assertTrue("Test if read is possible", buffer.available());
assertEquals("Test text", 'b', buffer.read());
char[] chars2 = "fghij".toCharArray();
buffer.push(chars2, 2, 3); // "hij"
assertEquals("Test text", 'c', buffer.read());
assertEquals("Test text", 'd', buffer.read());
assertEquals("Test text", 'h', buffer.read());
assertEquals("Test text", 'i', buffer.read());