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120 lines
2.6 KiB
Ruby
120 lines
2.6 KiB
Ruby
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# -*- encoding: utf-8 -*-
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require File.expand_path('../../../spec_helper', __FILE__)
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require File.expand_path('../fixtures/classes', __FILE__)
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describe "IO#ungetc" do
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before :each do
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@io = IOSpecs.io_fixture "lines.txt"
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@empty = tmp('empty.txt')
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end
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after :each do
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@io.close unless @io.closed?
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rm_r @empty
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end
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it "pushes back one character onto stream" do
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@io.getc.should == ?V
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@io.ungetc(86)
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@io.getc.should == ?V
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@io.ungetc(10)
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@io.getc.should == ?\n
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@io.getc.should == ?o
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@io.getc.should == ?i
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# read the rest of line
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@io.readline.should == "ci la ligne une.\n"
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@io.getc.should == ?Q
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@io.ungetc(99)
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@io.getc.should == ?c
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end
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it "pushes back one character when invoked at the end of the stream" do
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# read entire content
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@io.read
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@io.ungetc(100)
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@io.getc.should == ?d
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end
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it "pushes back one character when invoked at the start of the stream" do
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@io.read(0)
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@io.ungetc(100)
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@io.getc.should == ?d
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end
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it "pushes back one character when invoked on empty stream" do
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touch(@empty)
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File.open(@empty) { |empty|
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empty.getc().should == nil
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empty.ungetc(10)
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empty.getc.should == ?\n
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}
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end
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it "affects EOF state" do
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touch(@empty)
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File.open(@empty) { |empty|
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empty.eof?.should == true
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empty.getc.should == nil
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empty.ungetc(100)
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empty.eof?.should == false
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}
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end
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it "adjusts the stream position" do
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@io.pos.should == 0
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# read one char
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c = @io.getc
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@io.pos.should == 1
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@io.ungetc(c)
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@io.pos.should == 0
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# read all
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@io.read
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pos = @io.pos
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@io.ungetc(98)
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@io.pos.should == pos - 1
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end
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it "makes subsequent unbuffered operations to raise IOError" do
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@io.getc
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@io.ungetc(100)
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lambda { @io.sysread(1) }.should raise_error(IOError)
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end
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it "does not affect the stream and returns nil when passed nil" do
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@io.getc.should == ?V
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@io.ungetc(nil)
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@io.getc.should == ?o
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end
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it "puts one or more characters back in the stream" do
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@io.gets
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@io.ungetc("Aquí ").should be_nil
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@io.gets.chomp.should == "Aquí Qui è la linea due."
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end
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it "calls #to_str to convert the argument if it is not an Integer" do
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chars = mock("io ungetc")
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chars.should_receive(:to_str).and_return("Aquí ")
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@io.ungetc(chars).should be_nil
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@io.gets.chomp.should == "Aquí Voici la ligne une."
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end
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it "returns nil when invoked on stream that was not yet read" do
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@io.ungetc(100).should be_nil
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end
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it "raises IOError on closed stream" do
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@io.getc
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@io.close
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lambda { @io.ungetc(100) }.should raise_error(IOError)
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end
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end
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