Add mock and include in testable toml

auxiliary/OpGasPriceOracle/cannonfile.test.toml

@@ -1,2 +1,40 @@
+name = "op-gas-price-oracle"
 version = "<%= package.version %>-testable"
-include = ["cannonfile.toml"]
+
+[setting.baseFee]
+defaultValue = "30000000"
+
+[setting.gasPrice]
+defaultValue = "30000000"
+
+[setting.l1BaseFee]
+defaultValue = "50000000000"
+
+[setting.overhead]
+defaultValue = "200"
+
+[setting.scalar]
+defaultValue = "684000"
+
+[setting.internall1GasUsed]
+defaultValue = "10000"
+
+[setting.internall1Fee]
+defaultValue = "1000"
+
+[contract.mockOVMGasPriceOracle]
+artifact = "contracts/mocks/MockOVMGasPriceOracle.sol:MockOVMGasPriceOracle"
+args = [
+    "<%= settings.gasPrice %>",
+    "<%= settings.overhead %>",
+    "<%= settings.baseFee %>",
+    "<%= settings.l1BaseFee %>",
+    "<%= settings.scalar %>",
+    "<%= settings.internall1GasUsed %>",
+    "<%= settings.internall1Fee %>"
+]
+
+[contract.OpGasPriceOracle]
+artifact = "contracts/OpGasPriceOracle.sol:OpGasPriceOracle"
+args = ["<%= contracts.mockOVMGasPriceOracle.address %>"]
+create2 = true

auxiliary/OpGasPriceOracle/contracts/mocks/MockOVMGasPriceOracle.sol

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.8.0;
+
+import "../interfaces/IOVM_GasPriceOracle.sol";
+
+contract MockOVMGasPriceOracle is IOVM_GasPriceOracle {
+    uint256 public constant DECIMALS = 6;
+
+    uint256 public gasPrice;
+    uint256 public overhead;
+    uint256 public baseFee;
+    uint256 public l1BaseFee;
+    uint256 public scalar;
+    uint256 public internall1GasUsed;
+    uint256 public internall1Fee;
+
+    constructor(
+        uint256 _gasPrice,
+        uint256 _overhead,
+        uint256 _baseFee,
+        uint256 _l1BaseFee,
+        uint256 _scalar,
+        uint256 _internall1GasUsed,
+        uint256 _internall1Fee
+    ) {
+        gasPrice = _gasPrice;
+        overhead = _overhead;
+        baseFee = _baseFee;
+        l1BaseFee = _l1BaseFee;
+        scalar = _scalar;
+        internall1GasUsed = _internall1GasUsed;
+        internall1Fee = _internall1Fee;
+    }
+
+    function setParams(
+        uint256 _gasPrice,
+        uint256 _overhead,
+        uint256 _baseFee,
+        uint256 _l1BaseFee,
+        uint256 _scalar,
+        uint256 _internall1GasUsed,
+        uint256 _internall1Fee
+    ) external {
+        gasPrice = _gasPrice;
+        overhead = _overhead;
+        baseFee = _baseFee;
+        l1BaseFee = _l1BaseFee;
+        scalar = _scalar;
+        internall1GasUsed = _internall1GasUsed;
+        internall1Fee = _internall1Fee;
+    }
+
+    function decimals() external pure returns (uint256) {
+        return DECIMALS;
+    }
+
+    function getL1Fee(bytes memory _data) external view returns (uint256) {
+        _data;
+        return internall1Fee;
+    }
+
+    function getL1GasUsed(bytes memory _data) external view returns (uint256) {
+        _data;
+        return internall1GasUsed;
+    }
+}