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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
require_relative '../../spec_helper'
describe "File.truncate" do
before :each do
@name = tmp("test.txt")
touch(@name) { |f| f.write("1234567890") }
end
after :each do
rm_r @name
end
it "truncates a file" do
File.size(@name).should == 10
File.truncate(@name, 5)
File.size(@name).should == 5
File.open(@name, "r") do |f|
f.read(99).should == "12345"
f.should.eof?
end
end
it "truncate a file size to 0" do
File.truncate(@name, 0).should == 0
IO.read(@name).should == ""
end
it "truncate a file size to 5" do
File.size(@name).should == 10
File.truncate(@name, 5)
File.size(@name).should == 5
IO.read(@name).should == "12345"
end
it "truncates to a larger file size than the original file" do
File.truncate(@name, 12)
File.size(@name).should == 12
IO.read(@name).should == "1234567890\000\000"
end
it "truncates to the same size as the original file" do
File.truncate(@name, File.size(@name))
File.size(@name).should == 10
IO.read(@name).should == "1234567890"
end
it "raises an Errno::ENOENT if the file does not exist" do
# TODO: missing_file
not_existing_file = tmp("file-does-not-exist-for-sure.txt")
# make sure it doesn't exist for real
rm_r not_existing_file
begin
-> { File.truncate(not_existing_file, 5) }.should raise_error(Errno::ENOENT)
ensure
rm_r not_existing_file
end
end
it "raises an ArgumentError if not passed two arguments" do
-> { File.truncate }.should raise_error(ArgumentError)
-> { File.truncate(@name) }.should raise_error(ArgumentError)
end
platform_is_not :netbsd, :openbsd do
it "raises an Errno::EINVAL if the length argument is not valid" do
-> { File.truncate(@name, -1) }.should raise_error(Errno::EINVAL) # May fail
end
end
it "raises a TypeError if not passed a String type for the first argument" do
-> { File.truncate(1, 1) }.should raise_error(TypeError)
end
it "raises a TypeError if not passed an Integer type for the second argument" do
-> { File.truncate(@name, nil) }.should raise_error(TypeError)
end
it "accepts an object that has a #to_path method" do
File.truncate(mock_to_path(@name), 0).should == 0
end
end
describe "File#truncate" do
before :each do
@name = tmp("test.txt")
@file = File.open @name, 'w'
@file.write "1234567890"
@file.flush
end
after :each do
@file.close unless @file.closed?
rm_r @name
end
it "does not move the file write pointer to the specified byte offset" do
@file.truncate(3)
@file.write "abc"
@file.close
File.read(@name).should == "123\x00\x00\x00\x00\x00\x00\x00abc"
end
it "does not move the file read pointer to the specified byte offset" do
File.open(@name, "r+") do |f|
f.read(1).should == "1"
f.truncate(0)
f.read(1).should == nil
end
end
it "truncates a file" do
File.size(@name).should == 10
@file.truncate(5)
File.size(@name).should == 5
File.open(@name, "r") do |f|
f.read(99).should == "12345"
f.should.eof?
end
end
it "truncates a file size to 0" do
@file.truncate(0).should == 0
IO.read(@name).should == ""
end
it "truncates a file size to 5" do
File.size(@name).should == 10
@file.truncate(5)
File.size(@name).should == 5
IO.read(@name).should == "12345"
end
it "truncates a file to a larger size than the original file" do
@file.truncate(12)
File.size(@name).should == 12
IO.read(@name).should == "1234567890\000\000"
end
it "truncates a file to the same size as the original file" do
@file.truncate(File.size(@name))
File.size(@name).should == 10
IO.read(@name).should == "1234567890"
end
it "raises an ArgumentError if not passed one argument" do
-> { @file.truncate }.should raise_error(ArgumentError)
-> { @file.truncate(1) }.should_not raise_error(ArgumentError)
end
platform_is_not :netbsd do
it "raises an Errno::EINVAL if the length argument is not valid" do
-> { @file.truncate(-1) }.should raise_error(Errno::EINVAL) # May fail
end
end
it "raises an IOError if file is closed" do
@file.close
@file.should.closed?
-> { @file.truncate(42) }.should raise_error(IOError)
end
it "raises an IOError if file is not opened for writing" do
File.open(@name, 'r') do |file|
-> { file.truncate(42) }.should raise_error(IOError)
end
end
it "raises a TypeError if not passed an Integer type for the for the argument" do
-> { @file.truncate(nil) }.should raise_error(TypeError)
end
end
|
