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
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
# -*- encoding: utf-8 -*-
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
ruby_version_is "1.9" do
describe "StringIO#ungetbyte" do
before :each do
@io = StringIO.new("abcdef")
end
it "returns nil" do
@io.ungetbyte(65).should be_nil
end
it "returns nil and does not modify data if passed nil" do
@io.read(2).should == "ab"
@io.ungetbyte(nil).should be_nil
@io.rewind
@io.read.should == "abcdef"
end
it "prepends the byte to the data before data is read" do
@io.ungetbyte(65)
@io.read(2).should == "Aa"
end
it "preserves the prepended bytes when #rewind is called" do
@io.ungetbyte(65)
@io.ungetbyte(66)
@io.rewind
@io.read.should == "BAabcdef"
end
it "prepends byte to the data at the current position" do
@io.read(3).should == "abc"
@io.ungetbyte(65)
@io.read(2).should == "Ad"
end
it "overwrites bytes in the data" do
@io.read(3).should == "abc"
@io.ungetbyte(66)
@io.ungetbyte(65)
@io.rewind
@io.read.should == "aABdef"
end
it "prepends a string to data before data is read" do
@io.ungetbyte("ghi")
@io.read.should == "ghiabcdef"
end
it "prepends a string at the current position" do
@io.read(2).should == "ab"
@io.ungetbyte("dceb")
@io.read.should == "dcebcdef"
end
it "calls #to_str to convert an object to a String" do
bytes = mock("stringio ungetbyte")
bytes.should_receive(:to_str).and_return("xyz")
@io.read(3).should == "abc"
@io.ungetbyte(bytes).should be_nil
@io.rewind
@io.read.should == "xyzdef"
end
it "raises an IOError when the mode is not readable" do
lambda { StringIO.new("", "w").ungetbyte(42) }.should raise_error(IOError)
end
it "raises an IOError when read is closed" do
@io.read
@io.close_read
lambda { @io.ungetbyte(42) }.should raise_error(IOError)
end
with_feature :encoding do
it "does not change the encoding of the data" do
@io.ungetbyte(0xff)
result = @io.read
result.should == "\xffabcdef"
result.encoding.should == Encoding::UTF_8
end
end
end
end
|
