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| 1 | +module TaskSeq.Tests.ChunkBySize |
| 2 | + |
| 3 | +open Xunit |
| 4 | +open FsUnit.Xunit |
| 5 | + |
| 6 | +open FSharp.Control |
| 7 | + |
| 8 | +// |
| 9 | +// TaskSeq.chunkBySize |
| 10 | +// |
| 11 | + |
| 12 | +module EmptySeq = |
| 13 | + [<Fact>] |
| 14 | + let ``TaskSeq-chunkBySize with null source raises`` () = assertNullArg <| fun () -> TaskSeq.chunkBySize 1 null |
| 15 | + |
| 16 | + [<Fact>] |
| 17 | + let ``TaskSeq-chunkBySize with zero raises ArgumentException before awaiting`` () = |
| 18 | + fun () -> TaskSeq.empty<int> |> TaskSeq.chunkBySize 0 |> ignore // throws eagerly, before enumeration |
| 19 | + |> should throw typeof<System.ArgumentException> |
| 20 | + |
| 21 | + [<Fact>] |
| 22 | + let ``TaskSeq-chunkBySize with negative raises ArgumentException before awaiting`` () = |
| 23 | + fun () -> TaskSeq.empty<int> |> TaskSeq.chunkBySize -1 |> ignore |
| 24 | + |> should throw typeof<System.ArgumentException> |
| 25 | + |
| 26 | + [<Theory; ClassData(typeof<TestEmptyVariants>)>] |
| 27 | + let ``TaskSeq-chunkBySize on empty sequence yields empty`` variant = |
| 28 | + Gen.getEmptyVariant variant |
| 29 | + |> TaskSeq.chunkBySize 1 |
| 30 | + |> verifyEmpty |
| 31 | + |
| 32 | + [<Theory; ClassData(typeof<TestEmptyVariants>)>] |
| 33 | + let ``TaskSeq-chunkBySize(99) on empty sequence yields empty`` variant = |
| 34 | + Gen.getEmptyVariant variant |
| 35 | + |> TaskSeq.chunkBySize 99 |
| 36 | + |> verifyEmpty |
| 37 | + |
| 38 | +module Immutable = |
| 39 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 40 | + let ``TaskSeq-chunkBySize preserves all elements in order`` variant = task { |
| 41 | + do! |
| 42 | + Gen.getSeqImmutable variant |
| 43 | + |> TaskSeq.chunkBySize 3 |
| 44 | + |> TaskSeq.collect TaskSeq.ofArray |
| 45 | + |> verify1To10 |
| 46 | + } |
| 47 | + |
| 48 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 49 | + let ``TaskSeq-chunkBySize(2) returns 5 chunks of 2 for a 10-element sequence`` variant = task { |
| 50 | + let! chunks = |
| 51 | + Gen.getSeqImmutable variant |
| 52 | + |> TaskSeq.chunkBySize 2 |
| 53 | + |> TaskSeq.toArrayAsync |
| 54 | + |
| 55 | + chunks |
| 56 | + |> should equal [| [| 1; 2 |]; [| 3; 4 |]; [| 5; 6 |]; [| 7; 8 |]; [| 9; 10 |] |] |
| 57 | + } |
| 58 | + |
| 59 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 60 | + let ``TaskSeq-chunkBySize(5) returns 2 full chunks for a 10-element sequence`` variant = task { |
| 61 | + let! chunks = |
| 62 | + Gen.getSeqImmutable variant |
| 63 | + |> TaskSeq.chunkBySize 5 |
| 64 | + |> TaskSeq.toArrayAsync |
| 65 | + |
| 66 | + chunks |> should equal [| [| 1..5 |]; [| 6..10 |] |] |
| 67 | + } |
| 68 | + |
| 69 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 70 | + let ``TaskSeq-chunkBySize(1) returns each element as its own array`` variant = task { |
| 71 | + let! chunks = |
| 72 | + Gen.getSeqImmutable variant |
| 73 | + |> TaskSeq.chunkBySize 1 |
| 74 | + |> TaskSeq.toArrayAsync |
| 75 | + |
| 76 | + chunks |> Array.length |> should equal 10 |
| 77 | + |
| 78 | + chunks |
| 79 | + |> Array.iteri (fun i chunk -> chunk |> should equal [| i + 1 |]) |
| 80 | + } |
| 81 | + |
| 82 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 83 | + let ``TaskSeq-chunkBySize last chunk contains remainder when sequence does not divide evenly`` variant = task { |
| 84 | + // 10 elements with chunk size 3 → chunks [1;2;3] [4;5;6] [7;8;9] [10] |
| 85 | + let! chunks = |
| 86 | + Gen.getSeqImmutable variant |
| 87 | + |> TaskSeq.chunkBySize 3 |
| 88 | + |> TaskSeq.toArrayAsync |
| 89 | + |
| 90 | + chunks |> Array.length |> should equal 4 |
| 91 | + chunks |> Array.last |> should equal [| 10 |] |
| 92 | + } |
| 93 | + |
| 94 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 95 | + let ``TaskSeq-chunkBySize larger than sequence returns single chunk with all elements`` variant = task { |
| 96 | + let! chunks = |
| 97 | + Gen.getSeqImmutable variant |
| 98 | + |> TaskSeq.chunkBySize 11 |
| 99 | + |> TaskSeq.toArrayAsync |
| 100 | + |
| 101 | + chunks |> Array.length |> should equal 1 |
| 102 | + chunks.[0] |> should equal [| 1..10 |] |
| 103 | + } |
| 104 | + |
| 105 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 106 | + let ``TaskSeq-chunkBySize equal to sequence length returns single full chunk`` variant = task { |
| 107 | + let! chunks = |
| 108 | + Gen.getSeqImmutable variant |
| 109 | + |> TaskSeq.chunkBySize 10 |
| 110 | + |> TaskSeq.toArrayAsync |
| 111 | + |
| 112 | + chunks |> Array.length |> should equal 1 |
| 113 | + chunks.[0] |> should equal [| 1..10 |] |
| 114 | + } |
| 115 | + |
| 116 | + [<Fact>] |
| 117 | + let ``TaskSeq-chunkBySize each chunk array is independent - modifying one does not affect others`` () = task { |
| 118 | + let! chunks = |
| 119 | + taskSeq { yield! [ 1..6 ] } |
| 120 | + |> TaskSeq.chunkBySize 3 |
| 121 | + |> TaskSeq.toArrayAsync |
| 122 | + |
| 123 | + // Mutate the first chunk |
| 124 | + chunks.[0].[0] <- 99 |
| 125 | + |
| 126 | + // The second chunk must be unaffected |
| 127 | + chunks.[1] |> should equal [| 4; 5; 6 |] |
| 128 | + chunks.[0].[0] |> should equal 99 |
| 129 | + } |
| 130 | + |
| 131 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 132 | + let ``TaskSeq-chunkBySize remainder sizes`` variant = task { |
| 133 | + let verifyLastChunkSize chunkSize expectedLast = |
| 134 | + Gen.getSeqImmutable variant |
| 135 | + |> TaskSeq.chunkBySize chunkSize |
| 136 | + |> TaskSeq.toArrayAsync |
| 137 | + |> Task.map (Array.last >> Array.length >> should equal expectedLast) |
| 138 | + |
| 139 | + do! verifyLastChunkSize 3 1 // 10 mod 3 = 1 |
| 140 | + do! verifyLastChunkSize 4 2 // 10 mod 4 = 2 |
| 141 | + do! verifyLastChunkSize 6 4 // 10 mod 6 = 4 |
| 142 | + do! verifyLastChunkSize 7 3 // 10 mod 7 = 3 |
| 143 | + do! verifyLastChunkSize 9 1 // 10 mod 9 = 1 |
| 144 | + } |
| 145 | + |
| 146 | +module SideEffects = |
| 147 | + [<Theory; ClassData(typeof<TestSideEffectTaskSeq>)>] |
| 148 | + let ``TaskSeq-chunkBySize gets all items`` variant = |
| 149 | + Gen.getSeqWithSideEffect variant |
| 150 | + |> TaskSeq.chunkBySize 5 |
| 151 | + |> TaskSeq.toArrayAsync |
| 152 | + |> Task.map (should equal [| [| 1..5 |]; [| 6..10 |] |]) |
| 153 | + |
| 154 | + [<Fact>] |
| 155 | + let ``TaskSeq-chunkBySize executes side-effects from empty source`` () = task { |
| 156 | + let mutable sideEffects = 0 |
| 157 | + |
| 158 | + let ts = taskSeq { |
| 159 | + sideEffects <- sideEffects + 1 |
| 160 | + sideEffects <- sideEffects + 1 |
| 161 | + } |
| 162 | + |
| 163 | + do! ts |> TaskSeq.chunkBySize 1 |> consumeTaskSeq |
| 164 | + do! ts |> TaskSeq.chunkBySize 3 |> consumeTaskSeq |
| 165 | + sideEffects |> should equal 4 |
| 166 | + } |
| 167 | + |
| 168 | + [<Fact>] |
| 169 | + let ``TaskSeq-chunkBySize executes all source side-effects`` () = task { |
| 170 | + let mutable sideEffects = 0 |
| 171 | + |
| 172 | + let ts = taskSeq { |
| 173 | + sideEffects <- sideEffects + 1 |
| 174 | + yield 1 |
| 175 | + sideEffects <- sideEffects + 1 |
| 176 | + yield 2 |
| 177 | + sideEffects <- sideEffects + 1 // executed even after last yield |
| 178 | + } |
| 179 | + |
| 180 | + do! ts |> TaskSeq.chunkBySize 2 |> consumeTaskSeq |
| 181 | + sideEffects |> should equal 3 |
| 182 | + } |
| 183 | + |
| 184 | + [<Fact>] |
| 185 | + let ``TaskSeq-chunkBySize propagates exception from source`` () = |
| 186 | + let items = taskSeq { |
| 187 | + yield 1 |
| 188 | + yield 2 |
| 189 | + failwith "boom" |
| 190 | + yield 3 |
| 191 | + } |
| 192 | + |
| 193 | + fun () -> items |> TaskSeq.chunkBySize 2 |> consumeTaskSeq |
| 194 | + |> should throwAsyncExact typeof<System.Exception> |
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