blob: eb1cc552204ae3cbb6f10b4e5e1a9e6ac18c7922 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
# frozen_string_literal: false
require_relative '../../spec_helper'
require 'stringio'
describe "StringIO#ungetbyte" do
it "ungets a single byte from a string starting with a single byte character" do
str = 'This is a simple string.'
io = StringIO.new("#{str}")
c = io.getc
c.should == 'T'
io.ungetbyte(83)
io.string.should == 'Shis is a simple string.'
end
it "ungets a single byte from a string in the middle of a multibyte characte" do
str = "\u01a9"
io = StringIO.new(str)
b = io.getbyte
b.should == 0xc6 # First byte of UTF-8 encoding of \u01a9
io.ungetbyte(0xce) # First byte of UTF-8 encoding of \u03a9
io.string.should == "\u03a9"
end
it "constrains the value of a numeric argument to a single byte" do
str = 'This is a simple string.'
io = StringIO.new("#{str}")
c = io.getc
c.should == 'T'
io.ungetbyte(83 | 0xff00)
io.string.should == 'Shis is a simple string.'
end
it "ungets the bytes of a string if given a string as an arugment" do
str = "\u01a9"
io = StringIO.new(str)
b = io.getbyte
b.should == 0xc6 # First byte of UTF-8 encoding of \u01a9
io.ungetbyte("\u01a9")
io.string.bytes.should == [198, 169, 169]
end
end
|
