Test that the result is empty when nothing is processed (#543)

Test fails because it's a line break inserted although there was
no data processed.

metafacture-io/src/test/java/org/metafacture/io/ObjectFileWriterTest.java

@@ -19,6 +19,11 @@
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assume.assumeFalse;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.metafacture.commons.ResourceUtil;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -28,12 +33,6 @@
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 
-import org.junit.Before;
-import org.junit.Rule;
-import org.junit.Test;
-import org.junit.rules.TemporaryFolder;
-import org.metafacture.commons.ResourceUtil;
-
 /**
  * Tests for class {@link ObjectFileWriter}.
  *
@@ -105,6 +104,14 @@ public void shouldIncrementCountOnResetBeforeStartingNewFile() throws IOExceptio
         assertTrue(new File(tempFolder.getRoot(), "test-1").exists());
     }
 
+    @Test
+    public void issue543_shouldResultEmptyWhenNothingIsProcessed() throws IOException {
+        writer.process("");
+        writer.closeStream();
+
+        assertOutput( "");
+    }
+
     @Override
     protected ConfigurableObjectWriter<String> getWriter() {
         return writer;