Add test checking fail to fetch asset metadata

test/manual/TokenMetadataFetchFailed.md

@@ -0,0 +1,65 @@
+
+# Error reported in API when failing to fetch metadata
+
+## OS
+
+Any
+
+## Steps
+
+1. Start cardano-node and cardano-wallet on `testnet` using latest [config](https://hydra.iohk.io/job/Cardano/iohk-nix/cardano-deployment/latest/download/1/index.html). Make sure both are fully synced.
+
+```bash
+$ cardano-node run \
+		--config ./*-config.json \
+		--topology ./*-topology.json \
+		--database-path ./db \
+		--socket-path ./node.socket
+
+$ cardano-wallet serve --port 8090 \
+		--node-socket ../relay1/node.socket \
+		--testnet testnet-byron-genesis.json  \
+		--database ./wallet-db \
+		--token-metadata-server http://localhost/
+```
+Make sure wallet server `--token-metadata-server` points to an url which is not token metadata server.
+
+2. On the wallet that has some assets check that `"metadata_error":"fetch"` is returned when getting assets.
+ - when listing all assets
+```
+$ curl -X GET http://localhost:8090/v2/wallets/73d38c71e4b8b5d71769622ab4f5bfdedbb7c39d/assets
+
+[
+...
+{
+	"asset_name": "496e737472756d656e74616c4f4b3133",
+	"fingerprint": "asset123svc349ccm6njzpu6w3uzu6cnw87t9l95dmcy",
+	"metadata_error": "fetch",
+	"policy_id": "c7b3f8f9d6a02027e7b5ce2a4da0ff3f68d6d49d4ca58c96c5900b37"
+},
+...
+]
+```
+- when getting asset with only policy id
+```
+$ curl -X GET http://localhost:8090/v2/wallets/73d38c71e4b8b5d71769622ab4f5bfdedbb7c39d/assets/789ef8ae89617f34c07f7f6a12e4d65146f958c0bc15a97b4ff169f1
+
+{
+  "asset_name": "",
+  "fingerprint": "asset1656gm7zkherdvxkn52mhaxkkw343qtkqgv0h8c",
+  "metadata_error": "fetch",
+  "policy_id": "789ef8ae89617f34c07f7f6a12e4d65146f958c0bc15a97b4ff169f1"
+}
+```
+ - when getting asset with policy id and asset name
+```
+$ $ curl -X GET http://localhost:8090/v2/wallets/73d38c71e4b8b5d71769622ab4f5bfdedbb7c39d/assets/005bd7d46219700eccb77cbf7122055a0b26cd064db51e1277cc1b0b/653265636f696e3635
+
+{
+  "asset_name": "653265636f696e3635",
+  "fingerprint": "asset1txvs0057gd63g02q4ttrd86vgxlv3scjua7r03",
+  "metadata_error": "fetch",
+  "policy_id": "005bd7d46219700eccb77cbf7122055a0b26cd064db51e1277cc1b0b"
+}
+
+```