[tests] Fixes to improve helix test runs hitting docker soft limits for network subnets (#5694)

* [tests] Disable parallel test runs on helix

This would help with too many docker network subnets being allocated in
parallel, and thus hitting soft limits on the helix agents.

* [tests] Prune docker networks on helix agents before/after the runs

* [tests] Bump timeout for Aspire.Pomelo.EntityFrameworkCore.MySql.Tests to 20mins

* Address review feedback from @ joperezr

* fix typo

Author: radical

tests/Directory.Build.targets

@@ -8,6 +8,8 @@
     <VSTestRunSettingsFile Condition="'$(VSTestRunSettingsFile)' == ''">$(RunSettingsFilePath)</VSTestRunSettingsFile>
 
     <DeployRunSettingsFile Condition="'$(DeployRunSettingsFile)' == ''">true</DeployRunSettingsFile>
+    <!-- Use a separate xunit.runner.json for helix that disables parallel test runs -->
+    <XunitRunnerJson Condition="'$(XunitRunnerJson)' == '' and '$(ArchiveTests)' == 'true'">$(RepoRoot)tests\helix\xunit.runner.json</XunitRunnerJson>
     <XunitRunnerJson Condition="'$(XunitRunnerJson)' == ''">$(RepositoryEngineeringDir)testing\xunit.runner.json</XunitRunnerJson>
 
     <RunTestsOnHelix Condition="'$(RunTestsOnHelix)' == '' and ('$(IsTestProject)' == 'true' and '$(IsTestSupportProject)' != 'true')">true</RunTestsOnHelix>

tests/helix/send-to-helix-basictests.targets

@@ -29,11 +29,12 @@
 
     <ItemGroup>
       <_DefaultWorkItems Include="$(WorkItemArchiveWildCard)" />
-      <!-- runsettings timeout in ms, default to 10 mins -->
+      <!-- runsettings timeout in ms, default to 15 mins -->
       <_DefaultWorkItems TimeoutMs="900000" />
 
       <_DefaultWorkItems Condition="'%(FileName)' == 'Aspire.Hosting.Elasticsearch.Tests'" TimeoutMs="1200000" />
       <_DefaultWorkItems Condition="'%(FileName)' == 'Aspire.Hosting.Oracle.Tests'" TimeoutMs="1200000" />
+      <_DefaultWorkItems Condition="'%(FileName)' == 'Aspire.Pomelo.EntityFrameworkCore.MySql.Tests'" TimeoutMs="1200000" />
 
       <HelixWorkItem Include="@(_DefaultWorkItems -> '%(FileName)')">
         <PayloadArchive>%(Identity)</PayloadArchive>

tests/helix/send-to-helix-inner.proj

@@ -126,11 +126,13 @@
     <HelixPreCommand Include="$(_ShutdownDockerContainersCommand)" />
     <HelixPreCommand Include="docker volume ls" />
     <HelixPreCommand Include="$(_DeleteDockerVolumesCommand)" />
+    <HelixPreCommand Include="docker network prune -f" />
 
     <HelixPostCommand Include="docker container ls --all" />
     <HelixPostCommand Include="$(_ShutdownDockerContainersCommand)" />
     <HelixPostCommand Include="docker volume ls" />
     <HelixPostCommand Include="$(_DeleteDockerVolumesCommand)" />
+    <HelixPostCommand Include="docker network prune -f" />
   </ItemGroup>
 
   <ItemGroup>

tests/helix/xunit.runner.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://xunit.net/schema/current/xunit.runner.schema.json",
+  "longRunningTestSeconds": 120,
+  "parallelizeAssembly": false,
+  "parallelizeTestCollections": false
+}