diff --git a/flake.nix b/flake.nix
index 6462f98b5..41f94c930 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,8 +16,10 @@
       in {
         devShell = with pkgs;
           mkShell {
+            SOLHINT_PATH = "$HOME/.solhint.json";
             SOLC_VERSION = "0.8.15";
-            buildInputs = [ foundry.defaultPackage.${system} solc-select yarn ];
+            buildInputs =
+              [ foundry.defaultPackage.${system} solc-select yarn nodejs-14_x ];
             shellHook = ''
               solc-select install $SOLC_VERSION
             '';
diff --git a/test/YieldSpaceMath.t.sol b/test/YieldSpaceMath.t.sol
new file mode 100644
index 000000000..d271a9a9c
--- /dev/null
+++ b/test/YieldSpaceMath.t.sol
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.13;
+
+import { Test } from "forge-std/Test.sol";
+import { YieldSpaceMath } from "contracts/libraries/YieldSpaceMath.sol";
+
+contract YieldSpaceMathTest is Test {
+    function test__calculateOutGivenIn_1() public {
+        assertEq(
+            YieldSpaceMath.calculateOutGivenIn(
+                56.79314253e18, // shareReserves
+                62.38101813e18, // bondReserves
+                119.1741606776616e18, // bondReserveAdjustment
+                5.03176076e18, // amountOut
+                0.08065076081220067e18, // t
+                1e18, // s
+                1e18, // c
+                1e18, // mu
+                true // isBondIn
+            ),
+            5.500250311701939082e18
+        );
+    }
+
+    function test__calculateOutGivenIn_2() public {
+        assertEq(
+            YieldSpaceMath.calculateOutGivenIn(
+                61.824903300361854e18, // shareReserves
+                56.92761678068477e18, // bondReserves
+                119.1741606776616e18, // bondReserveAdjustment
+                5.500250311701939e18, // amountOut
+                0.08065076081220067e18, // t
+                1e18, // s
+                1e18, // c
+                1e18, // mu
+                false // isBondIn
+            ),
+            5.031654806080805188e18
+        );
+    }
+}