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# -*- encoding: binary -*-
require_relative '../../../spec_helper'
require_relative '../fixtures/classes'
require_relative 'shared/basic'
describe "Array#pack with format 'x'" do
it_behaves_like :array_pack_basic, 'x'
it_behaves_like :array_pack_basic_non_float, 'x'
it_behaves_like :array_pack_no_platform, 'x'
it "adds a NULL byte with an empty array" do
[].pack("x").should == "\x00"
end
it "adds a NULL byte without consuming an element" do
[1, 2].pack("CxC").should == "\x01\x00\x02"
end
it "is not affected by a previous count modifier" do
[].pack("x3x").should == "\x00\x00\x00\x00"
end
it "adds multiple NULL bytes when passed a count modifier" do
[].pack("x3").should == "\x00\x00\x00"
end
it "does not add a NULL byte if the count modifier is zero" do
[].pack("x0").should == ""
end
it "does not add a NULL byte when passed the '*' modifier" do
[].pack("x*").should == ""
end
end
describe "Array#pack with format 'X'" do
it_behaves_like :array_pack_basic, 'X'
it_behaves_like :array_pack_basic_non_float, 'X'
it_behaves_like :array_pack_no_platform, 'X'
it "reduces the output string by one byte at the point it is encountered" do
[1, 2, 3].pack("C2XC").should == "\x01\x03"
end
it "does not consume any elements" do
[1, 2, 3].pack("CXC").should == "\x02"
end
it "reduces the output string by multiple bytes when passed a count modifier" do
[1, 2, 3, 4, 5].pack("C2X2C").should == "\x03"
end
it "has no affect when passed the '*' modifier" do
[1, 2, 3].pack("C2X*C").should == "\x01\x02\x03"
end
it "raises an ArgumentError if the output string is empty" do
lambda { [1, 2, 3].pack("XC") }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if the count modifier is greater than the bytes in the string" do
lambda { [1, 2, 3].pack("C2X3") }.should raise_error(ArgumentError)
end
end
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