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| 1 | +module TaskSeq.Tests.ChooseV |
| 2 | + |
| 3 | +open System |
| 4 | + |
| 5 | +open Xunit |
| 6 | +open FsUnit.Xunit |
| 7 | + |
| 8 | +open FSharp.Control |
| 9 | + |
| 10 | +// |
| 11 | +// TaskSeq.chooseV |
| 12 | +// TaskSeq.chooseVAsync |
| 13 | +// |
| 14 | + |
| 15 | +module EmptySeq = |
| 16 | + [<Fact>] |
| 17 | + let ``Null source is invalid`` () = |
| 18 | + assertNullArg |
| 19 | + <| fun () -> TaskSeq.chooseV (fun _ -> ValueNone) null |
| 20 | + |
| 21 | + assertNullArg |
| 22 | + <| fun () -> TaskSeq.chooseVAsync (fun _ -> Task.fromResult ValueNone) null |
| 23 | + |
| 24 | + [<Theory; ClassData(typeof<TestEmptyVariants>)>] |
| 25 | + let ``TaskSeq-chooseV`` variant = task { |
| 26 | + let! empty = |
| 27 | + Gen.getEmptyVariant variant |
| 28 | + |> TaskSeq.chooseV (fun _ -> ValueSome 42) |
| 29 | + |> TaskSeq.toListAsync |
| 30 | + |
| 31 | + List.isEmpty empty |> should be True |
| 32 | + } |
| 33 | + |
| 34 | + [<Theory; ClassData(typeof<TestEmptyVariants>)>] |
| 35 | + let ``TaskSeq-chooseVAsync`` variant = task { |
| 36 | + let! empty = |
| 37 | + Gen.getEmptyVariant variant |
| 38 | + |> TaskSeq.chooseVAsync (fun _ -> task { return ValueSome 42 }) |
| 39 | + |> TaskSeq.toListAsync |
| 40 | + |
| 41 | + List.isEmpty empty |> should be True |
| 42 | + } |
| 43 | + |
| 44 | +module Immutable = |
| 45 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 46 | + let ``TaskSeq-chooseV can convert and filter`` variant = task { |
| 47 | + let chooser number = |
| 48 | + if number <= 5 then |
| 49 | + ValueSome(char number + '@') |
| 50 | + else |
| 51 | + ValueNone |
| 52 | + |
| 53 | + let ts = Gen.getSeqImmutable variant |
| 54 | + |
| 55 | + let! letters1 = TaskSeq.chooseV chooser ts |> TaskSeq.toArrayAsync |
| 56 | + let! letters2 = TaskSeq.chooseV chooser ts |> TaskSeq.toArrayAsync |
| 57 | + |
| 58 | + String letters1 |> should equal "ABCDE" |
| 59 | + String letters2 |> should equal "ABCDE" |
| 60 | + } |
| 61 | + |
| 62 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 63 | + let ``TaskSeq-chooseVAsync can convert and filter`` variant = task { |
| 64 | + let chooser number = task { |
| 65 | + return |
| 66 | + if number <= 5 then |
| 67 | + ValueSome(char number + '@') |
| 68 | + else |
| 69 | + ValueNone |
| 70 | + } |
| 71 | + |
| 72 | + let ts = Gen.getSeqImmutable variant |
| 73 | + |
| 74 | + let! letters1 = TaskSeq.chooseVAsync chooser ts |> TaskSeq.toArrayAsync |
| 75 | + let! letters2 = TaskSeq.chooseVAsync chooser ts |> TaskSeq.toArrayAsync |
| 76 | + |
| 77 | + String letters1 |> should equal "ABCDE" |
| 78 | + String letters2 |> should equal "ABCDE" |
| 79 | + } |
| 80 | + |
| 81 | +module Immutable2 = |
| 82 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 83 | + let ``TaskSeq-chooseV returns all when chooser always returns ValueSome`` variant = task { |
| 84 | + let ts = Gen.getSeqImmutable variant |
| 85 | + let! xs = ts |> TaskSeq.chooseV ValueSome |> TaskSeq.toArrayAsync |
| 86 | + xs |> should equal [| 1..10 |] |
| 87 | + } |
| 88 | + |
| 89 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 90 | + let ``TaskSeq-chooseVAsync returns all when chooser always returns ValueSome`` variant = task { |
| 91 | + let ts = Gen.getSeqImmutable variant |
| 92 | + |
| 93 | + let! xs = |
| 94 | + ts |
| 95 | + |> TaskSeq.chooseVAsync (fun x -> task { return ValueSome x }) |
| 96 | + |> TaskSeq.toArrayAsync |
| 97 | + |
| 98 | + xs |> should equal [| 1..10 |] |
| 99 | + } |
| 100 | + |
| 101 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 102 | + let ``TaskSeq-chooseV returns empty when chooser always returns ValueNone`` variant = task { |
| 103 | + let ts = Gen.getSeqImmutable variant |
| 104 | + |
| 105 | + do! ts |> TaskSeq.chooseV (fun _ -> ValueNone) |> verifyEmpty |
| 106 | + } |
| 107 | + |
| 108 | + [<Theory; ClassData(typeof<TestImmTaskSeq>)>] |
| 109 | + let ``TaskSeq-chooseVAsync returns empty when chooser always returns ValueNone`` variant = task { |
| 110 | + let ts = Gen.getSeqImmutable variant |
| 111 | + |
| 112 | + do! |
| 113 | + ts |
| 114 | + |> TaskSeq.chooseVAsync (fun _ -> task { return ValueNone }) |
| 115 | + |> verifyEmpty |
| 116 | + } |
| 117 | + |
| 118 | + [<Fact>] |
| 119 | + let ``TaskSeq-chooseV with singleton sequence and ValueSome chooser returns singleton`` () = task { |
| 120 | + let! xs = |
| 121 | + taskSeq { yield 42 } |
| 122 | + |> TaskSeq.chooseV (fun x -> ValueSome(x * 2)) |
| 123 | + |> TaskSeq.toListAsync |
| 124 | + |
| 125 | + xs |> should equal [ 84 ] |
| 126 | + } |
| 127 | + |
| 128 | + [<Fact>] |
| 129 | + let ``TaskSeq-chooseV with singleton sequence and ValueNone chooser returns empty`` () = |
| 130 | + taskSeq { yield 42 } |
| 131 | + |> TaskSeq.chooseV (fun _ -> ValueNone) |
| 132 | + |> verifyEmpty |
| 133 | + |
| 134 | + [<Fact>] |
| 135 | + let ``TaskSeq-chooseV can change the element type`` () = task { |
| 136 | + // choose maps int -> string voption, verifying type-changing behavior |
| 137 | + let chooser n = |
| 138 | + if n % 2 = 0 then |
| 139 | + ValueSome(sprintf "even-%d" n) |
| 140 | + else |
| 141 | + ValueNone |
| 142 | + |
| 143 | + let! xs = |
| 144 | + taskSeq { yield! [ 1..6 ] } |
| 145 | + |> TaskSeq.chooseV chooser |
| 146 | + |> TaskSeq.toListAsync |
| 147 | + |
| 148 | + xs |> should equal [ "even-2"; "even-4"; "even-6" ] |
| 149 | + } |
| 150 | + |
| 151 | + [<Fact>] |
| 152 | + let ``TaskSeq-chooseVAsync can change the element type`` () = task { |
| 153 | + let chooser n = task { |
| 154 | + return |
| 155 | + if n % 2 = 0 then |
| 156 | + ValueSome(sprintf "even-%d" n) |
| 157 | + else |
| 158 | + ValueNone |
| 159 | + } |
| 160 | + |
| 161 | + let! xs = |
| 162 | + taskSeq { yield! [ 1..6 ] } |
| 163 | + |> TaskSeq.chooseVAsync chooser |
| 164 | + |> TaskSeq.toListAsync |
| 165 | + |
| 166 | + xs |> should equal [ "even-2"; "even-4"; "even-6" ] |
| 167 | + } |
| 168 | + |
| 169 | +module SideEffects = |
| 170 | + [<Theory; ClassData(typeof<TestSideEffectTaskSeq>)>] |
| 171 | + let ``TaskSeq-chooseV applied multiple times`` variant = task { |
| 172 | + let ts = Gen.getSeqWithSideEffect variant |
| 173 | + |
| 174 | + let chooser x number = |
| 175 | + if number <= x then |
| 176 | + ValueSome(char number + '@') |
| 177 | + else |
| 178 | + ValueNone |
| 179 | + |
| 180 | + let! lettersA = ts |> TaskSeq.chooseV (chooser 5) |> TaskSeq.toArrayAsync |
| 181 | + let! lettersK = ts |> TaskSeq.chooseV (chooser 15) |> TaskSeq.toArrayAsync |
| 182 | + let! lettersU = ts |> TaskSeq.chooseV (chooser 25) |> TaskSeq.toArrayAsync |
| 183 | + |
| 184 | + String lettersA |> should equal "ABCDE" |
| 185 | + String lettersK |> should equal "KLMNO" |
| 186 | + String lettersU |> should equal "UVWXY" |
| 187 | + } |
| 188 | + |
| 189 | + [<Theory; ClassData(typeof<TestSideEffectTaskSeq>)>] |
| 190 | + let ``TaskSeq-chooseVAsync applied multiple times`` variant = task { |
| 191 | + let ts = Gen.getSeqWithSideEffect variant |
| 192 | + |
| 193 | + let chooser x number = task { |
| 194 | + return |
| 195 | + if number <= x then |
| 196 | + ValueSome(char number + '@') |
| 197 | + else |
| 198 | + ValueNone |
| 199 | + } |
| 200 | + |
| 201 | + let! lettersA = TaskSeq.chooseVAsync (chooser 5) ts |> TaskSeq.toArrayAsync |
| 202 | + let! lettersK = TaskSeq.chooseVAsync (chooser 15) ts |> TaskSeq.toArrayAsync |
| 203 | + let! lettersU = TaskSeq.chooseVAsync (chooser 25) ts |> TaskSeq.toArrayAsync |
| 204 | + |
| 205 | + String lettersA |> should equal "ABCDE" |
| 206 | + String lettersK |> should equal "KLMNO" |
| 207 | + String lettersU |> should equal "UVWXY" |
| 208 | + } |
| 209 | + |
| 210 | + [<Fact>] |
| 211 | + let ``TaskSeq-chooseV evaluates each source element exactly once`` () = task { |
| 212 | + let mutable count = 0 |
| 213 | + |
| 214 | + let ts = taskSeq { |
| 215 | + for i in 1..5 do |
| 216 | + count <- count + 1 |
| 217 | + yield i |
| 218 | + } |
| 219 | + |
| 220 | + let! xs = |
| 221 | + ts |
| 222 | + |> TaskSeq.chooseV (fun x -> if x < 3 then ValueSome x else ValueNone) |
| 223 | + |> TaskSeq.toListAsync |
| 224 | + |
| 225 | + count |> should equal 5 // all 5 elements were visited |
| 226 | + xs |> should equal [ 1; 2 ] |
| 227 | + } |
| 228 | + |
| 229 | + [<Fact>] |
| 230 | + let ``TaskSeq-chooseVAsync evaluates each source element exactly once`` () = task { |
| 231 | + let mutable count = 0 |
| 232 | + |
| 233 | + let ts = taskSeq { |
| 234 | + for i in 1..5 do |
| 235 | + count <- count + 1 |
| 236 | + yield i |
| 237 | + } |
| 238 | + |
| 239 | + let! xs = |
| 240 | + ts |
| 241 | + |> TaskSeq.chooseVAsync (fun x -> task { return if x < 3 then ValueSome x else ValueNone }) |
| 242 | + |> TaskSeq.toListAsync |
| 243 | + |
| 244 | + count |> should equal 5 |
| 245 | + xs |> should equal [ 1; 2 ] |
| 246 | + } |
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