feat: Add foundry environment and CI

foundry/lib/forge-std/test/StdJson.t.sol

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.7.0 <0.9.0;
+
+import {Test, stdJson} from "../src/Test.sol";
+
+contract StdJsonTest is Test {
+    using stdJson for string;
+
+    string root;
+    string path;
+
+    function setUp() public {
+        root = vm.projectRoot();
+        path = string.concat(root, "/test/fixtures/test.json");
+    }
+
+    struct SimpleJson {
+        uint256 a;
+        string b;
+    }
+
+    struct NestedJson {
+        uint256 a;
+        string b;
+        SimpleJson c;
+    }
+
+    function test_readJson() public view {
+        string memory json = vm.readFile(path);
+        assertEq(json.readUint(".a"), 123);
+    }
+
+    function test_writeJson() public {
+        string memory json = "json";
+        json.serialize("a", uint256(123));
+        string memory semiFinal = json.serialize("b", string("test"));
+        string memory finalJson = json.serialize("c", semiFinal);
+        finalJson.write(path);
+
+        string memory json_ = vm.readFile(path);
+        bytes memory data = json_.parseRaw("$");
+        NestedJson memory decodedData = abi.decode(data, (NestedJson));
+
+        assertEq(decodedData.a, 123);
+        assertEq(decodedData.b, "test");
+        assertEq(decodedData.c.a, 123);
+        assertEq(decodedData.c.b, "test");
+    }
+}