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81 lines
2.2 KiB
Ruby
81 lines
2.2 KiB
Ruby
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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 "StringIO#readpartial" do
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before :each do
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@string = StringIO.new('Stop, look, listen')
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end
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after :each do
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@string.close unless @string.closed?
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end
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it "raises IOError on closed stream" do
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@string.close
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lambda { @string.readpartial(10) }.should raise_error(IOError)
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end
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it "reads at most the specified number of bytes" do
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# buffered read
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@string.read(1).should == 'S'
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# return only specified number, not the whole buffer
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@string.readpartial(1).should == "t"
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end
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it "reads after ungetc with data in the buffer" do
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c = @string.getc
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@string.ungetc(c)
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@string.readpartial(4).should == "Stop"
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@string.readpartial(3).should == ", l"
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end
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it "reads after ungetc without data in the buffer" do
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@string = StringIO.new
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@string.write("f").should == 1
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@string.rewind
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c = @string.getc
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c.should == 'f'
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@string.ungetc(c).should == nil
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@string.readpartial(2).should == "f"
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@string.rewind
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# now, also check that the ungot char is cleared and
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# not returned again
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@string.write("b").should == 1
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@string.rewind
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@string.readpartial(2).should == "b"
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end
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it "discards the existing buffer content upon successful read" do
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buffer = "existing"
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@string.readpartial(11, buffer)
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buffer.should == "Stop, look,"
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end
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it "raises EOFError on EOF" do
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@string.readpartial(18).should == 'Stop, look, listen'
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lambda { @string.readpartial(10) }.should raise_error(EOFError)
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end
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it "discards the existing buffer content upon error" do
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buffer = 'hello'
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@string.readpartial(100)
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lambda { @string.readpartial(1, buffer) }.should raise_error(EOFError)
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buffer.should be_empty
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end
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it "raises IOError if the stream is closed" do
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@string.close
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lambda { @string.readpartial(1) }.should raise_error(IOError)
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end
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it "raises ArgumentError if the negative argument is provided" do
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lambda { @string.readpartial(-1) }.should raise_error(ArgumentError)
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end
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it "immediately returns an empty string if the length argument is 0" do
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@string.readpartial(0).should == ""
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end
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end
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