Add CircularByteBufferTest.testAddByteSmallestBuffer()

Author: garydgregory

src/test/java/org/apache/commons/io/input/buffer/CircularByteBufferTest.java

@@ -28,6 +28,15 @@
  */
 public class CircularByteBufferTest {
 
+    @Test
+    public void testAddByteSmallestBuffer() {
+        final CircularByteBuffer cbb = new CircularByteBuffer(1);
+        cbb.add((byte) 1);
+        assertEquals(1, cbb.read());
+        cbb.add((byte) 2);
+        assertEquals(2, cbb.read());
+    }
+
     @Test
     public void testAddInvalidOffset() {
         final CircularByteBuffer cbb = new CircularByteBuffer();