diff --git a/eth-contracts/common/deployment.ts b/eth-contracts/common/deployment.ts
index eb02d02..3b88479 100644
--- a/eth-contracts/common/deployment.ts
+++ b/eth-contracts/common/deployment.ts
@@ -17,9 +17,12 @@ interface DeploymentOptions {
     maxStake: number; // for randomizer
     actualStake: number; // of each node
     nodeCount: number;
+    logging: boolean;
 }
 
 async function deploy(opts: DeploymentOptions): Promise<Environment> {
+    const logger = new LogWrapper(opts.logging);
+
     const accounts = (await ethers.getSigners()).slice(0, opts.nodeCount);
 
     const DioneToken = await ethers.getContractFactory("DioneToken");
@@ -30,23 +33,23 @@ async function deploy(opts: DeploymentOptions): Promise<Environment> {
 
     const dioneToken = await DioneToken.deploy();
     await dioneToken.deployed();
-    console.log("DioneToken deployed to:", dioneToken.address);
+    logger.log("DioneToken deployed to:", dioneToken.address);
 
     const dioneStaking = await DioneStaking.deploy(dioneToken.address, ethers.constants.WeiPerEther.mul(opts.reward), 0, ethers.constants.WeiPerEther.mul(opts.minStake));
     await dioneStaking.deployed();
-    console.log("staking_contract_address = \"" + dioneStaking.address+ "\"");
+    logger.log("staking_contract_address = \"" + dioneStaking.address+ "\"");
 
     const dioneDispute = await DioneDispute.deploy(dioneStaking.address, opts.voteWindowTime);
     await dioneDispute.deployed();
-    console.log("dispute_contract_address = \"" + dioneDispute.address+ "\"");
+    logger.log("dispute_contract_address = \"" + dioneDispute.address+ "\"");
 
     const dioneOracle = await DioneOracle.deploy(dioneStaking.address);
     await dioneOracle.deployed();
-    console.log("oracle_contract_address = \"" + dioneOracle.address+ "\"");
+    logger.log("oracle_contract_address = \"" + dioneOracle.address+ "\"");
 
     const mediator = await Mediator.deploy(dioneOracle.address);
     await mediator.deployed();
-    console.log("mediator_contract_address = \"" + mediator.address +"\"")
+    logger.log("mediator_contract_address = \"" + mediator.address +"\"")
 
     const env: Environment = {
         dioneToken: dioneToken,
@@ -96,7 +99,7 @@ async function deploy(opts: DeploymentOptions): Promise<Environment> {
         await token.approve(dioneStaking.address, ethers.constants.WeiPerEther.mul(stakeValue));
         await staking.stake(ethers.constants.WeiPerEther.mul(stakeValue));
         const stake = await dioneStaking.minerStake(accounts[i].address);
-        console.log(accounts[i].address, stake.toString());
+        logger.log(accounts[i].address, stake.toString());
     }
 
     return env;
@@ -107,4 +110,16 @@ export default deploy;
 // min and max included
 function randomInt(min: number, max: number){
     return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+class LogWrapper {
+    private enabled: boolean;
+
+    constructor(_enabled: boolean) {
+        this.enabled = _enabled;
+    }
+
+    public log(message?: any, ...optionalParams: any[]): void {
+        if(this.enabled) console.log(message, optionalParams);
+    }
 }
\ No newline at end of file
diff --git a/eth-contracts/contracts/DioneOracle.sol b/eth-contracts/contracts/DioneOracle.sol
index 9909e71..c74b9bf 100644
--- a/eth-contracts/contracts/DioneOracle.sol
+++ b/eth-contracts/contracts/DioneOracle.sol
@@ -50,7 +50,7 @@ contract DioneOracle {
   );
 
   modifier onlyPendingRequest(uint256 _reqID) {
-    require(pendingRequests[_reqID].requestSender != address(0), "This request is not pending");
+    require(pendingRequests[_reqID].requestSender != address(0), "this request is not pending");
     _;
   }
 
@@ -86,6 +86,7 @@ contract DioneOracle {
   }
 
   function submitOracleRequest(uint256 _reqID, bytes memory _data) public onlyPendingRequest(_reqID) returns (bool) {
+    require((pendingRequests[_reqID].deadline - block.timestamp) <= MAXIMUM_DELAY, "submission has exceeded the deadline");
     delete pendingRequests[_reqID];
     dioneStaking.mine(msg.sender);
     (bool success, ) = pendingRequests[_reqID].callbackAddress.call(abi.encodeWithSelector(pendingRequests[_reqID].callbackMethodID, _reqID, _data));
diff --git a/eth-contracts/scripts/deploy.ts b/eth-contracts/scripts/deploy.ts
index 91226d6..1be96a1 100644
--- a/eth-contracts/scripts/deploy.ts
+++ b/eth-contracts/scripts/deploy.ts
@@ -12,7 +12,8 @@ async function main() {
       randomizeStake: false,
       maxStake: 0, // don't use this deployment feature
       actualStake: 5000,
-      nodeCount: 4
+      nodeCount: 4,
+      logging: true
     });
   }
   
diff --git a/eth-contracts/test/DioneDispute.ts b/eth-contracts/test/DioneDispute.ts
index 8fd6e60..5763348 100644
--- a/eth-contracts/test/DioneDispute.ts
+++ b/eth-contracts/test/DioneDispute.ts
@@ -16,7 +16,8 @@ describe("DioneDispute", function () {
       randomizeStake: false,
       maxStake: 0, // don't use this deployment feature
       actualStake: 9000,
-      nodeCount: 4
+      nodeCount: 4,
+      logging: false
     });
 
     dioneDispute = contracts.dioneDispute;
diff --git a/eth-contracts/test/DioneOracle.ts b/eth-contracts/test/DioneOracle.ts
index be0f010..d6058b6 100644
--- a/eth-contracts/test/DioneOracle.ts
+++ b/eth-contracts/test/DioneOracle.ts
@@ -15,7 +15,8 @@ describe("DioneOracle", function () {
       randomizeStake: false,
       maxStake: 0, // don't use this deployment feature
       actualStake: 9000,
-      nodeCount: 4
+      nodeCount: 4,
+      logging: false
     });
     dioneOracle = contracts.dioneOracle;
   });
@@ -31,5 +32,34 @@ describe("DioneOracle", function () {
     await expect(dioneOracle.cancelOracleRequest(1))
       .to.emit(dioneOracle, 'CancelOracleRequest')
       .withArgs(1);
+
+    // let's check whether submission fails
+    await expect(dioneOracle.submitOracleRequest(1, BigNumber.from(0x8da5cb5b)))
+      .to.be.revertedWith("this request is not pending");
+  });
+
+  it("should create request and submit it", async function() {
+    await dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", dioneOracle.address, BigNumber.from(0x8da5cb5b));
+    await expect(dioneOracle.submitOracleRequest(1, BigNumber.from(0x8da5cb5b)))
+      .to.emit(dioneOracle, "SubmittedOracleRequest")
+      .withArgs(1, BigNumber.from(0x8da5cb5b));
+  });
+
+  it("should fail submission after request deadline", async function () {
+    await dioneOracle.requestOracles(1, "getTransaction", "bafy2bzaceaaab3kkoaocal2dzh3okzy4gscqpdt42hzrov3df6vjumalngc3g", dioneOracle.address, BigNumber.from(0x8da5cb5b));
+
+    await ethers.provider.send("evm_increaseTime", [301]);
+    await expect(dioneOracle.submitOracleRequest(1, BigNumber.from(0x8da5cb5b)))
+      .to.be.reverted;
+  });
+
+  it("should fail submission on invalid request id", async function () {
+    await expect(dioneOracle.submitOracleRequest(333, BigNumber.from(0x8da5cb5b)))
+      .to.be.revertedWith("this request is not pending");
+  });
+
+  it("should fail cancel of request with invalid request id", async function () {
+    await expect(dioneOracle.cancelOracleRequest(333))
+      .to.be.revertedWith("this request is not pending");
   });
 });
\ No newline at end of file