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53 lines
1.4 KiB
Ruby
53 lines
1.4 KiB
Ruby
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# -*- encoding: utf-8 -*-
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require_relative '../../spec_helper'
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ruby_version_is "2.5" do
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platform_is_not :windows do
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describe "IO#pread" do
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before :each do
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@fname = tmp("io_pread.txt")
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@contents = "1234567890"
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touch(@fname) { |f| f.write @contents }
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@file = File.open(@fname, "r+")
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end
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after :each do
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@file.close
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rm_r @fname
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end
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it "accepts a length, and an offset" do
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@file.pread(4, 0).should == "1234"
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@file.pread(3, 4).should == "567"
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end
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it "accepts a length, an offset, and an output buffer" do
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buffer = "foo"
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@file.pread(3, 4, buffer)
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buffer.should == "567"
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end
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it "does not advance the file pointer" do
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@file.pread(4, 0).should == "1234"
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@file.read.should == "1234567890"
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end
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it "raises EOFError if end-of-file is reached" do
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lambda { @file.pread(1, 10) }.should raise_error(EOFError)
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end
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it "raises IOError when file is not open in read mode" do
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File.open(@fname, "w") do |file|
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lambda { file.pread(1, 1) }.should raise_error(IOError)
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end
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end
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it "raises IOError when file is closed" do
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file = File.open(@fname, "r+")
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file.close
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lambda { file.pread(1, 1) }.should raise_error(IOError)
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end
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end
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end
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end
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