test cyclo receipt uri

.gitmodules

@@ -16,3 +16,6 @@
 [submodule "lib/rain.tier.interface"]
 	path = lib/rain.tier.interface
 	url = https://github.com/rainlanguage/rain.tier.interface
+[submodule "lib/solady"]
+	path = lib/solady
+	url = https://github.com/Vectorized/solady

src/concrete/receipt/CycloReceipt.sol

@@ -14,6 +14,9 @@ import {FIXED_POINT_ONE} from "rain.math.fixedpoint/lib/FixedPointDecimalConstan
 /// @dev The SVG of Cyclo logo is pinned on IPFS.
 string constant CYCLO_RECEIPT_SVG_URI = "ipfs://bafybeidjgkxfpk7nujlnx7jwvjvmtcbkfg53vnlc2cc6ftqfhapqkmtahq";
 
+/// @dev The prefix for data URIs as base64 encoded JSON.
+string constant DATA_URI_BASE64_PREFIX = "data:application/json;base64,";
+
 contract CycloReceipt is Receipt {
     function uri(uint256 id) public view virtual override returns (string memory) {
         bytes memory json = abi.encodePacked(
@@ -30,6 +33,6 @@ contract CycloReceipt is Receipt {
             "\"}"
         );
 
-        return string(abi.encodePacked("data:application/json;base64,", Base64.encode(json)));
+        return string(abi.encodePacked(DATA_URI_BASE64_PREFIX, Base64.encode(json)));
     }
 }

test/src/concrete/receipt/CycloReceipt.metadata.t.sol

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: LicenseRef-DCL-1.0
+// SPDX-FileCopyrightText: Copyright (c) 2020 thedavidmeister
+pragma solidity ^0.8.25;
+
+import {Test} from "forge-std/Test.sol";
+import {Base64} from "solady/utils/Base64.sol";
+import {CycloReceipt, DATA_URI_BASE64_PREFIX, CYCLO_RECEIPT_SVG_URI} from "src/concrete/receipt/CycloReceipt.sol";
+
+contract CycloReceiptMetadataTest is Test {
+    struct URIJson {
+        string description;
+        string image;
+        string name;
+    }
+
+    function testCycloReceiptURI() external {
+        CycloReceipt receipt = new CycloReceipt();
+
+        string memory uri = receipt.uri(0.01544e18);
+        uint256 uriLength = bytes(uri).length;
+        assembly ("memory-safe") {
+            mstore(uri, 29)
+        }
+        assertEq(uri, DATA_URI_BASE64_PREFIX);
+        assembly ("memory-safe") {
+            uri := add(uri, 29)
+            mstore(uri, sub(uriLength, 29))
+        }
+
+        bytes memory uriDecoded = Base64.decode(uri);
+        bytes memory uriJsonData = vm.parseJson(string(uriDecoded));
+
+        URIJson memory uriJson = abi.decode(uriJsonData, (URIJson));
+        assertEq(
+            uriJson.description,
+            "1 of these receipts can be burned alongside 1 cysFLR to redeem 64.766839378238341968 sFLR. Reedem at https://cyclo.finance."
+        );
+        assertEq(uriJson.image, CYCLO_RECEIPT_SVG_URI);
+        assertEq(uriJson.name, "Receipt for cyclo lock at 0.01544 USD per sFLR.");
+    }
+}