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95 lines
3.5 KiB
Forth
95 lines
3.5 KiB
Forth
namespace UnitTests.Huffman.TestHuffmanNode
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open Xunit
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open System.Collections.Generic
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open BrotliLib.Collections.Huffman
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open BrotliLib.Serialization
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module Helper =
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let leaf = HuffmanNode.Leaf('a')
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let depth1 = HuffmanNode.Path(
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HuffmanNode.Leaf('a'),
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HuffmanNode.Leaf('b')
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)
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let depth2count3 = HuffmanNode.Path(
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HuffmanNode.Path(
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HuffmanNode.Leaf('a'),
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HuffmanNode.Leaf('b')
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),
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HuffmanNode.Leaf('c')
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)
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let depth2count4 = HuffmanNode.Path(
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HuffmanNode.Path(
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HuffmanNode.Leaf('a'),
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HuffmanNode.Leaf('b')
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),
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HuffmanNode.Path(
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HuffmanNode.Leaf('c'),
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HuffmanNode.Leaf('d')
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)
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)
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module Traversal =
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[<Fact>]
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let ``a leaf node returns its value without consuming any bits`` () =
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Assert.Equal('a', Helper.leaf.LookupValue(BitStream().GetReader()))
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[<Fact>]
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let ``a path of depth 1 returns correct values for each path`` () =
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Assert.Equal('a', Helper.depth1.LookupValue(BitStream("0").GetReader()))
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Assert.Equal('b', Helper.depth1.LookupValue(BitStream("1").GetReader()))
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[<Fact>]
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let ``a path of depth 2 with 3 symbols returns correct values for each path`` () =
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Assert.Equal('a', Helper.depth2count3.LookupValue(BitStream("00").GetReader()))
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Assert.Equal('b', Helper.depth2count3.LookupValue(BitStream("01").GetReader()))
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Assert.Equal('c', Helper.depth2count3.LookupValue(BitStream("1").GetReader()))
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[<Fact>]
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let ``a path of depth 2 with 4 symbols returns correct values for each path`` () =
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Assert.Equal('a', Helper.depth2count4.LookupValue(BitStream("00").GetReader()))
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Assert.Equal('b', Helper.depth2count4.LookupValue(BitStream("01").GetReader()))
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Assert.Equal('c', Helper.depth2count4.LookupValue(BitStream("10").GetReader()))
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Assert.Equal('d', Helper.depth2count4.LookupValue(BitStream("11").GetReader()))
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[<Fact>]
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let ``running out of bits returns default value`` () =
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Assert.Equal(Unchecked.defaultof<char>, Helper.depth2count4.LookupValue(BitStream("0").GetReader()))
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module ValueMap =
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[<Fact>]
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let ``a leaf node returns its value mapped to an empty bit stream`` () =
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Assert.Equal<IEnumerable<KeyValuePair<_, _>>>(seq {
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yield KeyValuePair('a', BitStream())
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}, Helper.leaf.GenerateValueMap())
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[<Fact>]
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let ``a path of depth 1 returns its values mapped to correct bit streams`` () =
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Assert.Equal<IEnumerable<KeyValuePair<_, _>>>(seq {
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yield KeyValuePair('a', BitStream("0"))
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yield KeyValuePair('b', BitStream("1"))
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}, Helper.depth1.GenerateValueMap())
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[<Fact>]
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let ``a path of depth 2 with 3 symbols returns its values mapped to correct bit streams`` () =
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Assert.Equal<IEnumerable<KeyValuePair<_, _>>>(seq {
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yield KeyValuePair('a', BitStream("00"))
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yield KeyValuePair('b', BitStream("01"))
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yield KeyValuePair('c', BitStream("1"))
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}, Helper.depth2count3.GenerateValueMap())
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[<Fact>]
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let ``a path of depth 2 with 4 symbols returns its values mapped to correct bit streams`` () =
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Assert.Equal<IEnumerable<KeyValuePair<_, _>>>(seq {
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yield KeyValuePair('a', BitStream("00"))
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yield KeyValuePair('b', BitStream("01"))
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yield KeyValuePair('c', BitStream("10"))
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yield KeyValuePair('d', BitStream("11"))
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}, Helper.depth2count4.GenerateValueMap())
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