First unit test case using HttpUnit

test/src/net/sourceforge/plantuml/servlet/TestForm.java

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+package net.sourceforge.plantuml.servlet;
+
+import junit.framework.*;
+import com.meterware.httpunit.*;
+
+public class TestForm extends TestCase {
+	
+	/**
+	 * Verifies that the welcome page has exactly two form
+	 * with the Bob --> Alice sample
+	 */
+    public void testWelcomePage() throws Exception {
+        WebConversation     conversation = new WebConversation();
+	    WebRequest request = new GetMethodWebRequest( "http://localhost/plantuml/" );
+	    WebResponse response = tryGetResponse(conversation, request );
+	      
+	    WebForm forms[] = response.getForms();
+	    assertEquals( 2, forms.length );
+        assertEquals( "url", forms[1].getParameterNames()[0] );
+        FormControl urlInput = forms[1].getParameter("url").getControl();
+        assertEquals( "http://localhost:80/plantuml/img/SyfFKj2rKt3CoKnELR1Io4ZDoSa70000", 
+                      forms[1].getParameterValue("url"));
+        assertEquals( "INPUT", urlInput.getTagName());
+        // Ensure the generated image is present
+        assertEquals( 1, response.getImages().length);
+
+	}
+
+    /**
+     * Verifies that when the UML text is empty, no image is generated
+     */
+    public void testEmptyText() throws Exception {
+        WebConversation     conversation = new WebConversation();
+        // Fill the form and submit it
+        WebRequest request = new GetMethodWebRequest( "http://localhost/plantuml/form" );
+        WebResponse response = tryGetResponse(conversation, request );
+        WebForm formUMLText = response.getForms()[0];
+        formUMLText.setParameter("text", "");
+        response = tryGetResponse( conversation, formUMLText.getRequest());
+        // Analyze response
+        WebForm forms[] = response.getForms();
+        assertEquals( 2, forms.length );
+        // Ensure the Text field is empty
+        assertNull( forms[0].getParameterValue("text"));
+        // Ensure the URL field is empty
+        assertTrue( forms[1].getParameterValue("url").isEmpty());
+        // Ensure there is no image
+        assertEquals( 0, response.getImages().length);
+    }
+        
+    /**
+     * try getting a response for the given Conversation and Request
+     * show an error message if a 404 error appears
+     * @param conversation - the conversation to use
+     * @param request
+     * @return the response
+     * @throws an Exception if getting the response fails
+     */
+    public WebResponse tryGetResponse(WebConversation conversation, WebRequest request) throws Exception {
+        WebResponse response=null;
+        try {
+            response = conversation.getResponse( request );
+        } catch (HttpNotFoundException nfe) {
+            System.err.println("The URL '"+request.getURL()+"' is not active any more");
+            throw nfe;
+        }
+        return response;
+    }
+
+}