test: foundry support added

.gas-snapshot

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+TestContract:testBar() (gas: 401)

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  run-ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Install deps
+        run: forge install
+
+      - name: Check gas snapshots
+        run: forge snapshot --check
+
+      - name: Run tests
+        run: forge test

.gitignore

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+cache/
+out/

src/Contract.sol

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+// SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.13;
+
+contract Contract { }

test/Contract.t.sol

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+// SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.13;
+
+import "forge-std/Test.sol";
+
+import "src/Contract.sol";
+
+contract TestContract is Test {
+    Contract c;
+
+    function setUp() public {
+        c = new Contract();
+    }
+
+    function testBar() public {
+        assertEq(uint256(1), uint256(1), "ok");
+    }
+
+    function testFoo(uint256 x) public {
+        vm.assume(x < type(uint128).max);
+        assertEq(x + x, x * 2);
+    }
+}