checkStart(in, 1, 1);
assertEquals(2, in.getEndColumn());
assertEquals(1, in.getEndLine());
assertEquals("a\n", in.GetImage());
assertEquals("\n", new String(in.GetSuffix(1)));
in.AppendSuffix(buf.clear(), 1);
assertEquals("\n", buf.toString());
assertEquals("a\n", new String(in.GetSuffix(2)));
in.AppendSuffix(buf.clear(), 2);
assertEquals("a\n", buf.toString());