commitment delegation key for signing.
 	_, err = secondTapd.IgnoreAssetOutPoint(ctxb, ignoreReq)
 	require.ErrorContains(t.t, err, "delegation key locator not found")
+
+	// Fetch the supply leaves to ensure that the ignored asset outpoint is
+	// included in the supply leaves.
+	//
+	// nolint: lll
+	respLeaves, err := t.tapd.FetchSupplyLeaves(
+		ctxb, &unirpc.FetchSupplyLeavesRequest{
+			GroupKey: &unirpc.FetchSupplyLeavesRequest_GroupKeyBytes{
+				GroupKeyBytes: groupKeyBytes,
+			},
+		},
+	)
+	require.NoError(t.t, err)
+	require.NotNil(t.t, respLeaves)
+
+	require.Len(t.t, respLeaves.IgnoreLeaves, 1)
+	require.EqualValues(
+		t.t, respLeaves.IgnoreLeaves[0].LeafNode.RootSum, 10,
+	)
 }
 
 // AssertInclusionProof checks that the inclusion proof for a given leaf key