CVS: junit/src/org/junit/internal/requests ClassRequest.java, 1.3, 1.4

Update of /cvsroot/junit/junit/src/org/junit/internal/requests
In directory sc8-pr-cvs6.sourceforge.net:/tmp/cvs-serv11377/src/org/junit/internal/requests

Modified Files:
	ClassRequest.java 
Log Message:
Better error message when a custom runner has a wrongly-signatured constructor

Index: ClassRequest.java
===================================================================
RCS file: /cvsroot/junit/junit/src/org/junit/internal/requests/ClassRequest.java,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -d -r1.3 -r1.4
--- ClassRequest.java	24 Jan 2007 16:32:59 -0000	1.3
+++ ClassRequest.java	21 Feb 2007 17:12:37 -0000	1.4
@@ -1,8 +1,7 @@
 package org.junit.internal.requests;
 
-import java.lang.reflect.Constructor;
-
 import org.junit.Ignore;
+import org.junit.internal.runners.InitializationError;
 import org.junit.internal.runners.OldTestClassRunner;
 import org.junit.internal.runners.TestClassRunner;
 import org.junit.runner.Request;
@@ -11,6 +10,7 @@
 import org.junit.runners.AllTests;
 
 public class ClassRequest extends Request {
+	private static final String CONSTRUCTOR_ERROR_FORMAT= "Custom runner class %s should have a public constructor with signature %s(Class testClass)";
 	private final Class<?> fTestClass;
 	private boolean fCanUseSuiteMethod;
 
@@ -25,15 +25,20 @@
 	
 	@Override
 	public Runner getRunner() {
-		Class<? extends Runner> runnerClass= getRunnerClass(fTestClass);
+		return buildRunner(getRunnerClass(fTestClass)); 
+	}
+
+	public Runner buildRunner(Class<? extends Runner> runnerClass) {
 		try {
-			Constructor<? extends Runner> constructor= runnerClass.getConstructor(Class.class); // TODO good error message if no such constructor
-			return constructor.newInstance(new Object[] { fTestClass });
-		} catch (StackOverflowError e) {
-			throw new RuntimeException();
+			return runnerClass.getConstructor(Class.class).newInstance(new Object[] { fTestClass });
+		} catch (NoSuchMethodException e) {
+			String simpleName= runnerClass.getSimpleName();
+			InitializationError error= new InitializationError(String.format(
+					CONSTRUCTOR_ERROR_FORMAT, simpleName, simpleName));
+			return Request.errorReport(fTestClass, error).getRunner();
 		} catch (Exception e) {
 			return Request.errorReport(fTestClass, e).getRunner();
-		} 
+		}
 	}
 
 	Class<? extends Runner> getRunnerClass(final Class<?> testClass) {


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