defmodule VariableLengthQuantityTest do use ExUnit.Case describe "Encode a series of integers, producing a series of bytes." do # @tag :pending test "zero" do integers = [0x0] output = VariableLengthQuantity.encode(integers) expected = <<0x0>> assert output == expected end @tag :pending test "arbitrary single byte" do integers = [0x40] output = VariableLengthQuantity.encode(integers) expected = <<0x40>> assert output == expected end @tag :pending test "asymmetric single byte" do integers = [0x53] output = VariableLengthQuantity.encode(integers) expected = <<0x53>> assert output == expected end @tag :pending test "largest single byte" do integers = [0x7F] output = VariableLengthQuantity.encode(integers) expected = <<0x7F>> assert output == expected end @tag :pending test "smallest double byte" do integers = [0x80] output = VariableLengthQuantity.encode(integers) expected = <<0x81, 0x0>> assert output == expected end @tag :pending test "arbitrary double byte" do integers = [0x2000] output = VariableLengthQuantity.encode(integers) expected = <<0xC0, 0x0>> assert output == expected end @tag :pending test "asymmetric double byte" do integers = [0xAD] output = VariableLengthQuantity.encode(integers) expected = <<0x81, 0x2D>> assert output == expected end @tag :pending test "largest double byte" do integers = [0x3FFF] output = VariableLengthQuantity.encode(integers) expected = <<0xFF, 0x7F>> assert output == expected end @tag :pending test "smallest triple byte" do integers = [0x4000] output = VariableLengthQuantity.encode(integers) expected = <<0x81, 0x80, 0x0>> assert output == expected end @tag :pending test "arbitrary triple byte" do integers = [0x100000] output = VariableLengthQuantity.encode(integers) expected = <<0xC0, 0x80, 0x0>> assert output == expected end @tag :pending test "asymmetric triple byte" do integers = [0x1D59C] output = VariableLengthQuantity.encode(integers) expected = <<0x87, 0xAB, 0x1C>> assert output == expected end @tag :pending test "largest triple byte" do integers = [0x1FFFFF] output = VariableLengthQuantity.encode(integers) expected = <<0xFF, 0xFF, 0x7F>> assert output == expected end @tag :pending test "smallest quadruple byte" do integers = [0x200000] output = VariableLengthQuantity.encode(integers) expected = <<0x81, 0x80, 0x80, 0x0>> assert output == expected end @tag :pending test "arbitrary quadruple byte" do integers = [0x8000000] output = VariableLengthQuantity.encode(integers) expected = <<0xC0, 0x80, 0x80, 0x0>> assert output == expected end @tag :pending test "asymmetric quadruple byte" do integers = [0x357704] output = VariableLengthQuantity.encode(integers) expected = <<0x81, 0xD5, 0xEE, 0x4>> assert output == expected end @tag :pending test "largest quadruple byte" do integers = [0xFFFFFFF] output = VariableLengthQuantity.encode(integers) expected = <<0xFF, 0xFF, 0xFF, 0x7F>> assert output == expected end @tag :pending test "smallest quintuple byte" do integers = [0x10000000] output = VariableLengthQuantity.encode(integers) expected = <<0x81, 0x80, 0x80, 0x80, 0x0>> assert output == expected end @tag :pending test "arbitrary quintuple byte" do integers = [0xFF000000] output = VariableLengthQuantity.encode(integers) expected = <<0x8F, 0xF8, 0x80, 0x80, 0x0>> assert output == expected end @tag :pending test "asymmetric quintuple byte" do integers = [0x86656105] output = VariableLengthQuantity.encode(integers) expected = <<0x88, 0xB3, 0x95, 0xC2, 0x5>> assert output == expected end @tag :pending test "maximum 32-bit integer input" do integers = [0xFFFFFFFF] output = VariableLengthQuantity.encode(integers) expected = <<0x8F, 0xFF, 0xFF, 0xFF, 0x7F>> assert output == expected end @tag :pending test "two single-byte values" do integers = [0x40, 0x7F] output = VariableLengthQuantity.encode(integers) expected = <<0x40, 0x7F>> assert output == expected end @tag :pending test "two multi-byte values" do integers = [0x4000, 0x123456] output = VariableLengthQuantity.encode(integers) expected = <<0x81, 0x80, 0x0, 0xC8, 0xE8, 0x56>> assert output == expected end @tag :pending test "many multi-byte values" do integers = [0x2000, 0x123456, 0xFFFFFFF, 0x0, 0x3FFF, 0x4000] output = VariableLengthQuantity.encode(integers) expected = << 0xC0, 0x0, 0xC8, 0xE8, 0x56, 0xFF, 0xFF, 0xFF, 0x7F, 0x0, 0xFF, 0x7F, 0x81, 0x80, 0x0 >> assert output == expected end end describe "Decode a series of bytes, producing a series of integers." do @tag :pending test "one byte" do encoded = <<0x7F>> output = VariableLengthQuantity.decode(encoded) expected = {:ok, [0x7F]} assert output == expected end @tag :pending test "two bytes" do encoded = <<0xC0, 0x0>> output = VariableLengthQuantity.decode(encoded) expected = {:ok, [0x2000]} assert output == expected end @tag :pending test "three bytes" do encoded = <<0xFF, 0xFF, 0x7F>> output = VariableLengthQuantity.decode(encoded) expected = {:ok, [0x1FFFFF]} assert output == expected end @tag :pending test "four bytes" do encoded = <<0x81, 0x80, 0x80, 0x0>> output = VariableLengthQuantity.decode(encoded) expected = {:ok, [0x200000]} assert output == expected end @tag :pending test "maximum 32-bit integer" do encoded = <<0x8F, 0xFF, 0xFF, 0xFF, 0x7F>> output = VariableLengthQuantity.decode(encoded) expected = {:ok, [0xFFFFFFFF]} assert output == expected end @tag :pending test "incomplete sequence causes error" do encoded = <<0xFF>> output = VariableLengthQuantity.decode(encoded) expected = {:error, "incomplete sequence"} assert output == expected end @tag :pending test "incomplete sequence causes error, even if value is zero" do encoded = <<0x80>> output = VariableLengthQuantity.decode(encoded) expected = {:error, "incomplete sequence"} assert output == expected end @tag :pending test "multiple values" do encoded = << 0xC0, 0x0, 0xC8, 0xE8, 0x56, 0xFF, 0xFF, 0xFF, 0x7F, 0x0, 0xFF, 0x7F, 0x81, 0x80, 0x0 >> output = VariableLengthQuantity.decode(encoded) expected = {:ok, [0x2000, 0x123456, 0xFFFFFFF, 0x0, 0x3FFF, 0x4000]} assert output == expected end end end