Test that EclipseHelper does not serialize default values

The switch to reading annotations directly from .class files in the
EclipseHelper fixed a subtle bug: default values for annotation
parameters must not be serialized into the annotation index, but instead
be inferred at runtime (in case the default values in the annotation
class itself changed).

Keep this bug fixed by testing for it in the unit tests.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

src/test/java/org/scijava/annotations/DirectoryIndexerTest.java

@@ -37,7 +37,9 @@
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assume.assumeTrue;
 
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileReader;
 import java.io.IOException;
 import java.lang.annotation.Annotation;
 import java.net.URL;
@@ -91,6 +93,16 @@ public void testIndexer() throws Exception {
 			readIndex(Complex.class, DirectoryIndexerTest.class.getClassLoader());
 
 		testDefaultAnnotations(map);
+
+		// verify that default values are not written to the serialized annotation index
+		final File complex = new File(jsonDirectory, Complex.class.getName());
+		final BufferedReader reader = new BufferedReader(new FileReader(complex));
+		for (;;) {
+			final String line = reader.readLine();
+			if (line == null) break;
+			assertTrue("Contains default value 'Q' for char0: " + line, line.indexOf('Q') < 0);
+		}
+		reader.close();
 	}
 
 	@Test