Add tests for serialization of Result.assumptionFailureCount.

src/main/java/org/junit/runner/Result.java

@@ -55,28 +55,28 @@ private Result(SerializedForm serializedForm) {
     }
 
     /**
-     * @return the number of tests run
+     * Returns the number of tests run
      */
     public int getRunCount() {
         return count.get();
     }
 
     /**
-     * @return the number of tests that failed during the run
+     * Returns the number of tests that failed during the run
      */
     public int getFailureCount() {
         return failures.size();
     }
 
     /**
-     * @return the number of milliseconds it took to run the entire suite to run
+     * Returns the number of milliseconds it took to run the entire suite to run
      */
     public long getRunTime() {
         return runTime.get();
     }
 
     /**
-     * @return the {@link Failure}s describing tests that failed and the problems they encountered
+     * Returns the {@link Failure}s describing tests that failed and the problems they encountered
      */
     public List<Failure> getFailures() {
         return failures;
@@ -90,9 +90,16 @@ public int getIgnoreCount() {
     }
 
     /**
-     * @return the number of tests skipped because of an assumption failure
+     * Returns the number of tests skipped because of an assumption failure
+     *
+     * @throws UnsupportedOperationException if the result was serialized in a version before JUnit 4.13
+     * @since 4.13
      */
     public int getAssumptionFailureCount() {
+        if (assumptionFailureCount == null) {
+            throw new UnsupportedOperationException(
+                    "Result was serialized from a version of JUnit that doesn't support this method");
+        }
         return assumptionFailureCount.get();
     }
 
@@ -197,6 +204,7 @@ public void serialize(ObjectOutputStream s) throws IOException {
             fields.put("fFailures", fFailures);
             fields.put("fRunTime", fRunTime);
             fields.put("fStartTime", fStartTime);
+            fields.put("assumptionFailureCount", assumptionFailureCount);
             s.writeFields();
         }
 

src/test/java/junit/tests/runner/ResultTest.java

@@ -2,6 +2,8 @@
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.ObjectInputStream;
@@ -10,25 +12,69 @@
 
 import junit.framework.TestCase;
 import junit.tests.framework.Success;
+import org.junit.Test;
 import org.junit.runner.JUnitCore;
 import org.junit.runner.Result;
 import org.junit.runner.notification.Failure;
 import org.junit.tests.running.methods.AnnotationTest;
 
 public class ResultTest extends TestCase {
 
+    private Result fromStream;
+
     public void testRunFailureResultCanBeSerialised() throws Exception {
         JUnitCore runner = new JUnitCore();
         Result result = runner.run(AnnotationTest.FailureTest.class);
         assertResultSerializable(result);
     }
 
+    public void testRunFailureResultCanBeReserialised_v4_12() throws Exception {
+        JUnitCore runner = new JUnitCore();
+        Result result = runner.run(AnnotationTest.FailureTest.class);
+        assertResultReserializable(result, SerializationFormat.V4_12);
+    }
+
+    public void testRunAssumptionFailedResultCanBeSerialised() throws Exception {
+        JUnitCore runner = new JUnitCore();
+        Result result = runner.run(AssumptionFailedTest.class);
+        assertResultSerializable(result);
+    }
+
+    public void testRunAssumptionFailedResultCanBeReserialised_v4_12() throws Exception {
+        JUnitCore runner = new JUnitCore();
+        Result result = runner.run(AssumptionFailedTest.class);
+        assertResultReserializable(result, SerializationFormat.V4_12);
+    }
+
+    public void testRunAssumptionFailedResultCanBeReserialised_v4_13() throws Exception {
+        JUnitCore runner = new JUnitCore();
+        Result result = runner.run(AssumptionFailedTest.class);
+        assertResultReserializable(result, SerializationFormat.V4_13);
+    }
+
     public void testRunSuccessResultCanBeSerialised() throws Exception {
         JUnitCore runner = new JUnitCore();
         Result result = runner.run(Success.class);
         assertResultSerializable(result);
     }
 
+    public void testRunSuccessResultCanBeReserialised_v4_12() throws Exception {
+        JUnitCore runner = new JUnitCore();
+        Result result = runner.run(Success.class);
+        assertResultReserializable(result, SerializationFormat.V4_12);
+    }
+
+    public void testRunSuccessResultCanBeReserialised_v4_13() throws Exception {
+        JUnitCore runner = new JUnitCore();
+        Result result = runner.run(Success.class);
+        assertResultReserializable(result, SerializationFormat.V4_13);
+    }
+
+    private enum SerializationFormat {
+        V4_12,
+        V4_13
+    }
+
     private void assertResultSerializable(Result result) throws IOException, ClassNotFoundException {
         ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
         ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
@@ -37,14 +83,26 @@ private void assertResultSerializable(Result result) throws IOException, ClassNo
         byte[] bytes = byteArrayOutputStream.toByteArray();
         ObjectInputStream objectInputStream = new ObjectInputStream(new ByteArrayInputStream(bytes));
         Result fromStream = (Result) objectInputStream.readObject();
-        assertSerializedCorrectly(result, fromStream);
-
-        InputStream resource = getClass().getResourceAsStream(getName());
-        assertNotNull("Could not read resource " + getName(), resource);
-        objectInputStream = new ObjectInputStream(resource);
+        assertSerializedCorrectly(result, fromStream, SerializationFormat.V4_13);
+    }
+
+    private void assertResultReserializable(Result result, SerializationFormat resourceSerializationFormat)
+            throws IOException, ClassNotFoundException {
+        String resourceName = getName();
+        InputStream resource = getClass().getResourceAsStream(resourceName);
+        assertNotNull("Could not read resource " + resourceName, resource);
+        ObjectInputStream objectInputStream = new ObjectInputStream(resource);
         fromStream = (Result) objectInputStream.readObject();
-
-        assertSerializedCorrectly(new ResultWithFixedRunTime(result), fromStream);
+
+        assertSerializedCorrectly(new ResultWithFixedRunTime(result),
+                fromStream, resourceSerializationFormat);
+    }
+
+    static public class AssumptionFailedTest {
+        @Test
+        public void assumptionFailed() throws Exception {
+            org.junit.Assume.assumeTrue(false);
+        }
     }
 
     /**
@@ -85,14 +143,35 @@ public List<Failure> getFailures() {
         public int getIgnoreCount() {
             return delegate.getIgnoreCount();
         }
+
+        @Override
+        public int getAssumptionFailureCount() {
+            return delegate.getAssumptionFailureCount();
+        }
     }
 
-    private void assertSerializedCorrectly(Result result, Result fromStream) {
+    private void assertSerializedCorrectly(
+            Result result, Result fromStream, SerializationFormat serializationFormat) {
         assertNotNull(fromStream);
 
         // Exceptions don't implement equals() so we need to compare field by field
         assertEquals("failureCount", result.getFailureCount(), fromStream.getFailureCount());
         assertEquals("ignoreCount", result.getIgnoreCount(), fromStream.getIgnoreCount());
+
+        if (serializationFormat == SerializationFormat.V4_13) {
+            // assumption failures are serialized
+            assertEquals("assumptionFailureCount",
+                    result.getAssumptionFailureCount(),
+                    fromStream.getAssumptionFailureCount());
+        } else {
+            // assumption failures were not serialized
+            try {
+                fromStream.getAssumptionFailureCount();
+                fail("UnsupportedOperationException expected");
+            } catch (UnsupportedOperationException expected) {
+            }
+        }
+
         assertEquals("runTime", result.getRunTime(), fromStream.getRunTime());
         assertEquals("failures", result.getFailures().size(), fromStream.getFailures().size());
         int index = 0;