diff --git a/l1-contracts/test/foundry/unit/concrete/UncheckedMath/UncheckedAdd.t.sol b/l1-contracts/test/foundry/unit/concrete/UncheckedMath/UncheckedAdd.t.sol
new file mode 100644
index 000000000..847818a65
--- /dev/null
+++ b/l1-contracts/test/foundry/unit/concrete/UncheckedMath/UncheckedAdd.t.sol
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.20;
+
+import {UncheckedMathTest} from "./_UncheckedMath_Shared.t.sol";
+import {UncheckedMath} from "solpp/common/libraries/UncheckedMath.sol";
+
+contract UncheckedAddTest is UncheckedMathTest {
+    using UncheckedMath for uint256;
+
+    function test_Add() public {
+        uint256 a = 1234;
+        uint256 b = 4321;
+        uint256 c = a.uncheckedAdd(b);
+        assertEq(c, 5555);
+    }
+
+    function test_AddWithOverflow() public {
+        uint256 a = type(uint256).max;
+        uint256 b = 1;
+
+        // uncheckedAdd does not fail
+        uint256 c = a.uncheckedAdd(b);
+        assertEq(c, 0);
+
+        // regular addition fails with overflow
+        vm.expectRevert();
+        a + b;
+    }
+}
diff --git a/l1-contracts/test/foundry/unit/concrete/UncheckedMath/UncheckedInc.t.sol b/l1-contracts/test/foundry/unit/concrete/UncheckedMath/UncheckedInc.t.sol
new file mode 100644
index 000000000..aa1a669f7
--- /dev/null
+++ b/l1-contracts/test/foundry/unit/concrete/UncheckedMath/UncheckedInc.t.sol
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.20;
+
+import {UncheckedMathTest} from "./_UncheckedMath_Shared.t.sol";
+import {UncheckedMath} from "solpp/common/libraries/UncheckedMath.sol";
+
+contract UncheckedIncTest is UncheckedMathTest {
+    using UncheckedMath for uint256;
+
+    function test_Inc() public {
+        uint256 a = 1234;
+        uint256 c = a.uncheckedInc();
+        assertEq(c, 1235);
+    }
+
+    function test_IncWithOverflow() public {
+        uint256 a = type(uint256).max;
+
+        // uncheckedInc does not fail
+        uint256 c = a.uncheckedInc();
+        assertEq(c, 0);
+
+        // regular addition fails with overflow
+        vm.expectRevert();
+        a + 1;
+    }
+}
diff --git a/l1-contracts/test/foundry/unit/concrete/UncheckedMath/_UncheckedMath_Shared.t.sol b/l1-contracts/test/foundry/unit/concrete/UncheckedMath/_UncheckedMath_Shared.t.sol
new file mode 100644
index 000000000..badc0233e
--- /dev/null
+++ b/l1-contracts/test/foundry/unit/concrete/UncheckedMath/_UncheckedMath_Shared.t.sol
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.20;
+
+import {Test} from "forge-std/Test.sol";
+
+contract UncheckedMathTest is Test {}