diff --git a/Assignment #4 b/Assignment #4
index d895f9d03..76adecc98 100644
--- a/Assignment #4	
+++ b/Assignment #4	
@@ -1,26 +1,41 @@
-pragma solidity ^0.4.14;
-
-import "truffle/Assert.sol";
-import "truffle/DeployedAddresses.sol";
-import "../contracts/payroll.sol";
-
-contract TestPayroll {
-
-  function testTotalSalary() public {
-    payroll payrolltest = payroll(DeployedAddresses.payroll());
-
-    address employeeId = 0x14723a09acff6d2a60dcdf7aa4aff308fddc160c;
-  
-    payrolltest.addEmployee(employeeId,1);
-
-    Assert.equal(employees[employeeId].id, employeeId, "The employee has been added.");
-    uint expectedSalary1 = 1 ether;
-    Assert.equal(totalSalary, expectedSalary1, "It should store the value 1.");
-
-    payrolltest.removeEmployee(employeeId);
-
-    Assert.equal(employees[employeeId].id, "0x0", "The employee has been removed.");
-    uint expectedSalary2 = 0 ether;
-    Assert.equal(totalSalary, expectedSalary2, "It should store the value 0.");
-  }
+var Payroll = artifacts.require("./Payroll.sol");
+
+contract('Payroll', function(accounts) {
+
+    it("...should add/remove employee.", function() {
+        return Payroll.deployed().then(function(instance) {
+            payrollInstance = instance;
+    
+            return payrollInstance.addEmployee(accounts[1], 1,{from: accounts[0]});
+        }).then(function() {
+            return payrollInstance.removeEmployee(accounts[1]);
+        }).then(function() {
+            assert(true, "pass");
+        })
+    });
+
+    it("...should add valid address.", function() {
+        return Payroll.deployed().then(function(instance) {
+            payrollInstance = instance;
+    
+            return payrollInstance.addEmployee("0x0", 1,{from: accounts[0]});
+        }).catch(function(error) {
+            assert(error.toString().includes('invalid opcode'), "expect exception here");
+    
+        });
+    });
+
+    it("...should add employee only once.", function() {
+        return Payroll.deployed().then(function(instance) {
+            payrollInstance = instance;
+    
+            return payrollInstance.addEmployee(accounts[1], 1,{from: accounts[0]});
+        }).then(function() {
+            return payrollInstance.addEmployee(accounts[1], 1,{from: accounts[0]});
+        }).catch(function(error) {
+            assert(error.toString().includes('invalid opcode'), "expect exception here");
+    
+        });
+    });
+});
 
diff --git a/Assignment #6.zip b/Assignment #6.zip
new file mode 100644
index 000000000..adddedab7
Binary files /dev/null and b/Assignment #6.zip differ
diff --git a/Lesson5/orgin/src/components/Employee.js b/Lesson5/orgin/src/components/Employee.js
index 56daca687..73f9b7e6d 100644
--- a/Lesson5/orgin/src/components/Employee.js
+++ b/Lesson5/orgin/src/components/Employee.js
@@ -14,17 +14,21 @@ class Employer extends Component {
   }
 
  checkEmployee = () => {
-      const{payroll,employee,web3} = this.props;
-      payroll.employees.call(employee,{
-          from:employee,
-          gas:1000000
+      const{payroll,account,web3} = this.props;
+      payroll.employees.call(account,{
+          from:account,
       }).then((result)=>{
-          console.log(result)
           this.setState({
               salary:web3.fromWei(result[1].toNumber()),
-              lastPaidDate: new Date(result[2].toNumber()*1000)
+              lastPaidDate: new Date(result[2].toNumber()*1000).toString()
           });
       });
+
+      web3.eth.getBalance(account,(err,result) =>{
+        this.setState({
+          balance:web3.fromWei(result.toNumber())
+        });
+      });
   }
 
   getPaid = () => {