Spelling: Remove deprecated --no-install, replace with --no (#9013)

* Spelling: Remove deprecated --no-install, replace with --no

* Extract testing, use npm exec instead of npx

* Move tests to eng/common-tests/

* Tag tests

* Ensure .vscode/cspell.json exists for tests

* Add git identity in cases where it's not already present (Windows)

* Disable unnecessary errors

* Cleanup, documentation

* More cleanup

* Update $command

eng/common-tests/spelling/Invoke-Cspell.Tests.ps1

@@ -0,0 +1,41 @@
+Describe 'Tool Version' {
+    BeforeAll {
+        $ShouldCleanUpVscodeDirectory = $false
+
+        $cspellConfigPath = "$PSScriptRoot/../../../.vscode/cspell.json"
+        if (!(Test-Path $cspellConfigPath)) {
+            $ShouldCleanUpVscodeDirectory = $true
+
+            $vscodeDirectory = Split-Path $cspellConfigPath -Parent
+            New-Item -ItemType Directory -Path $vscodeDirectory -Force | Out-Null
+            $configJsonContent = @"
+{
+    "version": "0.2",
+    "language": "en",
+    "ignorePaths": [
+        ".vscode/cspell.json",
+    ]
+}
+"@
+            $configJsonContent > $cspellConfigPath
+        }
+    }
+
+    AfterAll {
+        if ($ShouldCleanUpVscodeDirectory) {
+            Remove-Item -Path $vscodeDirectory -Recurse -Force | Out-Null
+        }
+    }
+
+    It 'Should have the correct version' -Tag 'UnitTest' {
+        # Arrange
+        $expectedPackageVersion = '6.31.2'
+
+        # Act
+        $actual = &"$PSScriptRoot/../../common/spelling/Invoke-Cspell.ps1" `
+            -JobType '--version'
+
+        # Assert
+        $actual | Should -Be $expectedPackageVersion
+    }
+}

eng/common-tests/spelling/check-spelling-in-changed-files.tests.ps1

@@ -0,0 +1,196 @@
+Describe 'Spell checking' -Tag 'UnitTest' {
+    BeforeAll {
+        $workingDirectory = Join-Path ([System.IO.Path]::GetTempPath()) ([System.IO.Path]::GetRandomFileName())
+
+        Write-Host "Create test temp dir: $workingDirectory"
+        New-Item -ItemType Directory -Force -Path $workingDirectory | Out-Null
+
+        Push-Location $workingDirectory | Out-Null
+        git init
+
+        # Set up git user information for this specific repo if no user
+        # information is set globally. Windows DevOps machines do not have a
+        # global git identity set.
+        if (!(git config --get user.email)) {
+            git config user.email "test@contoso.com"
+        }
+        if (!(git config --get user.name)) {
+            git config user.name "Test User"
+        }
+
+        New-Item -ItemType Directory -Force -Path "./excluded"
+        New-Item -ItemType Directory -Force -Path "./included"
+        New-Item -ItemType Directory -Force -Path "./.vscode"
+
+        "Placeholder" > "./excluded/placeholder.txt"
+        "Placeholder" > "./included/placeholder.txt"
+
+        $configJsonContent = @"
+{
+    "version": "0.2",
+    "language": "en",
+    "ignorePaths": [
+        ".vscode/cspell.json",
+        "excluded/**"
+    ]
+}
+"@
+        $configJsonContent > "./.vscode/cspell.json"
+
+        git add -A
+        git commit -m "Init"
+
+        # This forces normal Write-Error behavior (as seen on desktop) for
+        # errors encountered during testing of
+        # check-spelling-in-changed-files.ps1. Setting this keeps errors out of
+        # the DevOps logs for successful tests. Any errors produced by these
+        # tests are expected or will result in test failures.
+        $OriginalTeamProjectId = $env:SYSTEM_TEAMPROJECTID
+        $env:SYSTEM_TEAMPROJECTID = $null
+    }
+
+    AfterAll {
+        Pop-Location | Out-Null
+        Write-Host "Remove  test temp dir: $workingDirectory"
+        Remove-Item -Path $workingDirectory -Recurse -Force | Out-Null
+
+        $env:SYSTEM_TEAMPROJECTID = $OriginalTeamProjectId
+    }
+
+    BeforeEach {
+        $initCommit = git rev-parse HEAD
+    }
+
+    AfterEach {
+        # Empty out the working tree
+        git checkout .
+        git clean -xdf
+
+        $revCount = git rev-list --count HEAD
+        if ($revCount -gt 1) {
+            # Reset N-1 changes so there is only the initial commit
+            $revisionsToReset = $revCount - 1
+            git reset --hard HEAD~$revisionsToReset
+        }
+    }
+
+
+    It 'Exits 0 when all files are excluded' {
+        # Arrange
+        "sepleing errrrrorrrrr" > ./excluded/excluded-file.txt
+        git add -A
+        git commit -m "One change"
+
+        # Act
+        &"$PSScriptRoot/../../common/scripts/check-spelling-in-changed-files.ps1" `
+            -CspellConfigPath "./.vscode/cspell.json" `
+            -SpellCheckRoot "./" `
+            -ExitWithError `
+            -SourceCommittish (git rev-parse HEAD) `
+            -TargetCommittish $initCommit
+
+        # Assert
+        $LASTEXITCODE | Should -Be 0
+    }
+
+    It 'Exits 1 when included file has spelling error' {
+        # Arrange
+        "sepleing errrrrorrrrr" > ./included/included-file.txt
+        git add -A
+        git commit -m "One change"
+
+        # Act
+        &"$PSScriptRoot/../../common/scripts/check-spelling-in-changed-files.ps1" `
+            -CspellConfigPath "./.vscode/cspell.json" `
+            -SpellCheckRoot "./" `
+            -ExitWithError `
+            -SourceCommittish (git rev-parse HEAD) `
+            -TargetCommittish $initCommit
+
+        # Assert
+        $LASTEXITCODE | Should -Be 1
+    }
+
+    It 'Exits 0 when included file has no spelling error' {
+        # Arrange
+        "correct spelling" > ./included/included-file.txt
+        git add -A
+        git commit -m "One change"
+
+        # Act
+        &"$PSScriptRoot/../../common/scripts/check-spelling-in-changed-files.ps1" `
+            -CspellConfigPath "./.vscode/cspell.json" `
+            -SpellCheckRoot "./" `
+            -ExitWithError `
+            -SourceCommittish (git rev-parse HEAD) `
+            -TargetCommittish $initCommit
+
+        # Assert
+        $LASTEXITCODE | Should -Be 0
+    }
+
+    It 'Exits 1 when changed file already has spelling error' {
+        # Arrange
+        "sepleing errrrrorrrrr" > ./included/included-file.txt
+        git add -A
+        git commit -m "First change"
+
+        "A statement without spelling errors" >> ./included/included-file.txt
+        git add -A
+        git commit -m "Second change"
+
+        # Act
+        &"$PSScriptRoot/../../common/scripts/check-spelling-in-changed-files.ps1" `
+            -CspellConfigPath "./.vscode/cspell.json" `
+            -SpellCheckRoot "./" `
+            -ExitWithError `
+            -SourceCommittish (git rev-parse HEAD) `
+            -TargetCommittish $initCommit
+
+        # Assert
+        $LASTEXITCODE | Should -Be 1
+    }
+
+    It 'Exits 0 when unaltered file has spelling error' {
+        # Arrange
+        "sepleing errrrrorrrrr" > ./included/included-file-1.txt
+        git add -A
+        git commit -m "One change"
+
+        # Use baseCommit instead of initCommit to simulate a scenario where the
+        # file with the spelling error is already checked in.
+        $baseCommit = git rev-parse HEAD
+
+        "A statement without spelling errors" > ./included/included-file-2.txt
+        git add -A
+        git commit -m "Second change"
+
+        # Act
+        &"$PSScriptRoot/../../common/scripts/check-spelling-in-changed-files.ps1" `
+            -CspellConfigPath "./.vscode/cspell.json" `
+            -SpellCheckRoot "./" `
+            -ExitWithError `
+            -SourceCommittish (git rev-parse HEAD) `
+            -TargetCommittish $baseCommit
+
+        # Assert
+        $LASTEXITCODE | Should -Be 0
+    }
+
+    It 'Exits 0 when spelling errors and no ExitWithError' {
+        # Arrange
+        "sepleing errrrrorrrrr" > ./included/included-file-1.txt
+        git add -A
+        git commit -m "One change"
+
+        # Act
+        &"$PSScriptRoot/../../common/scripts/check-spelling-in-changed-files.ps1" `
+            -CspellConfigPath "./.vscode/cspell.json" `
+            -SpellCheckRoot "./" `
+            -SourceCommittish (git rev-parse HEAD) `
+            -TargetCommittish $initCommit
+
+        # Assert
+        $LASTEXITCODE | Should -Be 0
+    }
+}