Add a test for the EclipseHelper avoiding to write META-INF/json/

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

Author: dscho

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

@@ -52,6 +52,20 @@
  */
 public class EclipseHelperTest {
 
+	@Test
+	public void testSkipIndexGeneration() throws Exception {
+		final File dir = createTempDirectory();
+		copyClasses(dir, Complex.class, Simple.class);
+		final File jsonDir = new File(dir, Index.INDEX_PREFIX);
+		assertFalse(jsonDir.exists());
+		final URLClassLoader loader =
+			new URLClassLoader(new URL[] { dir.toURI().toURL() }, getClass()
+				.getClassLoader().getParent());
+		EclipseHelper.indexed.clear();
+		EclipseHelper.updateAnnotationIndex(loader);
+		assertFalse(jsonDir.exists());
+	}
+
 	@Test
 	public void testIndexing() throws Exception {
 		final File dir = createTempDirectory();