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# encoding: binary
require_relative '../../../spec_helper'
describe "Array#pack with :buffer option" do
it "returns specified buffer" do
n = [ 65, 66, 67 ]
buffer = " "*3
result = n.pack("ccc", buffer: buffer) #=> "ABC"
result.should equal(buffer)
end
it "adds result at the end of buffer content" do
n = [ 65, 66, 67 ] # result without buffer is "ABC"
buffer = +""
n.pack("ccc", buffer: buffer).should == "ABC"
buffer = +"123"
n.pack("ccc", buffer: buffer).should == "123ABC"
buffer = +"12345"
n.pack("ccc", buffer: buffer).should == "12345ABC"
end
it "raises TypeError exception if buffer is not String" do
-> { [65].pack("ccc", buffer: []) }.should raise_error(
TypeError, "buffer must be String, not Array")
end
it "raise FrozenError if buffer is frozen" do
-> { [65].pack("c", buffer: "frozen-string".freeze) }.should raise_error(FrozenError)
end
it "preserves the encoding of the given buffer" do
buffer = ''.encode(Encoding::ISO_8859_1)
[65, 66, 67].pack("ccc", buffer: buffer)
buffer.encoding.should == Encoding::ISO_8859_1
end
context "offset (@) is specified" do
it 'keeps buffer content if it is longer than offset' do
n = [ 65, 66, 67 ]
buffer = +"123456"
n.pack("@3ccc", buffer: buffer).should == "123ABC"
end
it "fills the gap with \\0 if buffer content is shorter than offset" do
n = [ 65, 66, 67 ]
buffer = +"123"
n.pack("@6ccc", buffer: buffer).should == "123\0\0\0ABC"
end
it 'does not keep buffer content if it is longer than offset + result' do
n = [ 65, 66, 67 ]
buffer = +"1234567890"
n.pack("@3ccc", buffer: buffer).should == "123ABC"
end
end
end
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