怎么才算让自己感到安全？覆盖逻辑，而不是代码。站在使用者的角度考虑，需要关心的是软件实现逻辑，而不是覆盖率。如下面的例子：
public class UserBusiness
{
public string CreateUser(User user)
{
string result = "success";
if (string.IsNullOrEmpty(user.Username))
{
result = "usename is null or empty";
}
else if (string.IsNullOrEmpty(user.Password))
{
result = "password is null or empty";
}
else if (user.Password != user.ConfirmPassword)
{
result = "password is not equal to confirmPassword";
}
else if (string.IsNullOrEmpty(user.Creator))
{
result = "creator is null or empty";
}
else if (user.CreateDate == new DateTime())
{
result = "createdate must be assigned value";
}
else if (string.IsNullOrEmpty(user.CreatorIP))
{
result = "creatorIP is null or empty";
}
if (result != "success")
{
return result;
}
user.Username = user.Username.Trim();
user.Password = BitConverter.ToString(MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(user.Password)));
UserDataAccess dataAccess = new UserDataAccess();
dataAccess.CreateUser(user);
return result;
}
}
在写UserBusiness.CreateUser的测试用例的时候，我们定义了下面几个单元测试用例：
[TestClass()]
public class UserBusinessTest
{
private TestContext testContextInstance;
/// <summary>
///Gets or sets the test context which provides
///information about and functionality for the current test run.
///</summary>
public TestContext TestContext
{
get
{
return testContextInstance;
}
set
{
testContextInstance = value;
}
}
[TestMethod()]
public void Should_Username_Not_Null_Or_Empty()
{
UserBusiness target = new UserBusiness();
User user = new User();
string expected = "usename is null or empty";
string actual = target.CreateUser(user);
Assert.AreEqual(expected， actual);
}
[TestMethod()]
public void Should_Password_Not_Null_Or_Empty()
{
UserBusiness target = new UserBusiness();
User user = new User()
{
Username = "ethan.cai"
};
string expected = "password is null or empty";
string actual = target.CreateUser(user);
Assert.AreEqual(expected， actual);
}