Add test for handling InitializationError

The code was changed by commit 0804ef4
but unfortunately the test was not part of the commit. The test is based
on Philip Graf's test in pull request junit-team#1065.

Co-authored-by: Philip Graf <[email protected]>

src/test/java/org/junit/rules/EventCollector.java

@@ -13,7 +13,7 @@
 import org.junit.runner.notification.Failure;
 import org.junit.runner.notification.RunListener;
 
-class EventCollector extends RunListener {
+public class EventCollector extends RunListener {
     static Matcher<EventCollector> everyTestRunSuccessful() {
         return allOf(hasNoFailure(), hasNoAssumptionFailure());
     }
@@ -73,7 +73,7 @@ static Matcher<EventCollector> hasNoAssumptionFailure() {
         return hasNumberOfAssumptionFailures(0);
     }
 
-    static Matcher<EventCollector> hasSingleFailureWithMessage(String message) {
+    public static Matcher<EventCollector> hasSingleFailureWithMessage(String message) {
         return hasSingleFailureWithMessage(equalTo(message));
     }
 

src/test/java/org/junit/runner/RequestTest.java

@@ -2,8 +2,12 @@
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.rules.EventCollector.hasSingleFailureWithMessage;
 
 import org.junit.Test;
+import org.junit.rules.EventCollector;
+import org.junit.runners.model.InitializationError;
+import org.junit.runners.model.RunnerBuilder;
 
 public class RequestTest {
 
@@ -18,4 +22,29 @@ public void createsADescriptionWithANameForClasses() {
                 .getDescription();
         assertThat(description.toString(), is("classes"));
     }
+
+    @Test
+    public void reportsInitializationErrorThrownWhileCreatingSuite() {
+        EventCollector collector = new EventCollector();
+        JUnitCore core = new JUnitCore();
+        core.addListener(collector);
+
+        core.run(new FailingComputer(), FooTest.class, BarTest.class);
+
+        assertThat(collector, hasSingleFailureWithMessage("cannot create suite"));
+    }
+
+    private static class FailingComputer extends Computer {
+        @Override
+        public Runner getSuite(RunnerBuilder builder, Class<?>[] classes)
+                throws InitializationError {
+            throw new InitializationError("cannot create suite");
+        }
+    }
+
+    private static class FooTest {
+    }
+
+    private static class BarTest {
+    }
 }