Added tests from OZ repo

contracts/CallReceiverMock.sol

@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.20;
+
+contract CallReceiverMock {
+    event MockFunctionCalled();
+    event MockFunctionCalledWithArgs(uint256 a, uint256 b);
+
+    uint256[] private _array;
+
+    function mockFunction() public payable returns (string memory) {
+        emit MockFunctionCalled();
+
+        return "0x1234";
+    }
+
+    function mockFunctionEmptyReturn() public payable {
+        emit MockFunctionCalled();
+    }
+
+    function mockFunctionWithArgs(uint256 a, uint256 b) public payable returns (string memory) {
+        emit MockFunctionCalledWithArgs(a, b);
+
+        return "0x1234";
+    }
+
+    function mockFunctionNonPayable() public returns (string memory) {
+        emit MockFunctionCalled();
+
+        return "0x1234";
+    }
+
+    function mockStaticFunction() public pure returns (string memory) {
+        return "0x1234";
+    }
+
+    function mockFunctionRevertsNoReason() public payable {
+        revert();
+    }
+
+    function mockFunctionRevertsReason() public payable {
+        revert("CallReceiverMock: reverting");
+    }
+
+    function mockFunctionThrows() public payable {
+        assert(false);
+    }
+
+    function mockFunctionOutOfGas() public payable {
+        for (uint256 i = 0; ; ++i) {
+            _array.push(i);
+        }
+    }
+
+    function mockFunctionWritesStorage(bytes32 slot, bytes32 value) public returns (string memory) {
+        assembly {
+            sstore(slot, value)
+        }
+        return "0x1234";
+    }
+}
+
+contract CallReceiverMockTrustingForwarder is CallReceiverMock {
+    address private _trustedForwarder;
+
+    constructor(address trustedForwarder_) {
+        _trustedForwarder = trustedForwarder_;
+    }
+
+    function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
+        return forwarder == _trustedForwarder;
+    }
+}

contracts/PushGovernor.sol

@@ -27,7 +27,7 @@ contract PushGovernor is Initializable, GovernorUpgradeable, GovernorSettingsUpg
     }
 
     function quorum(uint256 blockNumber) public pure override returns (uint256) {
-        return 40000000e18;
+        return 4e18;
     }
 
     // The following functions are overrides required by Solidity.