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# -*- encoding: binary -*-
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "IO#readpartial" do
before :each do
@rd, @wr = IO.pipe
@rd.binmode
@wr.binmode
end
after :each do
@rd.close unless @rd.closed?
@wr.close unless @wr.closed?
end
it "raises IOError on closed stream" do
lambda { IOSpecs.closed_io.readpartial(10) }.should raise_error(IOError)
@rd.close
lambda { @rd.readpartial(10) }.should raise_error(IOError)
end
it "reads at most the specified number of bytes" do
@wr.write("foobar")
# buffered read
@rd.read(1).should == 'f'
# return only specified number, not the whole buffer
@rd.readpartial(1).should == "o"
end
it "reads after ungetc with data in the buffer" do
@wr.write("foobar")
c = @rd.getc
@rd.ungetc(c)
@rd.readpartial(3).should == "foo"
@rd.readpartial(3).should == "bar"
end
it "reads after ungetc with multibyte characters in the buffer" do
@wr.write("∂φ/∂x = gaîté")
c = @rd.getc
@rd.ungetc(c)
@rd.readpartial(3).should == "\xE2\x88\x82"
@rd.readpartial(3).should == "\xCF\x86/"
end
it "reads after ungetc without data in the buffer" do
@wr.write("f")
c = @rd.getc
@rd.ungetc(c)
@rd.readpartial(2).should == "f"
# now, also check that the ungot char is cleared and
# not returned again
@wr.write("b")
@rd.readpartial(2).should == "b"
end
it "discards the existing buffer content upon successful read" do
buffer = "existing"
@wr.write("hello world")
@wr.close
@rd.readpartial(11, buffer)
buffer.should == "hello world"
end
it "raises EOFError on EOF" do
@wr.write("abc")
@wr.close
@rd.readpartial(10).should == 'abc'
lambda { @rd.readpartial(10) }.should raise_error(EOFError)
end
it "discards the existing buffer content upon error" do
buffer = 'hello'
@wr.close
lambda { @rd.readpartial(1, buffer) }.should raise_error(EOFError)
buffer.should be_empty
end
it "raises IOError if the stream is closed" do
@wr.close
lambda { @rd.readpartial(1) }.should raise_error(IOError)
end
it "raises ArgumentError if the negative argument is provided" do
lambda { @rd.readpartial(-1) }.should raise_error(ArgumentError)
end
it "immediately returns an empty string if the length argument is 0" do
@rd.readpartial(0).should == ""
end
end
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