1 files changed, 55 insertions, 47 deletions

diff --git a/src/main/java/org/junit/internal/runners/ErrorReportingRunner.java b/src/main/java/org/junit/internal/runners/ErrorReportingRunner.java
index 200b6f0..1d32beb 100644
--- a/src/main/java/org/junit/internal/runners/ErrorReportingRunner.java
+++ b/src/main/java/org/junit/internal/runners/ErrorReportingRunner.java
@@ -11,50 +11,58 @@ import org.junit.runner.notification.RunNotifier;
 import org.junit.runners.model.InitializationError;
 
 public class ErrorReportingRunner extends Runner {
-	private final List<Throwable> fCauses;
-
-	private final Class<?> fTestClass;
-
-	public ErrorReportingRunner(Class<?> testClass, Throwable cause) {
-		fTestClass= testClass;
-		fCauses= getCauses(cause);
-	}
-
-	@Override
-	public Description getDescription() {
-		Description description= Description.createSuiteDescription(fTestClass);
-		for (Throwable each : fCauses)
-			description.addChild(describeCause(each));
-		return description;
-	}
-
-	@Override
-	public void run(RunNotifier notifier) {
-		for (Throwable each : fCauses)
-			runCause(each, notifier);
-	}
-
-	@SuppressWarnings("deprecation")
-	private List<Throwable> getCauses(Throwable cause) {
-		if (cause instanceof InvocationTargetException)
-			return getCauses(cause.getCause());
-		if (cause instanceof InitializationError)
-			return ((InitializationError) cause).getCauses();
-		if (cause instanceof org.junit.internal.runners.InitializationError)
-			return ((org.junit.internal.runners.InitializationError) cause)
-					.getCauses();
-		return Arrays.asList(cause);
-	}
-
-	private Description describeCause(Throwable child) {
-		return Description.createTestDescription(fTestClass,
-				"initializationError");
-	}
-
-	private void runCause(Throwable child, RunNotifier notifier) {
-		Description description= describeCause(child);
-		notifier.fireTestStarted(description);
-		notifier.fireTestFailure(new Failure(description, child));
-		notifier.fireTestFinished(description);
-	}
-}
\ No newline at end of file
+    private final List<Throwable> causes;
+
+    private final Class<?> testClass;
+
+    public ErrorReportingRunner(Class<?> testClass, Throwable cause) {
+        if (testClass == null) {
+            throw new NullPointerException("Test class cannot be null");
+        }
+        this.testClass = testClass;
+        causes = getCauses(cause);
+    }
+
+    @Override
+    public Description getDescription() {
+        Description description = Description.createSuiteDescription(testClass);
+        for (Throwable each : causes) {
+            description.addChild(describeCause(each));
+        }
+        return description;
+    }
+
+    @Override
+    public void run(RunNotifier notifier) {
+        for (Throwable each : causes) {
+            runCause(each, notifier);
+        }
+    }
+
+    @SuppressWarnings("deprecation")
+    private List<Throwable> getCauses(Throwable cause) {
+        if (cause instanceof InvocationTargetException) {
+            return getCauses(cause.getCause());
+        }
+        if (cause instanceof InitializationError) {
+            return ((InitializationError) cause).getCauses();
+        }
+        if (cause instanceof org.junit.internal.runners.InitializationError) {
+            return ((org.junit.internal.runners.InitializationError) cause)
+                    .getCauses();
+        }
+        return Arrays.asList(cause);
+    }
+
+    private Description describeCause(Throwable child) {
+        return Description.createTestDescription(testClass,
+                "initializationError");
+    }
+
+    private void runCause(Throwable child, RunNotifier notifier) {
+        Description description = describeCause(child);
+        notifier.fireTestStarted(description);
+        notifier.fireTestFailure(new Failure(description, child));
+        notifier.fireTestFinished(description);
+    }
+}