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require 'net/dns'
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RSpec.describe Net::DNS::Names do
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  subject do
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    obj = Object.new
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    obj.extend(described_class)
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  end
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  describe '#dn_expand' do
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    context 'when offset is great than packet length' do
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      let(:packet) do
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        'AAAAA'
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      end
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      let(:offset) do
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        10
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      end
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      it 'raises an ExpandError exception' do
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        expect { subject.dn_expand(packet, offset) }.to raise_exception(ExpandError)
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      end
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    end
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    context 'when packet length is less than offset + INT16SZ' do
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      let(:packet) do
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        "\xc0"
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      end
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      let(:offset) do
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        0
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      end
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      it 'raises an ExpandError exception' do
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        expect { subject.dn_expand(packet, offset) }.to raise_exception(ExpandError)
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      end
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    end
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    context 'when packet length is less than offset + packet length' do
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      let(:packet) do
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        'AAAAA'
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      end
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      let(:offset) do
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        4
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      end
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      it 'raises an ExpandError exception' do
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        expect { subject.dn_expand(packet, offset) }.to raise_exception(ExpandError)
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      end
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    end
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  end
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  describe '#pack_name' do
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    context 'when name data size is larger than 255 bytes' do
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      let(:name) do
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        'A' * (255+1)
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      end
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      it 'raises an ArgumentError exception' do
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        expect { subject.pack_name(name) }.to raise_exception(ArgumentError)
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      end
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    end
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    context 'when label data is larger than 63 bytes' do
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      let(:name) do
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        'A' * (63+1) + '.'
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      end
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      it 'raises an ArgumentError exception' do
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        expect { subject.pack_name(name) }.to raise_exception(ArgumentError)
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      end 
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    end
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  end
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  describe '#names_array' do
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    let(:name) do
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      "AAA.AAA"
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    end
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    it 'returns an Array' do
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      expect(subject.names_array(name)).to be_kind_of(Array)
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    end
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  end
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  describe '#dn_comp' do
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    let(:name) do
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      'AAAA'
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    end
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    let(:offset) do
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      0
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    end
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    let(:compnames) do
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      {}
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    end
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    it 'returns 3 values' do
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      v = subject.dn_comp(name, offset, compnames)
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      expect(v.length).to eq(3)
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      expect(v[0]).to be_kind_of(String)
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      expect(v[1]).to be_kind_of(Integer)
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      expect(v[2]).to be_kind_of(Hash)
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    end
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  end
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  describe '#valid?' do
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    context 'when FQDN is valid' do
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      let(:fqdn) do
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        'example.com'
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      end
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      it 'returns the FQDN' do
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        expect(subject.valid?(fqdn)).to eq(fqdn)
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      end
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    end
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    context 'when FQDN is not valid' do
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      let(:fqdn) do
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        'INVALID'
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      end
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      it 'raises ArgumentError exception' do
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        expect { subject.valid?(fqdn) }.to raise_exception(ArgumentError)
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      end
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    end
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  end
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end
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