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Fix GC test that is flaky on Linux #18408

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Merged
merged 1 commit into from
Mar 25, 2025
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Fix GC test that is flaky on Linux #18408

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18 changes: 16 additions & 2 deletions tests/FSharp.Compiler.Service.Tests/ProjectAnalysisTests.fs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
module FSharp.Compiler.Service.Tests.ProjectAnalysisTests

open System.Threading.Tasks

#nowarn "57" // Experimental stuff

let runningOnMono = try System.Type.GetType("Mono.Runtime") <> null with e -> false
Expand Down Expand Up @@ -128,8 +130,20 @@ module ClearLanguageServiceRootCachesTest =
let weakTcImports = test ()
checker.InvalidateConfiguration Project1.options
checker.ClearLanguageServiceRootCachesAndCollectAndFinalizeAllTransients()
GC.Collect()
System.Threading.SpinWait.SpinUntil(fun () -> not weakTcImports.IsAlive)

task {
GC.Collect()
GC.WaitForPendingFinalizers()
// Try collecting many times, because GC has some problems, especially on Linux.
// See for example: https://github.com/dotnet/runtime/discussions/108081
let mutable attempt = 1
while weakTcImports.IsAlive && attempt < 10 do
GC.Collect()
GC.WaitForPendingFinalizers()
attempt <- attempt + 1
do! Task.Delay(attempt * 1000)
Assert.False weakTcImports.IsAlive
}

[<Fact>]
let ``Test Project1 should have protected FullName and TryFullName return same results`` () =
Expand Down