[英]JUnit using Mockito for Servlet Test Case
我嘗試針對JUnit測試用例對servlet進行基本模擬。 但是,我從這個特定的測試案例中獲得了0個代碼覆蓋率。 這是我的測試用例:
@Test
public void testServlet() throws ServletException, IOException {
HttpServletRequest request = mock(HttpServletRequest.class);
HttpServletResponse response = mock(HttpServletResponse.class);
DownloadServlet servlet = new DownloadServlet();
servlet.doGet(request, response);
assertEquals("text/html", response.getContentType());
}
我正在servlet中測試我的doGet方法,我非常確定唯一可測試的代碼是response.setContentType(“ text / html”)。 但是,我的測試用例什么也沒做。 這是我的DownloadServlet類:
package downloadsupport;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.ibm.ws.security.spnego.Context;
import downloadsupport.LogRead;
/**
* Servlet implementation class DownloadServlet
* @author Gabe
* @version 1.0
*/
@WebServlet("/DownloadServlet")
public class DownloadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public DownloadServlet() {
super();
}
private LogRead getInstance(){
return new LogRead();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Download Servlet Invoked");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
LogRead log = getInstance();
// Test if each log file in the folder is success or fail
for (String emailName : log.getEmails()) {
if (log.canReadLog(emailName)) {
System.out.println("Log Successful: " + emailName);
// Create HTML button to download a successful file
out.println("<div class='viewButton'>");
out.println("<form method='get' action=" + emailName +">"); // emailName is the file to download
out.println("<button type='submit' class='successButton'>"
+ "Success: " + emailName + "</button>");
out.println("</form>");
out.println("</div>");
}
else {
System.out.println("Log Failed: " + emailName);
// Create HTML button to download a failed file
out.println("<div class='viewButton'>");
out.println("<form method='get' action=" + emailName +">"); // emailName is the file to download
out.println("<button type='submit' class='failButton'>"
+ "Fail: " + emailName + "</button>");
out.println("</form>");
out.println("</div>");
}
}
out.println("<br>");
System.out.println(log.getEmails());
}
}
我懷疑您的測試由於NullPointerException而失敗,因為
response.getWriter();
將返回null。 除非您正確設置測試,否則Mockito模擬對象的所有訪問器都將返回null:
Mockito.when(response.getWriter()).thenReturn(aPrintWriterYouPreparedEarlier);
另外,根據log.getEmails()
返回的內容,您的代碼甚至可能不會進入循環。 如果發生這種情況,您將只執行5行,然后在最后一個out.println("<br>");
崩潰out.println("<br>");
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