SessionInputBufferMockup inbuffer = new SessionInputBufferMockup(
outbuffer.getData());
assertEquals("a", inbuffer.readLine());
assertEquals("", inbuffer.readLine());
assertEquals("\r", inbuffer.readLine());
assertEquals("", inbuffer.readLine());
assertEquals(s1, inbuffer.readLine());
assertEquals(s2, inbuffer.readLine());
assertEquals(s3, inbuffer.readLine());
assertEquals("a", inbuffer.readLine());