diff --git a/.gitignore b/.gitignore
index 0692de6..529fadc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@ data/*
 node_modules/*
 *.json
 bin/*
-build/*
\ No newline at end of file
+build/*
+!package*.json
\ No newline at end of file
diff --git a/contracts/HelloEthSalon.sol b/contracts/HelloEthSalon.sol
index 8292d63..682fb8c 100644
--- a/contracts/HelloEthSalon.sol
+++ b/contracts/HelloEthSalon.sol
@@ -3,11 +3,16 @@ pragma solidity ^0.4.4;
 contract HelloEthSalon {
     string message = "I know smart contract testing!!";
 
-    function HelloEthSalon() {
+    function HelloEthSalon() public {
         // constructor
     }
 
-    function GetMessage() returns (string) {
+    function SetMessage(string m) public {
+        require(bytes(m).length > 0);
+        message = m;
+    }
+
+    function GetMessage() public returns (string) {
         return message;
     }
 }
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..1cbaf96
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,5805 @@
+{
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+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-2.0.2.tgz",
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+      "dev": true,
+      "requires": {
+        "camelcase": "3.0.0",
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+    },
+    "yauzl": {
+      "version": "2.9.1",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.9.1.tgz",
+      "integrity": "sha1-qBmB6nCleUYTOIPwKcWCGok1mn8=",
+      "dev": true,
+      "requires": {
+        "buffer-crc32": "0.2.13",
+        "fd-slicer": "1.0.1"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..f201a52
--- /dev/null
+++ b/package.json
@@ -0,0 +1,31 @@
+{
+  "name": "eth_projet",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start_rpc": "testrpc",
+    "start_test": "npm run clean && truffle compile && truffle migrate && truffle test",
+    "test": "concurrently --names 'RPC,TEST' --kill-others \"npm run start_rpc\" \"npm run start_test\" || true",
+    "clean": "rm -rf build"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@gitlab.com/MrDev023/ETH_PROJET.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://gitlab.com/MrDev023/ETH_PROJET/issues"
+  },
+  "homepage": "https://gitlab.com/MrDev023/ETH_PROJET#README",
+  "devDependencies": {
+    "concurrently": "^3.5.1",
+    "ethereumjs-testrpc": "^6.0.3",
+    "fs": "0.0.1-security",
+    "geth": "^0.4.0",
+    "solc": "^0.4.19",
+    "truffle": "^4.0.6",
+    "web3": "^1.0.0-beta.29"
+  }
+}
diff --git a/test/hello_eth_salon.js b/test/hello_eth_salon.js
index 2549e34..0ee60fd 100644
--- a/test/hello_eth_salon.js
+++ b/test/hello_eth_salon.js
@@ -6,4 +6,21 @@ contract("HelloEthSalon:GetMessage", function (accounts) {
     const result = await contract.GetMessage.call();
     assert.isTrue(result === "I know smart contract testing!!");
   });
+});
+
+contract("HelloEthSalon:SetMessage", function (accounts) {
+
+  it("should not set a empty string", async function () {
+    const contract = await HelloEthSalon.deployed();
+    var ret = false;
+    try{const result = await contract.SetMessage.call("");}catch (e){ret = true;}
+    assert.isTrue(ret);
+  });
+
+  it("should set to test", async function () {
+    const contract = await HelloEthSalon.deployed();
+    var ret = false;
+    try{const result = await contract.SetMessage.call("test");}catch (e){ret = true;} 
+    assert.isTrue(!ret,"Erreur de transaction"); // Pas d'erreur de transaction
+  });
 });
\ No newline at end of file