Add a horrible unit test for StreamUtils.

test/com/dmdirc/util/io/StreamUtilsTest.java

 
 import java.io.Closeable;
 import java.io.IOException;
+import java.io.InputStream;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
 
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Mockito.atLeastOnce;
 import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 
 @SuppressWarnings("resource")
         StreamUtils.close(null);
     }
 
+    @Test
+    public void testReadStream() throws Exception {
+        final InputStream inputStream = spy(getClass().getResource("test5.txt").openStream());
+        StreamUtils.readStream(inputStream);
+        verify(inputStream, atLeastOnce()).read(any(byte[].class), anyInt(), anyInt());
+    }
+
     @Test
     public void testCloseWithIoException() throws IOException {
         doThrow(new IOException("Oops")).when(closeable).close();