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e5319dc985
[Feature #18254] This is useful to avoid repeteadly copying strings when parsing binary formats
30 lines
1 KiB
Ruby
30 lines
1 KiB
Ruby
require_relative '../../spec_helper'
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describe "String#unpack1" do
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it "returns the first value of #unpack" do
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"ABCD".unpack1('x3C').should == "ABCD".unpack('x3C')[0]
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"\u{3042 3044 3046}".unpack1("U*").should == 0x3042
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"aG9nZWZ1Z2E=".unpack1("m").should == "hogefuga"
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"A".unpack1("B*").should == "01000001"
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end
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ruby_version_is "3.1" do
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it "starts unpacking from the given offset" do
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"ZZABCD".unpack1('x3C', offset: 2).should == "ABCD".unpack('x3C')[0]
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"ZZZZaG9nZWZ1Z2E=".unpack1("m", offset: 4).should == "hogefuga"
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"ZA".unpack1("B*", offset: 1).should == "01000001"
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end
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it "raises an ArgumentError when the offset is negative" do
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-> { "a".unpack1("C", offset: -1) }.should raise_error(ArgumentError)
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end
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it "returns nil if the offset is at the end of the string" do
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"a".unpack1("C", offset: 1).should == nil
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end
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it "raises an ArgumentError when the offset is larget than the string" do
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-> { "a".unpack1("C", offset: 2) }.should raise_error(ArgumentError)
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end
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end
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end
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