diff --git a/.github/workflows/rust.new.yml b/.github/workflows/rust.new.yml
index 316bf09fe..665e8c931 100644
--- a/.github/workflows/rust.new.yml
+++ b/.github/workflows/rust.new.yml
@@ -14,45 +14,133 @@ on:
 env:
   CARGO_TERM_COLOR: always
 
+defaults:
+  run:
+    shell: pwsh
+
 jobs:
-  build-linux-new:
+  linux-build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
-    - name: Install prerequisites
-      shell: pwsh
-      run: ./build.new.ps1 -SkipBuild -Clippy  -Verbose
-    - name: Build
-      shell: pwsh
-      run: ./build.new.ps1 -Clippy -Verbose
-    - name: Run tests
-      shell: pwsh
-      run: ./build.new.ps1 -Test -Verbose
-
-  build-windows-new:
-    runs-on: windows-latest
+      - uses: actions/checkout@v5
+      - name: Install prerequisites
+        run: ./build.new.ps1 -SkipBuild -Clippy  -Verbose
+      - name: Build
+        run: ./build.new.ps1 -Clippy -Verbose
+      - name: Run rust tests
+        run: ./build.new.ps1 -SkipBuild -Test -ExcludePesterTests -Verbose
+      - name:  Prepare build artifact
+        run:   tar -cvf bin.tar bin/
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: linux-bin
+          path: bin.tar
+  linux-pester:
+    needs: linux-build
+    strategy:
+      matrix:
+        group: [dsc, adapters, extensions, resources]
+    runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
-    - name: Install prerequisites
-      shell: pwsh
-      run: ./build.new.ps1 -SkipBuild -Clippy -Verbose
-    - name: Build
-      shell: pwsh
-      run: ./build.new.ps1 -Clippy -Verbose
-    - name: Run tests
-      shell: pwsh
-      run: ./build.new.ps1 -Test -Verbose
+      - uses: actions/checkout@v5
+      - name: Download build artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: linux-bin
+      - name:  Expand build artifact
+        run:   tar -xvf bin.tar
+      - name: Test ${{matrix.group}}
+        run: |-
+          $params = @{
+            SkipBuild        = $true
+            Test             = $true
+            ExcludeRustTests = $true
+            Verbose          = $true
+          }
+          ./build.new.ps1 @params -PesterTestGroup ${{matrix.group}}
 
-  build-macos-new:
+  macos-build:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Install prerequisites
+        run: ./build.new.ps1 -SkipBuild -Clippy  -Verbose
+      - name: Build
+        run: ./build.new.ps1 -Clippy -Verbose
+      - name: Run rust tests
+        run: ./build.new.ps1 -SkipBuild -Test -ExcludePesterTests -Verbose
+      - name:  Prepare build artifact
+        run:   tar -cvf bin.tar bin/
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: macos-bin
+          path: bin.tar
+  macos-pester:
+    needs: macos-build
+    strategy:
+      matrix:
+        group: [dsc, adapters, extensions, resources]
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v5
-    - name: Install prerequisites
-      shell: pwsh
-      run: ./build.new.ps1 -SkipBuild -Clippy -Verbose
-    - name: Build
-      shell: pwsh
-      run: ./build.new.ps1 -Clippy -Verbose
-    - name: Run tests
-      shell: pwsh
-      run: ./build.new.ps1 -Test -Verbose
+      - uses: actions/checkout@v5
+      - name: Download build artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: macos-bin
+      - name:  Expand build artifact
+        run:   tar -xvf bin.tar
+      - name: Test ${{matrix.group}}
+        run: |-
+          $params = @{
+            SkipBuild        = $true
+            Test             = $true
+            ExcludeRustTests = $true
+            Verbose          = $true
+          }
+          ./build.new.ps1 @params -PesterTestGroup ${{matrix.group}}
+
+  # Windows
+  windows-build:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Install prerequisites
+        run: ./build.new.ps1 -SkipBuild -Clippy  -Verbose
+      - name: Build
+        run: ./build.new.ps1 -Clippy -Verbose
+      - name: Run rust tests
+        run: ./build.new.ps1 -SkipBuild -Test -ExcludePesterTests -Verbose
+      - name: List bin folder files
+        run:  Get-ChildItem bin
+      - name:  Prepare build artifact
+        run:   tar -cvf bin.tar bin
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: windows-bin
+          path: bin.tar
+  windows-pester:
+    needs: windows-build
+    strategy:
+      matrix:
+        group: [dsc, adapters, extensions, resources]
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Download build artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: windows-bin
+      - name:  Expand build artifact
+        run:   tar -xvf bin.tar
+      - name: Test ${{matrix.group}}
+        run: |-
+          $params = @{
+            SkipBuild        = $true
+            Test             = $true
+            ExcludeRustTests = $true
+            Verbose          = $true
+          }
+          ./build.new.ps1 @params -PesterTestGroup ${{matrix.group}}
diff --git a/build.helpers.psm1 b/build.helpers.psm1
index e96dc6834..bbb575915 100644
--- a/build.helpers.psm1
+++ b/build.helpers.psm1
@@ -1274,6 +1274,9 @@ function Test-RustProject {
 function Test-ProjectWithPester {
     [cmdletbinding()]
     param(
+        [DscProjectDefinition[]]$Project,
+        [ValidateSet("dsc", "adapters", "extensions", "grammars", "resources")]
+        [string[]]$Group,
         [switch]$UsingADO
     )
 
@@ -1297,10 +1300,35 @@ function Test-ProjectWithPester {
 
             Write-Verbose "Updated Pester module location:`n`t$((Get-Module -Name Pester -ListAvailable).Path)"
         }
+        $pesterParams = @{
+            Output = 'Detailed'
+            ErrorAction = 'Stop'
+        }
+        if ($Project) {
+            $pesterParams.ExcludePath = $Project.RelativePath | Where-Object -FilterScript {
+                $_.Name -notin $Project.Name
+            }
+        }
+        if ($Group) {
+            $pesterParams.Path = $Group
+        }
     }
 
     process {
-        Invoke-Pester -Output Detailed -ErrorAction Stop
+        if ($Group -and $Project) {
+            Write-Verbose (@(
+                "Invoking pester for groups and projects:"
+                "Groups: [$($Group -join ', ')]"
+                "Projects: [$($Project.Name -join ', ')]"
+            ) -join "`n`t")
+        } elseif ($Group) {
+            Write-Verbose "Invoking pester for groups: [$($Group -join ', ')]"
+        } elseif ($Project) {
+            Write-Verbose "Invoking pester for projects: [$($Project.Name -join ', ')]"
+        } else {
+            Write-Verbose "Invoking pester for all groups and projects"
+        }
+        Invoke-Pester @pesterParams
     }
 }
 #endregion Test project functions
diff --git a/build.new.ps1 b/build.new.ps1
index b50a88050..dd697fe30 100644
--- a/build.new.ps1
+++ b/build.new.ps1
@@ -83,6 +83,11 @@ param(
     )]
     $PackageType,
     [switch]$Test,
+    [string[]]$Project,
+    [switch]$ExcludeRustTests,
+    [switch]$ExcludePesterTests,
+    [ValidateSet("dsc", "adapters", "extensions", "grammars", "resources")]
+    [string[]]$PesterTestGroup,
     [switch]$GetPackageVersion,
     [switch]$SkipLinkCheck,
     [switch]$UseX64MakeAppx,
@@ -110,7 +115,14 @@ begin {
     if ($usingADO -or $UseCFSAuth) {
         $UseCFS = $true
     }
+    # Import the build data
     $BuildData = Import-DscBuildData
+    # Filter projects if needed.
+    if ($Project.Count -ge 1) {
+        $BuildData.Projects = $BuildData.Projects | Where-Object -FilterScript {
+            $_.Name -in $Project
+        }
+    }
     $VerboseParam = @{}
     if ($VerbosePreference -eq 'Continue' -and -not $Quiet) {
         $VerboseParam.Verbose = $true
@@ -177,27 +189,29 @@ process {
             Write-BuildProgress @progressParams -Status 'Ensuring Rust is up-to-date'
             Update-Rust @VerboseParam
         }
-    
+
         if (!$usingADO) {
             Write-BuildProgress @progressParams -Status 'Setting RustUp to default channel'
             $rustup, $channel = Get-RustUp @VerboseParam
             & $rustup default stable
         }
-    
+
         if ($Clippy) {
             Write-BuildProgress @progressParams -Status 'Ensuring Clippy is available and updated'
             Install-Clippy -UseCFS:$UseCFS -Architecture $Architecture @VerboseParam
         }
+
+        if (-not ($SkipBuild -and $Test -and $ExcludeRustTests)) {
+            # Install Node if needed
+            Write-BuildProgress @progressParams -Status 'Ensuring Node.JS is available'
+            Install-NodeJS @VerboseParam
     
-        # Install Node if needed
-        Write-BuildProgress @progressParams -Status 'Ensuring Node.JS is available'
-        Install-NodeJS @VerboseParam
-    
-        # Ensure tree-sitter is installed
-        Write-BuildProgress @progressParams -Status 'Ensuring tree-sitter is available'
-        Install-TreeSitter -UseCFS:$UseCFS @VerboseParam
+            # Ensure tree-sitter is installed
+            Write-BuildProgress @progressParams -Status 'Ensuring tree-sitter is available'
+            Install-TreeSitter -UseCFS:$UseCFS @VerboseParam
+        }
     }
-    
+
     if (!$SkipBuild -and !$SkipLinkCheck -and $IsWindows) {
         Write-BuildProgress @progressParams -Status "Ensuring Windows C++ build tools are available"
         Install-WindowsCPlusPlusBuildTools @VerboseParam
@@ -220,29 +234,44 @@ process {
         Write-BuildProgress @progressParams -Status "Copying build artifacts"
         Copy-BuildArtifact @buildParams -ExecutableFile $BuildData.PackageFiles.Executable @VerboseParam
     }
-    
-    if (!$Clippy -and !$SkipBuild) {
+
+    # Ensure PATH includes the output artifacts after building and before testing.
+    if ((!$Clippy -and !$SkipBuild) -or $Test) {
         $progressParams.Activity = 'Updating environment variables'
         Write-BuildProgress @progressParams
         Update-PathEnvironment -Architecture $Architecture -Release:$Release @VerboseParam
     }
-    
+
     if ($Test) {
         $progressParams.Activity = 'Testing projects'
         Write-BuildProgress @progressParams
-        Write-BuildProgress @progressParams -Status "Installing PowerShell test prerequisites"
-        Install-PowerShellTestPrerequisite @VerboseParam -UsingAdo:$usingADO
-        $testParams = @{
-            Project      = $BuildData.Projects
-            Architecture = $Architecture
-            Release      = $Release
+        
+        if (-not $ExcludeRustTests) {
+            $rustTestParams = @{
+                Project      = $BuildData.Projects
+                Architecture = $Architecture
+                Release      = $Release
+            }
+            Write-BuildProgress @progressParams -Status "Testing Rust projects"
+            Test-RustProject @rustTestParams @VerboseParam
+        }
+        if (-not $ExcludePesterTests) {
+            $installParams = @{
+                UsingADO = $usingADO
+            }
+            $pesterParams = @{
+                UsingADO = $usingADO
+            }
+            if ($null -ne $PesterTestGroup) {
+                $pesterParams.Group = $PesterTestGroup
+            }
+            Write-BuildProgress @progressParams -Status "Installing PowerShell test prerequisites"
+            Install-PowerShellTestPrerequisite @installParams @VerboseParam
+            Write-BuildProgress @progressParams -Status "Invoking pester"
+            Test-ProjectWithPester @pesterParams @VerboseParam
         }
-        Write-BuildProgress @progressParams -Status "Testing Rust projects"
-        Test-RustProject @testParams @VerboseParam
-        Write-BuildProgress @progressParams -Status "Invoking pester"
-        Test-ProjectWithPester -UsingADO:$usingADO @VerboseParam
     }
-    
+
     if (-not [string]::IsNullOrEmpty($PackageType)) {
         $progressParams.Activity = "Packaging"
         $packageParams = @{