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# encoding: ascii-8bit
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
lambda { [65].pack("ccc", buffer: []) }.should raise_error(
TypeError, "buffer must be String, not Array")
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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