Adding test pipeline for common-tests (#5040)

Our powershell scripts currently missed test coverage. The goal is trying to add test coverage as many as possible. The PR is to add test pipeline to cover all tests under `common-tests`

Testing pipeline: https://dev.azure.com/azure-sdk/internal/_build/results?buildId=2088942&view=logs&j=c7677f77-9c7a-5d06-5685-83acb5683895&t=358adba7-a1e6-5484-d654-f81d8812d6aa

doc/development/powershell.md

@@ -111,7 +111,7 @@ Unit tests should be written for all scripts, and should utilize [Pester](https:
 
 - Tests can be located alongside scripts in a directory called `tests`.
 - Example pester test suites: [job matrix tests](https://github.com/Azure/azure-sdk-tools/tree/main/eng/common/scripts/job-matrix/tests), [asset sync tests](https://github.com/Azure/azure-sdk-tools/blob/main/tools/asset-sync/assets.Tests.ps1)
-- A CI pipeline should be defined to run scripts unit tests at the very least. See [archetype-sdk-tool-pwsh](https://github.com/Azure/azure-sdk-tools/blob/main/eng/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml) for how to do this.
+- A CI pipeline should be defined to run scripts unit tests at the very least. See [archetype-sdk-tool-pwsh](https://github.com/Azure/azure-sdk-tools/blob/main/eng/common/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml) for how to do this.
 - Script code should always be written so as much of the surface area as possible can be run via unit tests. Move code that calls out to external dependencies into modular functions, and simplify context/data structures passed to functions as much as possible to it can be easily mocked.
 
 #### Running Pester Tests

eng/common-tests/ci.yml

@@ -0,0 +1,30 @@
+# NOTE: Please refer to https://aka.ms/azsdk/engsys/ci-yaml before editing this file.
+trigger:
+  branches:
+    include:
+      - main
+      - feature/*
+      - release/*
+      - hotfix/*
+  paths:
+    include:
+      - eng/common/scripts/*
+      - eng/common-tests/*
+
+pr:
+  branches:
+    include:
+      - main
+      - feature/*
+      - release/*
+      - hotfix/*
+  paths:
+    include:
+      - eng/common/scripts/*
+      - eng/common-tests/*
+
+extends:
+  template: /eng/common/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml
+  parameters:
+    TargetDirectory: eng/common-tests/
+    TargetTags: 'UnitTest'

eng/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml → eng/common/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml

@@ -15,10 +15,9 @@ variables:
   - template: /eng/pipelines/templates/variables/globals.yml
 
 stages:
-  - stage: 'Test'
+  - stage: 'eng_script_tests'
     jobs:
       - job: 'Test'
-
         strategy:
           matrix:
             Windows:
@@ -36,7 +35,7 @@ stages:
           vmImage: $(Image)
 
         steps:
-          - template: /eng/pipelines/templates/steps/run-pester-tests.yml
+          - template: /eng/common/pipelines/templates/steps/run-pester-tests.yml
             parameters:
               TargetDirectory: ${{ parameters.TargetDirectory }}
               CustomTestSteps: ${{ parameters.CustomTestSteps }}

tools/asset-sync/ci.yml

@@ -22,7 +22,7 @@ pr:
       - tools/asset-sync
 
 extends:
-  template: /eng/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml
+  template: /eng/common/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml
   parameters:
     TargetDirectory: tools/asset-sync/
     TargetTags: 'Unit'