COMPRESS-514: test when using default maxpagesize

Author: akelday

src/test/java/org/apache/commons/compress/archivers/sevenz/HeaderChannelBufferTest.java

@@ -42,6 +42,13 @@ public void testPagedArrayTransfer() throws Exception {
         assertArrayEquals(data, output);
     }
 
+    @Test
+    public void testNoMaxPageSize() throws Exception {
+        SeekableInMemoryByteChannel channel = new SeekableInMemoryByteChannel(new byte[50]);
+        HeaderBuffer headerBuffer = HeaderChannelBuffer.create(channel, 50);
+        assertTrue(headerBuffer.hasCRC());
+    }
+
     @Test
     public void testGetElementsFromPagedChannel() throws Exception {
         byte[] data = {(byte) 255, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 5, 6, 7, 8};