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