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require_relative '../../spec_helper'
describe "String#unpack1" do
it "returns the first value of #unpack" do
"ABCD".unpack1('x3C').should == "ABCD".unpack('x3C')[0]
"\u{3042 3044 3046}".unpack1("U*").should == 0x3042
"aG9nZWZ1Z2E=".unpack1("m").should == "hogefuga"
"A".unpack1("B*").should == "01000001"
end
ruby_version_is "3.1" do
it "starts unpacking from the given offset" do
"ZZABCD".unpack1('x3C', offset: 2).should == "ABCD".unpack('x3C')[0]
"ZZZZaG9nZWZ1Z2E=".unpack1("m", offset: 4).should == "hogefuga"
"ZA".unpack1("B*", offset: 1).should == "01000001"
end
it "traits offset as a bytes offset" do
"؈".unpack("CC").should == [216, 136]
"؈".unpack1("C").should == 216
"؈".unpack1("C", offset: 1).should == 136
end
it "raises an ArgumentError when the offset is negative" do
-> { "a".unpack1("C", offset: -1) }.should raise_error(ArgumentError, "offset can't be negative")
end
it "returns nil if the offset is at the end of the string" do
"a".unpack1("C", offset: 1).should == nil
end
it "raises an ArgumentError when the offset is larger than the string bytesize" do
-> { "a".unpack1("C", offset: 2) }.should raise_error(ArgumentError, "offset outside of string")
end
end
end
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