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v4 / vlib / strconv / write_dec_test.v
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1import strconv


2


3fn dec_to_string(n i64) string {


4    mut buf := []u8{len: 21, init: `x`}


5    written := strconv.write_dec(n, mut buf)


6    assert written >= 0


7    return buf[..written].bytestr()


8}


9


10fn dec_u_to_string(n u64) string {


11    mut buf := []u8{len: 20, init: `x`}


12    written := strconv.write_dec_u(n, mut buf)


13    assert written >= 0


14    return buf[..written].bytestr()


15}


16


17fn test_write_dec_signed_values() {


18    assert dec_to_string(0) == '0'


19    assert dec_to_string(1) == '1'


20    assert dec_to_string(-1) == '-1'


21    assert dec_to_string(1001) == '1001'


22    assert dec_to_string(-1001) == '-1001'


23    assert dec_to_string(1234567890) == '1234567890'


24    assert dec_to_string(-1234567890) == '-1234567890'


25    assert dec_to_string(max_i64) == '9223372036854775807'


26    assert dec_to_string(-9223372036854775807) == '-9223372036854775807'


27    assert dec_to_string(min_i64) == '-9223372036854775808'


28    assert dec_to_string('-9223372036854775808'.i64()) == '-9223372036854775808'


29}


30


31fn test_write_dec_unsigned_values() {


32    assert dec_u_to_string(0) == '0'


33    assert dec_u_to_string(1) == '1'


34    assert dec_u_to_string(1001) == '1001'


35    assert dec_u_to_string(1234567890) == '1234567890'


36    assert dec_u_to_string(u64(max_i64)) == '9223372036854775807'


37    assert dec_u_to_string(u64(max_i64) + 1) == '9223372036854775808'


38    assert dec_u_to_string(max_u64) == '18446744073709551615'


39}


40


41fn test_write_dec_returns_count_and_preserves_tail() {


42    mut buf := []u8{len: 8, init: `x`}


43    assert strconv.write_dec(42, mut buf) == 2


44    assert buf.bytestr() == '42xxxxxx'


45


46    buf = []u8{len: 8, init: `x`}


47    assert strconv.write_dec(-42, mut buf) == 3


48    assert buf.bytestr() == '-42xxxxx'


49


50    buf = []u8{len: 8, init: `x`}


51    assert strconv.write_dec_u(42, mut buf) == 2


52    assert buf.bytestr() == '42xxxxxx'


53}


54


55fn test_write_dec_returns_minus_one_for_small_buffer() {


56    mut buf := []u8{len: 2, init: `x`}


57    assert strconv.write_dec(123, mut buf) == -1


58    assert buf.bytestr() == 'xx'


59    assert strconv.write_dec(-12, mut buf) == -1


60    assert buf.bytestr() == 'xx'


61    assert strconv.write_dec_u(123, mut buf) == -1


62    assert buf.bytestr() == 'xx'


63


64    assert strconv.write_dec(-1, mut buf) == 2


65    assert buf.bytestr() == '-1'


66    assert strconv.write_dec_u(99, mut buf) == 2


67    assert buf.bytestr() == '99'


68}


69