Merge pull request #4403 from ethereum-optimism/sc/ctb-mint-manager-tests

test(ctb): MintManager tests

packages/contracts-bedrock/.gas-snapshot

@@ -164,6 +164,15 @@ MerkleTrie_Test:test_get_validProof9_succeeds() (gas: 50593)
 MerkleTrie_Test:test_get_wrongKeyProof_reverts() (gas: 53848)
 MerkleTrie_Test:test_get_zeroBranchValueLength_reverts() (gas: 43270)
 MerkleTrie_Test:test_get_zeroLengthKey_reverts() (gas: 3632)
+MintManager_Test:test_constructor_succeeds() (gas: 10535)
+MintManager_Test:test_mint_afterPeriodElapsed_succeeds() (gas: 148117)
+MintManager_Test:test_mint_beforePeriodElapsed_reverts() (gas: 140455)
+MintManager_Test:test_mint_fromNotOwner_reverts() (gas: 10987)
+MintManager_Test:test_mint_fromOwner_succeeds() (gas: 137241)
+MintManager_Test:test_mint_moreThanCap_reverts() (gas: 142523)
+MintManager_Test:test_upgrade_fromNotOwner_reverts() (gas: 10974)
+MintManager_Test:test_upgrade_fromOwner_succeeds() (gas: 23463)
+MintManager_Test:test_upgrade_toZeroAddress_reverts() (gas: 11003)
 OptimismMintableERC20_Test:test_bridge_succeeds() (gas: 7643)
 OptimismMintableERC20_Test:test_burn_notBridge_reverts() (gas: 11165)
 OptimismMintableERC20_Test:test_burn_succeeds() (gas: 51013)

packages/contracts-bedrock/contracts/test/MintManager.t.sol

+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
+
+import { CommonTest } from "./CommonTest.t.sol";
+import { MintManager } from "../governance/MintManager.sol";
+import { GovernanceToken } from "../governance/GovernanceToken.sol";
+
+contract MintManager_Test is CommonTest {
+    address constant owner = address(0x1234);
+    address constant rando = address(0x5678);
+    GovernanceToken internal gov;
+    MintManager internal manager;
+
+    function setUp() external {
+        vm.prank(owner);
+        gov = new GovernanceToken();
+
+        vm.prank(owner);
+        manager = new MintManager(owner, address(gov));
+
+        vm.prank(owner);
+        gov.transferOwnership(address(manager));
+    }
+
+    function test_constructor_succeeds() external {
+        assertEq(manager.owner(), owner);
+        assertEq(address(manager.governanceToken()), address(gov));
+    }
+
+    function test_mint_fromOwner_succeeds() external {
+        // Mint once.
+        vm.prank(owner);
+        manager.mint(owner, 100);
+
+        // Token balance increases.
+        assertEq(gov.balanceOf(owner), 100);
+    }
+
+    function test_mint_fromNotOwner_reverts() external {
+        // Mint from rando fails.
+        vm.prank(rando);
+        vm.expectRevert("Ownable: caller is not the owner");
+        manager.mint(owner, 100);
+    }
+
+    function test_mint_afterPeriodElapsed_succeeds() external {
+        // Mint once.
+        vm.prank(owner);
+        manager.mint(owner, 100);
+
+        // Token balance increases.
+        assertEq(gov.balanceOf(owner), 100);
+
+        // Mint again after period elapsed (2% max).
+        vm.warp(block.timestamp + manager.MINT_PERIOD() + 1);
+        vm.prank(owner);
+        manager.mint(owner, 2);
+
+        // Token balance increases.
+        assertEq(gov.balanceOf(owner), 102);
+    }
+
+    function test_mint_beforePeriodElapsed_reverts() external {
+        // Mint once.
+        vm.prank(owner);
+        manager.mint(owner, 100);
+
+        // Token balance increases.
+        assertEq(gov.balanceOf(owner), 100);
+
+        // Mint again.
+        vm.prank(owner);
+        vm.expectRevert("MintManager: minting not permitted yet");
+        manager.mint(owner, 100);
+
+        // Token balance does not increase.
+        assertEq(gov.balanceOf(owner), 100);
+    }
+
+    function test_mint_moreThanCap_reverts() external {
+        // Mint once.
+        vm.prank(owner);
+        manager.mint(owner, 100);
+
+        // Token balance increases.
+        assertEq(gov.balanceOf(owner), 100);
+
+        // Mint again (greater than 2% max).
+        vm.warp(block.timestamp + manager.MINT_PERIOD() + 1);
+        vm.prank(owner);
+        vm.expectRevert("MintManager: mint amount exceeds cap");
+        manager.mint(owner, 3);
+
+        // Token balance does not increase.
+        assertEq(gov.balanceOf(owner), 100);
+    }
+
+    function test_upgrade_fromOwner_succeeds() external {
+        // Upgrade to new manager.
+        vm.prank(owner);
+        manager.upgrade(rando);
+
+        // New manager is rando.
+        assertEq(gov.owner(), rando);
+    }
+
+    function test_upgrade_fromNotOwner_reverts() external {
+        // Upgrade from rando fails.
+        vm.prank(rando);
+        vm.expectRevert("Ownable: caller is not the owner");
+        manager.upgrade(rando);
+    }
+
+    function test_upgrade_toZeroAddress_reverts() external {
+        // Upgrade to zero address fails.
+        vm.prank(owner);
+        vm.expectRevert("MintManager: mint manager cannot be the zero address");
+        manager.upgrade(address(0));
+    }
+}