2 Why We Need Model-Based Testing

18 Why We Need Model-Based Testing
}
}
// ... continued
public string Receive()
{
int nbytes = connectionSocket.Receive(receiveBuf);
string command =
System.Text.Encoding.ASCII.GetString(receiveBuf,0,nbytes);
return command; // command.Length = 0 means connection closed
}
public void Send(double datum)
{
string response = String.Format("{0:F1}", datum); //1 decimal digit
byte [] sendBuf = System.Text.Encoding.ASCII.GetBytes(response);
connectionSocket.Send(sendBuf);
}
public void CloseConnection()
{
connectionSocket.Close();
}
public void Close()
{
listenerSocket.Close();
}
Figure 2.4. Remote instrument server class (2).
In the .NET framework, a collection of code that is compiled together (in one csc
command) is called a source program. In this simple example, the source program
is a single class in a single file. Usually, the source program for a library comprises
several classes or other types in several files. Compiling a source program creates
a binary file called an assembly. Assemblies are the software components of the
.NET framework. A library is an assembly intended for use by applications (or
other libraries); it has no main method. A library has the file type dll.
We create another library for the server class. We create a third library for the
temperature sensor class, Temperature (Figure 2.6). This class provides a Sample
method that acquires one sample from the temperature sensor, and a ConvertToCelsius
method that converts a temperature sample from Fahrenheit to Celsius. This
version of Temperature is a simulator; it provides a stub Sample method that does
not require actual sensor hardware, so you can use it on any computer that provides
the .NET framework.
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