Coarse-grained testing with stubs - JUnit in Action - page 87

Figure 6.2 Adding a test case and replacing the real web resource with a stub

Let's look at a stub in action using the simple HTTP connection example. Listing 6.1
from the example application demonstrates a code snippet opening an HTTP connec-
tion to a given URL and reading the content found at that URL . Imagine the method is
one part of a bigger application that you want to unit test.

Listing 6.1 Sample method opening an HTTP connection

[...]
import java.net.URL;
import java.net.HttpURLConnection;
import java.io.InputStream;
import java.io.IOException;

public class WebClient {
public String getContent(URL url) {
StringBuffer content = new StringBuffer();
try {
HttpURLConnection connection = (HttpURLConnection)
url.openConnection();
connection.setDoInput( true );
InputStream is = connection.getInputStream();
byte [] buffer = new byte [2048];
int count;
while (-1 != (count = is.read(buffer))) {
content.append( new String(buffer, 0, count));
}
} catch (IOException e) {
return null ;
}

B

C

D