[ci]: add vs tests (#6506)

Signed-off-by: Guohan Lu <lguohan@gmail.com>

azure-pipelines.yml

@@ -79,7 +79,8 @@ stages:
         trap "sudo rm -rf fsroot" EXIT
         make USERNAME=admin SONIC_BUILD_JOBS=$(nproc) $CACHE_OPTIONS \
             target/docker-sonic-vs.gz target/sonic-vs.img.gz && \
-            sudo cp target/sonic-vs.img.gz /nfs/azpl/kvmimage/sonic-vs.$(Build.BuildNumber).img.gz
+            sudo cp target/sonic-vs.img.gz /nfs/azpl/kvmimage/sonic-vs.$(Build.BuildNumber).img.gz && \
+            sudo cp target/docker-sonic-vs.gz /nfs/azpl/kvmimage/docker-sonic-vs.$(Build.BuildNumber).gz
       displayName: 'Build sonic image'
     - publish: $(System.DefaultWorkingDirectory)/
       artifact: sonic-buildimage.kvm
@@ -100,6 +101,45 @@ stages:
     value: ptf_vms6-1
 
   jobs:
+  - job:
+    displayName: "vstest"
+    timeoutInMinutes: 60
+    steps:
+    - checkout: self
+      submodules: recursive
+      displayName: 'Checkout code'
+
+    - task: DownloadPipelineArtifact@2
+      inputs:
+        source: specific
+        project: build
+        pipeline: 9
+        artifacts: sonic-swss-common.amd64.ubuntu20_04
+        runVersion: 'latestFromBranch'
+        runBranch: 'refs/heads/master'
+      displayName: "Download sonic swss common deb packages"
+
+    - script: |
+        sudo dpkg -i --force-confask,confnew ../sonic-swss-common.amd64.ubuntu20_04/libswsscommon_1.0.0_amd64.deb
+        sudo dpkg -i ../sonic-swss-common.amd64.ubuntu20_04/python3-swsscommon_1.0.0_amd64.deb
+        sudo docker load -i /nfs/azpl/kvmimage/docker-sonic-vs.$(Build.BuildNumber).gz
+        docker tag docker-sonic-vs:latest docker-sonic-vs:$(Build.BuildNumber)
+        username=$(id -un)
+
+        trap "docker ps; docker images; ip netns list; \
+              docker rmi docker-sonic-vs:$(Build.BuildNumber); \
+              ip netns list | grep -E [-]srv[0-9]+ | awk '{print $1}' | xargs -I {} sudo ip netns delete {}; \
+              sudo chown -R ${username}.${username} ." EXIT
+        pushd platform/vs/tests
+        sudo py.test -v --junitxml=tr.xml --imgname=docker-sonic-vs:$(Build.BuildNumber) && \
+            sudo rm /nfs/azpl/kvmimage/docker-sonic-vs.$(Build.BuildNumber).gz
+      displayName: "Run vs tests"
+
+    - task: PublishTestResults@2
+      inputs:
+        testResultsFiles: '**/tr.xml'
+        testRunTitle: vstest
+
   - job:
     displayName: "kvmtest"
     timeoutInMinutes: 240