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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
guard -> { platform_is_not :windows or ruby_version_is "3.3" } do
describe "IO#pread" do
before :each do
@fname = tmp("io_pread.txt")
@contents = "1234567890"
touch(@fname) { |f| f.write @contents }
@file = File.open(@fname, "r+")
end
after :each do
@file.close
rm_r @fname
end
it "accepts a length, and an offset" do
@file.pread(4, 0).should == "1234"
@file.pread(3, 4).should == "567"
end
it "accepts a length, an offset, and an output buffer" do
buffer = "foo"
@file.pread(3, 4, buffer)
buffer.should == "567"
end
it "shrinks the buffer in case of less bytes read" do
buffer = "foo"
@file.pread(1, 0, buffer)
buffer.should == "1"
end
it "grows the buffer in case of more bytes read" do
buffer = "foo"
@file.pread(5, 0, buffer)
buffer.should == "12345"
end
it "does not advance the file pointer" do
@file.pread(4, 0).should == "1234"
@file.read.should == "1234567890"
end
it "ignores the current offset" do
@file.pos = 3
@file.pread(4, 0).should == "1234"
end
it "returns an empty string for maxlen = 0" do
@file.pread(0, 4).should == ""
end
it "ignores the offset for maxlen = 0, even if it is out of file bounds" do
@file.pread(0, 400).should == ""
end
it "does not reset the buffer when reading with maxlen = 0" do
buffer = "foo"
@file.pread(0, 4, buffer)
buffer.should == "foo"
@file.pread(0, 400, buffer)
buffer.should == "foo"
end
it "converts maxlen to Integer using #to_int" do
maxlen = mock('maxlen')
maxlen.should_receive(:to_int).and_return(4)
@file.pread(maxlen, 0).should == "1234"
end
it "converts offset to Integer using #to_int" do
offset = mock('offset')
offset.should_receive(:to_int).and_return(0)
@file.pread(4, offset).should == "1234"
end
it "converts a buffer to String using to_str" do
buffer = mock('buffer')
buffer.should_receive(:to_str).at_least(1).and_return("foo")
@file.pread(4, 0, buffer)
buffer.should_not.is_a?(String)
buffer.to_str.should == "1234"
end
it "raises TypeError if maxlen is not an Integer and cannot be coerced into Integer" do
maxlen = Object.new
-> { @file.pread(maxlen, 0) }.should raise_error(TypeError, 'no implicit conversion of Object into Integer')
end
it "raises TypeError if offset is not an Integer and cannot be coerced into Integer" do
offset = Object.new
-> { @file.pread(4, offset) }.should raise_error(TypeError, 'no implicit conversion of Object into Integer')
end
it "raises ArgumentError for negative values of maxlen" do
-> { @file.pread(-4, 0) }.should raise_error(ArgumentError, 'negative string size (or size too big)')
end
it "raised Errno::EINVAL for negative values of offset" do
-> { @file.pread(4, -1) }.should raise_error(Errno::EINVAL, /Invalid argument/)
end
it "raises TypeError if the buffer is not a String and cannot be coerced into String" do
buffer = Object.new
-> { @file.pread(4, 0, buffer) }.should raise_error(TypeError, 'no implicit conversion of Object into String')
end
it "raises EOFError if end-of-file is reached" do
-> { @file.pread(1, 10) }.should raise_error(EOFError)
end
it "raises IOError when file is not open in read mode" do
File.open(@fname, "w") do |file|
-> { file.pread(1, 1) }.should raise_error(IOError)
end
end
it "raises IOError when file is closed" do
file = File.open(@fname, "r+")
file.close
-> { file.pread(1, 1) }.should raise_error(IOError)
end
end
end
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