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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "IO#read_nonblock" do
before :each do
@read, @write = IO.pipe
end
after :each do
@read.close if @read && !@read.closed?
@write.close if @write && !@write.closed?
end
it "raises an exception extending IO::WaitReadable when there is no data" do
-> { @read.read_nonblock(5) }.should raise_error(IO::WaitReadable) { |e|
platform_is_not :windows do
e.should be_kind_of(Errno::EAGAIN)
end
platform_is :windows do
e.should be_kind_of(Errno::EWOULDBLOCK)
end
}
end
context "when exception option is set to false" do
context "when there is no data" do
it "returns :wait_readable" do
@read.read_nonblock(5, exception: false).should == :wait_readable
end
end
context "when the end is reached" do
it "returns nil" do
@write << "hello"
@write.close
@read.read_nonblock(5)
@read.read_nonblock(5, exception: false).should be_nil
end
end
end
platform_is_not :windows do
it 'sets the IO in nonblock mode' do
require 'io/nonblock'
@write.write "abc"
@read.read_nonblock(1).should == "a"
@read.should.nonblock?
end
end
it "returns at most the number of bytes requested" do
@write << "hello"
@read.read_nonblock(4).should == "hell"
end
it "reads after ungetc with data in the buffer" do
@write.write("foobar")
@read.set_encoding(
'utf-8', universal_newline: false
)
c = @read.getc
@read.ungetc(c)
@read.read_nonblock(3).should == "foo"
@read.read_nonblock(3).should == "bar"
end
it "raises an exception after ungetc with data in the buffer and character conversion enabled" do
@write.write("foobar")
@read.set_encoding(
'utf-8', universal_newline: true
)
c = @read.getc
@read.ungetc(c)
-> { @read.read_nonblock(3).should == "foo" }.should raise_error(IOError)
end
it "returns less data if that is all that is available" do
@write << "hello"
@read.read_nonblock(10).should == "hello"
end
it "allows for reading 0 bytes before any write" do
@read.read_nonblock(0).should == ""
end
it "allows for reading 0 bytes after a write" do
@write.write "1"
@read.read_nonblock(0).should == ""
@read.read_nonblock(1).should == "1"
end
it "raises ArgumentError when length is less than 0" do
-> { @read.read_nonblock(-1) }.should raise_error(ArgumentError)
end
it "reads into the passed buffer" do
buffer = ""
@write.write("1")
@read.read_nonblock(1, buffer)
buffer.should == "1"
end
it "returns the passed buffer" do
buffer = ""
@write.write("1")
output = @read.read_nonblock(1, buffer)
output.should equal(buffer)
end
it "discards the existing buffer content upon successful read" do
buffer = "existing content"
@write.write("hello world")
@write.close
@read.read_nonblock(11, buffer)
buffer.should == "hello world"
end
it "discards the existing buffer content upon error" do
buffer = "existing content"
@write.close
-> { @read.read_nonblock(1, buffer) }.should raise_error(EOFError)
buffer.should be_empty
end
it "raises IOError on closed stream" do
-> { IOSpecs.closed_io.read_nonblock(5) }.should raise_error(IOError)
end
it "raises EOFError when the end is reached" do
@write << "hello"
@write.close
@read.read_nonblock(5)
-> { @read.read_nonblock(5) }.should raise_error(EOFError)
end
it "preserves the encoding of the given buffer" do
buffer = ''.encode(Encoding::ISO_8859_1)
@write.write("abc")
@write.close
@read.read_nonblock(10, buffer)
buffer.encoding.should == Encoding::ISO_8859_1
end
end
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