crystal-cbor/spec/cbor/from_cbor_spec.cr

require "../spec_helper"

enum TestEnum
  Foo = 1
end

describe "CBOR helpers on basic types" do
  describe "#from_cbor" do
    tests = [
      {String, Bytes[0x61, 0x61], "a"},
      {UInt8, Bytes[0x18, 0x18], 24},
      {UInt16, Bytes[0x19, 0x03, 0xe8], 1000},
      {UInt32, Bytes[0x1a, 0x00, 0x0f, 0x42, 0x40], 1000000},
      {UInt64, Bytes[0x1b, 0x00, 0x00, 0x00, 0xe8, 0xd4, 0xa5, 0x10, 0x00], 1000000000000},
      {Int8, Bytes[0x29], -10},
      {Bool, Bytes[0xf4], false},
      {Bool, Bytes[0xf5], true},
      {Bytes, Bytes[0x44, 0x01, 0x02, 0x03, 0x04], Bytes[0x01, 0x02, 0x03, 0x04]},
      {Time,
       Bytes[0xc0, 0x74, 0x32, 0x30, 0x31, 0x33, 0x2d, 0x30, 0x33, 0x2d, 0x32, 0x31, 0x54, 0x32, 0x30, 0x3a, 0x30, 0x34, 0x3a, 0x30, 0x30, 0x5a],
       Time::Format::RFC_3339.parse("2013-03-21T20:04:00Z")},
      {Time, Bytes[0xc1, 0x1a, 0x51, 0x4b, 0x67, 0xb0], Time.unix(1363896240)},
      {Time, Bytes[0xc1, 0xfb, 0x41, 0xd4, 0x52, 0xd9, 0xec, 0x20, 0x00, 0x00], Time.unix_ms((BigFloat.new(1363896240.5) * 1000).to_u64)},
      {Nil, Bytes[0xf6], nil},
      {Nil, Bytes[0xf7], nil},
      {Float32, Bytes[0xfb, 0x3f, 0xf1, 0x99, 0x99, 0x99, 0x99, 0x99, 0x9a], 1.1_f32},
      {Float64, Bytes[0xfa, 0x47, 0xc3, 0x50, 0x00], 100000.0_f64},
      {Set(Int8), Bytes[0x83, 0x01, 0x02, 0x03], Set(Int8){1, 2, 3}},
      {Array(Int8), Bytes[0x83, 0x01, 0x02, 0x03], [1_i8, 2_i8, 3_i8]},
      {Array(Array(Int8) | Int8),
       Bytes[0x83, 0x01, 0x82, 0x02, 0x03, 0x82, 0x04, 0x05],
       [1_i8, [2_i8, 3_i8], [4_i8, 5_i8]]},
      {Array(UInt8), Bytes[0x9f, 0xff], [] of UInt8},
      {Array(UInt8), Bytes[0x9f, 0x01, 0xff], [1_u8] of UInt8},
      {Array(Int32),
       Bytes[0x9f, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x18, 0x18, 0x19, 0xff],
       [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]},
      {Array(Array(Int8) | Int8),
       Bytes[0x9f, 0x01, 0x82, 0x02, 0x03, 0x9f, 0x04, 0x05, 0xff, 0xff],
       [1_i8, [2_i8, 3_i8], [4_i8, 5_i8]]},
      {Hash(UInt8, UInt8), Bytes[0xa0], {} of UInt8 => UInt8},
      {Hash(UInt8, UInt8), Bytes[0xa2, 0x01, 0x02, 0x03, 0x04], Hash(UInt8, UInt8){1 => 2, 3 => 4}},
      {TestEnum, Bytes[0x1a, 0x00, 0x00, 0x00, 0x01], TestEnum::Foo},
      {Tuple(Int8, Int8), Bytes[0x82, 0x01, 0x02], {1_i8, 2_i8}},
      {NamedTuple(a: UInt8, b: Array(UInt8)), Bytes[0xa2, 0x61, 0x61, 0x01, 0x61, 0x62, 0x82, 0x02, 0x03], {a: 1_u8, b: [2_u8, 3_u8]}},
      {BigInt, Bytes[0xc2, 0x49, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], BigInt.new("18446744073709551616")},
      {BigInt, Bytes[0x18, 0x18], BigInt.new(24)}, # BigInt from int
      {BigDecimal, Bytes[0xc4, 0x82, 0x21, 0x19, 0x6a, 0xb3], BigDecimal.new(273.15)},
      {BigDecimal, Bytes[0xc5, 0x82, 0x20, 0x03], BigDecimal.new(1.5)},
    ]

    tests.each do |tt|
      type, bytes, want = tt

      it "decodes #{type}" do
        res = type.from_cbor(bytes)
        res.should eq(want)
      end
    end
  end
end