Add Unit Test

.gitignore

@@ -1,3 +1,5 @@
 data/*
 node_modules/*
-*.json
+*.json
+bin/*
+build/*

Test.eth

@@ -1,13 +0,0 @@
-pragma solidity ^0.4.18;
-
-contract Test {
-    int256 a = 0;
-    
-    function set(int256 n) public {
-        a += n;
-    }
-    
-    function get() public constant returns(int256) {
-        return a;
-    }
-}

contracts/HelloEthSalon.sol

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+pragma solidity ^0.4.4;
+
+contract HelloEthSalon {
+    string message = "I know smart contract testing!!";
+
+    function HelloEthSalon() {
+        // constructor
+    }
+
+    function GetMessage() returns (string) {
+        return message;
+    }
+}

migrations/1_initial_migration.js

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+var HelloEthSalon = artifacts.require('./HelloEthSalon.sol');
+
+module.exports = function(deployer) {
+  deployer.deploy(HelloEthSalon);
+};

test/hello_eth_salon.js

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+var HelloEthSalon = artifacts.require("./HelloEthSalon.sol");
+
+contract("HelloEthSalon:GetMessage", function (accounts) {
+  it("should return a correct string", async function () {
+    const contract = await HelloEthSalon.deployed();
+    const result = await contract.GetMessage.call();
+    assert.isTrue(result === "I know smart contract testing!!");
+  });
+});

truffle-config.js

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+module.exports = {
+    // See <http://truffleframework.com/docs/advanced/configuration>
+    // to customize your Truffle configuration!
+};

truffle.js

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+module.exports = {
+    networks: {
+        development: {
+            host: "localhost",
+            port: 8545,
+            network_id: "*", // Match any network id
+            gas: 4700000
+        }
+    }
+};