47         testbuf<char> sb("abc");  in main()  local
48         assert(sb.sputc('1') == '1');  in main()
49         assert(sb.str() == "1bc");  in main()
50         assert(sb.sputc('2') == '2');  in main()
51         assert(sb.str() == "12c");  in main()
52         assert(sb.sputc('3') == '3');  in main()
53         assert(sb.str() == "123");  in main()
54         assert(sb.sputc('4') == '4');  in main()
55         assert(sb.str() == "1234");  in main()
56         assert(sb.sputc('5') == '5');  in main()
57         assert(sb.str() == "12345");  in main()
58         assert(sb.sputc('6') == '6');  in main()
59         assert(sb.str() == "123456");  in main()
60         assert(sb.sputc('7') == '7');  in main()
61         assert(sb.str() == "1234567");  in main()
62         assert(sb.sputc('8') == '8');  in main()
63         assert(sb.str() == "12345678");  in main()
64         assert(sb.sputc('9') == '9');  in main()
65         assert(sb.str() == "123456789");  in main()
66         assert(sb.sputc('0') == '0');  in main()
67         assert(sb.str() == "1234567890");  in main()
68         assert(sb.sputc('1') == '1');  in main()
69         assert(sb.str() == "12345678901");  in main()
73         testbuf<wchar_t> sb(L"abc");  in main()  local
74         assert(sb.sputc(L'1') == L'1');  in main()
75         assert(sb.str() == L"1bc");  in main()
76         assert(sb.sputc(L'2') == L'2');  in main()
77         assert(sb.str() == L"12c");  in main()
78         assert(sb.sputc(L'3') == L'3');  in main()
79         assert(sb.str() == L"123");  in main()
80         assert(sb.sputc(L'4') == L'4');  in main()
81         assert(sb.str() == L"1234");  in main()
82         assert(sb.sputc(L'5') == L'5');  in main()
83         assert(sb.str() == L"12345");  in main()
84         assert(sb.sputc(L'6') == L'6');  in main()
85         assert(sb.str() == L"123456");  in main()
86         assert(sb.sputc(L'7') == L'7');  in main()
87         assert(sb.str() == L"1234567");  in main()
88         assert(sb.sputc(L'8') == L'8');  in main()
89         assert(sb.str() == L"12345678");  in main()
90         assert(sb.sputc(L'9') == L'9');  in main()
91         assert(sb.str() == L"123456789");  in main()
92         assert(sb.sputc(L'0') == L'0');  in main()
93         assert(sb.str() == L"1234567890");  in main()
94         assert(sb.sputc(L'1') == L'1');  in main()
95         assert(sb.str() == L"12345678901");  in main()
99         testbuf<char> sb("abc", std::ios_base::app | std::ios_base::out);  in main()  local
100         assert(sb.sputc('1') == '1');  in main()
101         assert(sb.str() == "abc1");  in main()
102         assert(sb.sputc('2') == '2');  in main()
103         assert(sb.str() == "abc12");  in main()