diff --git a/CHANGELOG.md b/CHANGELOG.md
index e36c277..5808ec5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,12 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-### Changed
-
-- Remove `SkipReason` from RSOP test cases due to resolved merge logic bug.
-
-## [0.41.0] - 2026-02-03
-
 ### Added
 
 - Add configurable `default_json_depth` setting in `Datum.yml` to
@@ -40,15 +34,34 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   RSOP.md.
 - Added AllNodes iteration examples for both flat and nested directory
   layouts in README.md, RSOP.md, and AboutDatum.md.
+- Support conditional `ResolutionPrecedence` entries using
+  `Datum.InvokeCommand` expressions (`[x= ... =]`). Entries that
+  evaluate to `$null` or empty strings are now silently skipped
+  instead of causing lookup errors.
+- Added knockout support for hashtable array items.
+- Added integration tests for environment variable resolution in
+  `ResolutionPrecedence` paths
+  ([#126](https://github.com/gaelcolas/datum/pull/126)).
 
 ### Changed
 
 - Rewrote README.md with structured sections, table of contents,
   installation guide, merge strategy reference, handler documentation,
   and public function catalogue.
+- Remove `SkipReason` from RSOP test cases due to resolved merge logic bug.
+- Adjusted integration tests for knockout of hashtable array items.
+- Adjusted integration tests for hashtable array merge behauvior 'Sum'.
+- Add integration test for conditional `ResolutionPrecedence` entry
+  using an InvokeCommand expression that returns a path for some nodes
+  and nothing for others.
 
 ### Fixed
 
+- Fixed `Join-Path` throwing `DriveNotFoundException` when
+  `ResolutionPrecedence` entries contain environment variable
+  references such as `$($env:VarName)`, by using
+  `[System.IO.Path]::Combine` instead
+  ([#126](https://github.com/gaelcolas/datum/pull/126)).
 - Fix `ConvertTo-Json` truncation warnings for deep data structures
   in `Merge-Datum`, `Merge-Hashtable`, and
   `Invoke-TestHandlerAction`
@@ -61,6 +74,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `$rsop.SomeKey.__source` pattern.
 - Documented `-IncludeSource`/`-RemoveSource` mutual exclusivity in
   RSOP.md and CmdletReference.md.
+- Fixed merging of hashtable array items using merge behaviour 'Sum'.
 
 ## [0.41.0] - 2026-02-03
 
diff --git a/docs/CmdletReference.md b/docs/CmdletReference.md
index 2df73af..e07b4ab 100644
--- a/docs/CmdletReference.md
+++ b/docs/CmdletReference.md
@@ -101,6 +101,11 @@ Resolve-Datum -PropertyPath 'Configurations' -Variable $Node -DatumTree $Datum
 | `PathPrefixes` | `[string[]]` | No | `$DatumTree.__Definition.ResolutionPrecedence` | Resolution paths. Alias: `SearchPaths` |
 | `MaxDepth` | `[int]` | No | From definition or `-1` | Maximum merge recursion depth |
 
+> **Note:** `PathPrefixes` are processed through configured datum
+> handlers before lookup begins. Entries that resolve to `$null` or
+> empty/whitespace strings (e.g. conditional `[x= ... =]` expressions)
+> are automatically removed from the search list.
+
 **Output:** `[System.Array]` — The resolved value(s).
 
 ---
diff --git a/docs/DatumYml.md b/docs/DatumYml.md
index 11b60c3..18355e8 100644
--- a/docs/DatumYml.md
+++ b/docs/DatumYml.md
@@ -156,6 +156,40 @@ Any property of the node hashtable can be referenced.
 
 > **Tip:** `$Node.Name` is the file name of the node data file (set automatically by the FileProvider). `$Node.NodeName` is typically set inside the data file itself, often using `'[x={ $Node.Name }=]'` via InvokeCommand to derive it from the file name.
 
+#### Conditional Entries with InvokeCommand
+
+Resolution paths are processed through configured datum handlers
+**before** lookup begins.  This means you can use
+`Datum.InvokeCommand` expressions (`[x= ... =]`) to include a path
+only when a condition is met:
+
+```yaml
+ResolutionPrecedence:
+  - AllNodes\$($Node.Environment)\$($Node.NodeName)
+  - Environment\$($Node.Environment)
+  - Roles\$($Node.Role)
+  - Baselines\Security
+  - |
+    '[x= {
+      if ($Node.Name -notlike "*file*")
+      {
+        "Somevalue"
+      }
+      else
+      {
+        # returns $null — entry is skipped
+      }
+    } =]'
+```
+
+When the expression returns `$null` or an empty string, the entry
+is silently removed from the search list for that node. This keeps
+the lookup clean without requiring separate precedence lists per
+node type.
+
+> **Note:** The multi-line YAML block-scalar syntax (`|`) is required
+> so the `[x= ... =]` marker spans multiple lines correctly.
+
 #### Path Format
 
 - Use **backslash** (`\`) as the path separator
diff --git a/memory-bank/activeContext.md b/memory-bank/activeContext.md
index a76ec16..383adef 100644
--- a/memory-bank/activeContext.md
+++ b/memory-bank/activeContext.md
@@ -1,28 +1,22 @@
 # Active Context
 
-## Current State (as of 2026-02-25)
-The project is on the `main` branch. Recent work has focused on **PR #154 improvements** — making the `ConvertFrom-Yaml` consolidation for JSON files more comprehensive with proper CHANGELOG categorization and integration tests for JSON/YAML equivalence.
+## Current State (as of 2026-03-07)
+The project is on the `feature/docs` branch. Recent work has focused on adding support for **conditional ResolutionPrecedence entries** using `Datum.InvokeCommand` expressions.
 
 ## Current Work Focus
 The project has **unreleased changes** (tracked in CHANGELOG.md under [Unreleased]) that include:
 
 ### Unreleased Features & Fixes
-1. **Knockout support for basetype arrays** — New feature allowing items to be removed from inherited arrays
-2. **Cleanup of knockout items** — Post-merge cleanup of knockout markers
-3. **Pester tests for credential handling** — New test coverage
-4. **ConvertTo-Datum fix** — Fixed returning `` when DatumHandler returns `False` (#139)
-5. **Merge-DatumArray fix** — Fixed not returning array when merged array contains single hashtable
-6. **Hashtable array merge fix** — Fixed items not merging when using datum handler for tuple keys (#155)
-7. **Copy-Object fixes** — Fixed and extended tests, PowerShell 7 compatibility
-8. **Pester 5 migration** — All integration tests migrated to Pester 5 syntax
-9. **Build system update** — Updated to Sampler 0.119.0-preview0005
-10. **Merge-DatumArray improvement** — Convert tuple key values to datum before merging
+1. **Conditional ResolutionPrecedence entries** — `Resolve-Datum` now filters out null/empty/whitespace path prefixes after datum handler invocation, enabling conditional `[x= ... =]` expressions in `ResolutionPrecedence` that can return nothing for certain nodes.
+2. **Integration test for conditional precedence** — Added InvokeCommand expression to test `Datum.yml` that conditionally includes a path only for non-file-server nodes.
+3. **SkipReason removal** — Removed `SkipReason` from RSOP test cases due to resolved merge logic bug.
 
 ## Recent Changes (Last Session)
-- Moved CHANGELOG entry for PR #154 from `Added` to `Changed` with expanded description and PR link
-- Created `tests/Integration/GetFileProviderData.tests.ps1` — 33 new tests for JSON/YAML equivalence
-- Created test data in `tests/Integration/assets/JsonYamlEquivalence/` (JSON + YAML pairs)
-- **Build result**: 191 passed, 0 failed, 3 skipped (pre-existing)
+- Added `Where-Object { -not [string]::IsNullOrWhiteSpace($_) }` filter in `Resolve-Datum.ps1` after `ConvertTo-Datum` handler processing of `$PathPrefixes`
+- Added conditional InvokeCommand expression to `tests/Integration/assets/DscWorkshopConfigData/Datum.yml`
+- Updated CHANGELOG.md with Added and Changed entries under [Unreleased]
+- Added "Conditional Entries with InvokeCommand" section to `docs/DatumYml.md`
+- Added PathPrefixes filtering note to `docs/CmdletReference.md`
 
 ## Next Steps
 - ~~**Fix Issue #136**~~: DONE — depth now configurable via `default_json_depth` in Datum.yml (default 4), 8 tests, zero truncation warnings. Build verified, all tests passing. Ready for PR.
diff --git a/memory-bank/techContext.md b/memory-bank/techContext.md
index 510eb02..e56d3bf 100644
--- a/memory-bank/techContext.md
+++ b/memory-bank/techContext.md
@@ -10,6 +10,22 @@
 - **Versioning**: GitVersion (Semantic Versioning)
 - **Package Distribution**: PowerShell Gallery
 
+## Running Tests
+**CRITICAL**: Never use the `runTests` tool or run Pester inside VS Code's integrated PowerShell session — it will hang VS Code. Always run tests in a **separate `pwsh` process**:
+
+```powershell
+# Full build + test (Sampler)
+pwsh -NoProfile -NonInteractive -Command "./build.ps1 -Tasks test"
+
+# Single test file
+pwsh -NoProfile -NonInteractive -Command "Invoke-Pester -Path './tests/Integration/Resolve-Datum.Tests.ps1' -Output Detailed"
+
+# With module pre-loaded (for integration tests that need the built module)
+pwsh -NoProfile -NonInteractive -Command "Import-Module ./output/datum/0.0.1/datum.psd1 -Force; Invoke-Pester -Path './tests/Integration/' -Output Detailed"
+```
+
+Use `run_in_terminal` with `isBackground = false` and a generous timeout (180000+ ms).
+
 ## Dependencies
 ### Runtime
 - `powershell-yaml` — YAML parsing (required module)
diff --git a/source/Private/Clear-DatumKnockout.ps1 b/source/Private/Clear-DatumKnockout.ps1
index 6b50850..9855c5e 100644
--- a/source/Private/Clear-DatumKnockout.ps1
+++ b/source/Private/Clear-DatumKnockout.ps1
@@ -117,28 +117,20 @@ function Clear-DatumKnockout
         {
             if ($strategy.merge_hash_array -match '^MostSpecific$|^First')
             {
-                return $ReferenceDatum
+                return , $ReferenceDatum
             }
 
             if ($knockoutPrefixMatcher = $strategy.merge_options.knockout_prefix)
             {
-                if ($tupleKeyNames = [string[]]$Strategy.merge_options.tuple_keys)
+                $knockoutPrefixMatcher = [regex]::Escape($Strategy.merge_options.knockout_prefix).Insert(0, '^')
+
+                if ($tupleKeyNames = [string[]]$strategy.merge_options.tuple_keys)
                 {
-                    $tupleKeyNames += $tupleKeyNames.ForEach{ $strategy.merge_options.knockout_prefix + $_ }
                     $knockoutItems = foreach ($refItem in $ReferenceDatum)
                     {
-                        $refItemTupleKeys = $refItem.Keys.Where{ $_ -in $tupleKeyNames }
-                        if ($refItemTupleKeys -match $knockoutPrefixMatcher)
+                        if ($refItem.Keys.Where{ $_ -in $tupleKeyNames -and $refItem[$_] -match $knockoutPrefixMatcher })
                         {
                             $refItem
-                            $filterScript = @()
-                            foreach ($refItemTupleKey in $refItemTupleKeys)
-                            {
-                                $refItemTupleKeyWithoutKnockoutPrefix = $refItemTupleKey -replace $knockoutPrefixMatcher, ''
-                                $filterScript += "`$_.$refItemTupleKeyWithoutKnockoutPrefix -eq '$($refItem."$refItemTupleKey")'"
-                            }
-                            $filterScript = [scriptblock]::Create($filterScript -join ' -and ')
-                            $ReferenceDatum.Where{ &$filterScript }
                         }
                     }
                     foreach ($knockoutItem in $knockoutItems)
@@ -148,19 +140,19 @@ function Clear-DatumKnockout
                 }
             }
 
-            $cleanedArray = [System.Collections.ArrayList]::new()
-
-            foreach ($currentItem in $ReferenceDatum)
-            {
-                $cleanupItemParams = @{
-                    StartingPath   = $StartingPath
-                    ReferenceDatum = $currentItem
-                    Strategies     = $Strategies
+            $cleanedArray = @(
+                foreach ($currentItem in $ReferenceDatum)
+                {
+                    $cleanupItemParams = @{
+                        StartingPath   = $StartingPath
+                        ReferenceDatum = $currentItem
+                        Strategies     = $Strategies
+                    }
+                    Clear-DatumKnockout @cleanupItemParams
                 }
-                $null = $cleanedArray.Add((Clear-DatumKnockout @cleanupItemParams))
-            }
+            )
 
-            return (, $cleanedArray)
+            return , $cleanedArray
         }
 
         default
diff --git a/source/Private/Merge-DatumArray.ps1 b/source/Private/Merge-DatumArray.ps1
index 6668809..e5cfc0c 100644
--- a/source/Private/Merge-DatumArray.ps1
+++ b/source/Private/Merge-DatumArray.ps1
@@ -27,7 +27,6 @@ function Merge-DatumArray
     )
 
     Write-Debug -Message "`tMerge-DatumArray -StartingPath <$StartingPath>"
-    $knockout_prefix = [regex]::Escape($Strategy.merge_options.knockout_prefix).Insert(0, '^')
     $hashArrayStrategy = $Strategy.merge_hash_array
     Write-Debug -Message "`t`tHash Array Strategy: $hashArrayStrategy"
     $mergeBasetypeArraysStrategy = $Strategy.merge_basetype_array
@@ -53,12 +52,52 @@ function Merge-DatumArray
             return $mergedArray
         }
 
+        $knockedOutTupleKeyValues = [System.Collections.ArrayList]@()
+        foreach ($referenceItem in $ReferenceArray)
+        {
+            $currentRefItem = [ordered]@{} + $referenceItem
+
+            # make sure property values are converted before merge
+            $result = $null
+            foreach ($prop in $propertyNames.Where{ $currentRefItem.Contains($_) })
+            {
+                if (Invoke-DatumHandler -InputObject $currentRefItem[$prop] -DatumHandlers $Datum.__Definition.DatumHandlers -Result ([ref]$result))
+                {
+                    $currentRefItem[$prop] = ConvertTo-Datum -InputObject $result -DatumHandlers $Datum.__Definition.DatumHandlers
+                }
+            }
+
+            if ($knockoutPrefixMatcher = $Strategy.merge_options.knockout_prefix)
+            {
+                $knockoutPrefixMatcher = [regex]::Escape($Strategy.merge_options.knockout_prefix).Insert(0, '^')
+
+                if ($tupleKeyNames = [string[]]$strategy.merge_options.tuple_keys)
+                {
+                    if ($currentRefItemKeysWithKnockOutValues = $currentRefItem.Keys.Where{ $_ -in $tupleKeyNames -and $currentRefItem[$_] -match $knockoutPrefixMatcher })
+                    {
+                        $ht = @{}
+                        foreach ($key in $currentRefItemKeysWithKnockOutValues)
+                        {
+                            $ht.$key = $currentRefItem.$key -replace $knockoutPrefixMatcher
+                        }
+
+                        $null = $knockedOutTupleKeyValues.Add($ht)
+                    }
+                }
+            }
+        }
+
         switch -Regex ($hashArrayStrategy)
         {
             '^Sum|^Add'
             {
-                (@($DifferenceArray) + @($ReferenceArray)) | ForEach-Object {
-                    $null = $mergedArray.Add(([ordered]@{} + $_))
+                foreach ($referenceItem in $ReferenceArray)
+                {
+                    $null = $mergedArray.Add(([ordered]@{} + $referenceItem))
+                }
+                foreach ($differenceItem in $DifferenceArray)
+                {
+                    $null = $mergedArray.Add(([ordered]@{} + $differenceItem))
                 }
             }
 
@@ -74,7 +113,7 @@ function Merge-DatumArray
                 #    if not found, add $DiffItem to $RefArray
 
                 # look at each $RefItems in $RefArray
-                $usedDiffItems = [System.Collections.ArrayList]::new()
+                $usedOrKnockedOutDiffItems = [System.Collections.ArrayList]@()
                 foreach ($referenceItem in $ReferenceArray)
                 {
                     $referenceItem = [ordered]@{} + $referenceItem
@@ -85,18 +124,6 @@ function Merge-DatumArray
                         Write-Debug -Message "`t`t`t ..No PropertyName defined: Use ReferenceItem Keys"
                         $propertyNames = $referenceItem.Keys
                     }
-                    # make sure property values are converted before merge
-                    $result = $null
-                    foreach ($prop in $propertyNames)
-                    {
-                        if ($referenceItem.Contains($prop))
-                        {
-                            if (Invoke-DatumHandler -InputObject $referenceItem.$prop -DatumHandlers $Datum.__Definition.DatumHandlers -Result ([ref]$result))
-                            {
-                                $referenceItem.$prop = ConvertTo-Datum -InputObject $result -DatumHandlers $Datum.__Definition.DatumHandlers
-                            }
-                        }
-                    }
                     $mergedItem = @{} + $referenceItem
                     $diffItemsToMerge = $DifferenceArray.Where{
                         $differenceItem = [ordered]@{} + $_
@@ -112,13 +139,31 @@ function Merge-DatumArray
                                 }
                             }
                         }
-                        # Search for DiffItem that has the same Property/Value pairs than RefItem
-                        $compareHashParams = @{
-                            ReferenceHashtable  = [ordered]@{} + $referenceItem
-                            DifferenceHashtable = $differenceItem
-                            Property            = $propertyNames
+                        $itemKnockedOut = $false
+                        foreach ($knockedOutTupleKeyValue in $knockedOutTupleKeyValues)
+                        {
+                            $filterStrings = foreach ($knockedOutTupleKeyValueKey in $knockedOutTupleKeyValue.Keys)
+                            {
+                                "`$knockedOutTupleKeyValue.'$knockedOutTupleKeyValueKey' -eq `$differenceItem.'$knockedOutTupleKeyValueKey'"
+                            }
+                            $filterScript = [scriptblock]::Create($filterStrings -join ' -and ')
+                            if ( &$filterScript )
+                            {
+                                $null = $usedOrKnockedOutDiffItems.Add($_)
+                                $itemKnockedOut = $true
+                                break
+                            }
+                        }
+                        if ($itemKnockedOut -eq $false)
+                        {
+                            # Search for DiffItem that has the same Property/Value pairs than RefItem
+                            $compareHashParams = @{
+                                ReferenceHashtable  = [ordered]@{} + $referenceItem
+                                DifferenceHashtable = $differenceItem
+                                Property            = $propertyNames
+                            }
+                            (-not (Compare-Hashtable @compareHashParams))
                         }
-                        (-not (Compare-Hashtable @compareHashParams))
                     }
                     Write-Debug -Message "`t`t`t ..Items to merge: $($diffItemsToMerge.Count)"
                     $diffItemsToMerge | ForEach-Object {
@@ -132,11 +177,11 @@ function Merge-DatumArray
                         $mergedItem = Merge-Hashtable @mergeItemsParams
                     }
                     # If a diff Item has been used, save it to find the unused ones
-                    $null = $usedDiffItems.AddRange($diffItemsToMerge)
+                    $null = $usedOrKnockedOutDiffItems.AddRange($diffItemsToMerge)
                     $null = $mergedArray.Add($mergedItem)
                 }
                 $unMergedItems = $DifferenceArray | ForEach-Object {
-                    if (-not $usedDiffItems.Contains($_))
+                    if (-not $usedOrKnockedOutDiffItems.Contains($_))
                     {
                         ([ordered]@{} + $_)
                     }
@@ -173,7 +218,7 @@ function Merge-DatumArray
 
                 $mergedArray = [System.Collections.ArrayList]::new()
                 $ReferenceArray | ForEach-Object {
-                    $currentRefItem = $_
+                    $currentRefItem = [ordered]@{} + $_
                     # make sure property values are converted before merge
                     $result = $null
                     foreach ($prop in $propertyNames)
@@ -193,7 +238,7 @@ function Merge-DatumArray
                 }
 
                 $DifferenceArray | ForEach-Object {
-                    $currentDiffItem = $_
+                    $currentDiffItem = [ordered]@{} + $_
                     # make sure property values are converted before merge
                     $result = $null
                     foreach ($prop in $propertyNames)
@@ -206,9 +251,26 @@ function Merge-DatumArray
                             }
                         }
                     }
-                    if (-not ($mergedArray.Where{ -not (Compare-Hashtable -Property $propertyNames -ReferenceHashtable $currentDiffItem -DifferenceHashtable $_ ) }))
+                    $itemKnockedOut = $false
+                    foreach ($knockedOutTupleKeyValue in $knockedOutTupleKeyValues)
                     {
-                        $null = $mergedArray.Add(([ordered]@{} + $_))
+                        $filterStrings = foreach ($knockedOutTupleKeyValueKey in $knockedOutTupleKeyValue.Keys)
+                        {
+                            "`$knockedOutTupleKeyValue.'$knockedOutTupleKeyValueKey' -eq `$currentDiffItem.'$knockedOutTupleKeyValueKey'"
+                        }
+                        $filterScript = [scriptblock]::Create($filterStrings -join ' -and ')
+                        if ( &$filterScript )
+                        {
+                            $itemKnockedOut = $true
+                            break
+                        }
+                    }
+                    if ($itemKnockedOut -eq $false)
+                    {
+                        if (-not ($mergedArray.Where{ -not (Compare-Hashtable -Property $propertyNames -ReferenceHashtable $currentDiffItem -DifferenceHashtable $_ ) }))
+                        {
+                            $null = $mergedArray.Add(([ordered]@{} + $_))
+                        }
                     }
                 }
             }
diff --git a/source/Public/Merge-Datum.ps1 b/source/Public/Merge-Datum.ps1
index a06501d..f74eb12 100644
--- a/source/Public/Merge-Datum.ps1
+++ b/source/Public/Merge-Datum.ps1
@@ -190,10 +190,7 @@ function Merge-Datum
                 '^Sum'
                 {
                     #--> $ref + $diff
-                    (@($DifferenceArray) + @($ReferenceArray)).Foreach{
-                        $null = $MergedArray.Add(([ordered]@{} + $_))
-                    }
-                    return (, $MergedArray)
+                    return (, (Merge-DatumArray @MergeDatumArrayParams))
                 }
 
                 Default
diff --git a/source/Public/Resolve-Datum.ps1 b/source/Public/Resolve-Datum.ps1
index 23890b6..8188883 100644
--- a/source/Public/Resolve-Datum.ps1
+++ b/source/Public/Resolve-Datum.ps1
@@ -173,6 +173,7 @@ function Resolve-Datum
 
     #Invoke datum handlers
     $PathPrefixes = $PathPrefixes | ConvertTo-Datum -DatumHandlers $datum.__Definition.DatumHandlers
+    $PathPrefixes = $PathPrefixes | Where-Object { -not [string]::IsNullOrWhiteSpace($_) }
 
     $allMergeResults = [System.Collections.Stack]::new()
     $Script:previousMergeResult = $null
diff --git a/tests/Integration/EnvVarResolution.tests.ps1 b/tests/Integration/EnvVarResolution.tests.ps1
new file mode 100644
index 0000000..f647b74
--- /dev/null
+++ b/tests/Integration/EnvVarResolution.tests.ps1
@@ -0,0 +1,56 @@
+using module datum
+
+Remove-Module -Name datum
+
+Describe 'Environment variable resolution in ResolutionPrecedence paths' {
+    BeforeAll {
+        $here = $PSScriptRoot
+        Import-Module -Name datum -Force
+
+        $env:DatumTestBaseline = 'TestBaseline'
+
+        $datumPath = Join-Path -Path $here -ChildPath 'assets\EnvVarResolutionTestData\Datum.yml'
+        if (-not (Test-Path $datumPath))
+        {
+            throw "Cannot find Datum.yml at: $datumPath (here = $here)"
+        }
+
+        $datum = New-DatumStructure -DefinitionFile $datumPath
+        $allNodes = @($datum.AllNodes.psobject.Properties | ForEach-Object {
+                $node = $datum.AllNodes.($_.Name)
+                (@{} + $node)
+            })
+    }
+
+    AfterAll {
+        Remove-Item -Path Env:\DatumTestBaseline -ErrorAction SilentlyContinue
+    }
+
+    Context 'ResolutionPrecedence entries with environment variables' {
+
+        It 'Should resolve a property from a baseline referenced via an environment variable' {
+            $myNode = $allNodes.Where({ $_.NodeName -eq 'TestNode01' })
+            $result = Resolve-Datum -PropertyPath 'TestSetting' -Variable $myNode -DatumTree $datum
+            $result | Should -Be 'BaselineValue'
+        }
+
+        It 'Should not throw a DriveNotFoundException when using $env: in ResolutionPrecedence' {
+            $myNode = $allNodes.Where({ $_.NodeName -eq 'TestNode01' })
+            { Resolve-Datum -PropertyPath 'TestSetting' -Variable $myNode -DatumTree $datum } | Should -Not -Throw
+        }
+
+        It 'Should resolve a property from a mid-path environment variable reference' {
+            $env:DatumTestRole = 'WebServer'
+            try
+            {
+                $myNode = $allNodes.Where({ $_.NodeName -eq 'TestNode01' })
+                $result = Resolve-Datum -PropertyPath 'RoleSetting' -Variable $myNode -DatumTree $datum
+                $result | Should -Be 'WebServerConfigValue'
+            }
+            finally
+            {
+                Remove-Item -Path Env:\DatumTestRole -ErrorAction SilentlyContinue
+            }
+        }
+    }
+}
diff --git a/tests/Integration/Merge.tests.ps1 b/tests/Integration/Merge.tests.ps1
index 5e3c18f..5b16d1e 100644
--- a/tests/Integration/Merge.tests.ps1
+++ b/tests/Integration/Merge.tests.ps1
@@ -53,21 +53,20 @@ Describe 'Merge ' {
                 PropertyPath = 'WindowsFeatures\Name'
                 Count        = 4
             }
-
             @{
                 Node         = 'DSCFile01'
                 PropertyPath = 'Configurations'
-                Count        = 3
+                Count        = 7
             }
             @{
                 Node         = 'DSCWeb01'
                 PropertyPath = 'Configurations'
-                Count        = 2
+                Count        = 6
             }
             @{
                 Node         = 'DSCWeb02'
                 PropertyPath = 'Configurations'
-                Count        = 3
+                Count        = 7
             }
         )
 
@@ -82,17 +81,17 @@ Describe 'Merge ' {
             @{
                 Node         = 'DSCFile01'
                 PropertyPath = 'Configurations'
-                Value        = 'NetworkIpConfigurationMerged', 'WindowsFeatures', 'FilesAndFolders'
+                Value        = 'FilesAndFolders', 'LocalUsers', 'NetworkIpConfigurationMerged', 'RegistryValues', 'SecurityOptions', 'SummaryConfig', 'WindowsFeatures'
             }
             @{
                 Node         = 'DSCWeb01'
                 PropertyPath = 'Configurations'
-                Value        = 'NetworkIpConfigurationMerged', 'WindowsFeatures'
+                Value        = 'LocalUsers', 'NetworkIpConfigurationMerged', 'RegistryValues', 'SecurityOptions', 'SummaryConfig', 'WindowsFeatures'
             }
             @{
                 Node         = 'DSCWeb02'
                 PropertyPath = 'Configurations'
-                Value        = 'NetworkIpConfigurationMerged', 'FilesAndFolders', 'WindowsFeatures'
+                Value        = 'FilesAndFolders', 'LocalUsers', 'NetworkIpConfigurationMerged', 'RegistryValues', 'SecurityOptions', 'SummaryConfig', 'WindowsFeatures'
             }
             @{
                 Node         = 'DSCFile01'
diff --git a/tests/Integration/Rsop.tests.ps1 b/tests/Integration/Rsop.tests.ps1
index 038dd82..d7a8b58 100644
--- a/tests/Integration/Rsop.tests.ps1
+++ b/tests/Integration/Rsop.tests.ps1
@@ -40,17 +40,17 @@ Describe "RSOP tests based on 'MergeTestData' test data" {
             @{
                 Node         = 'DSCFile01'
                 PropertyPath = 'Configurations'
-                Value        = 'NetworkIpConfigurationMerged', 'WindowsFeatures', 'FilesAndFolders'
+                Value        = 'FilesAndFolders', 'LocalUsers', 'NetworkIpConfigurationMerged', 'RegistryValues', 'SecurityOptions', 'SummaryConfig', 'WindowsFeatures'
             }
             @{
                 Node         = 'DSCWeb01'
                 PropertyPath = 'Configurations'
-                Value        = 'NetworkIpConfigurationMerged', 'WindowsFeatures'
+                Value        = 'LocalUsers', 'NetworkIpConfigurationMerged', 'RegistryValues', 'SecurityOptions', 'SummaryConfig', 'WindowsFeatures'
             }
             @{
                 Node         = 'DSCWeb02'
                 PropertyPath = 'Configurations'
-                Value        = 'NetworkIpConfigurationMerged', 'FilesAndFolders', 'WindowsFeatures'
+                Value        = 'FilesAndFolders', 'LocalUsers', 'NetworkIpConfigurationMerged', 'RegistryValues', 'SecurityOptions', 'SummaryConfig', 'WindowsFeatures'
             }
             @{
                 Node         = 'DSCFile01'
@@ -147,6 +147,78 @@ Describe "RSOP tests based on 'MergeTestData' test data" {
                 PropertyPath = 'NetworkIpConfigurationMerged.Interfaces.Count'
                 Value        = 4
             }
+            # DSCFile01 - LocalUsers - LocalAdmin
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'LocalUsers.Users.Where{$_.UserName -eq "LocalAdmin"}.Ensure'
+                Value        = 'Present'
+            }
+            # DSCFile01 - LocalUsers - Admin1
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'LocalUsers.Users.Where{$_.UserName -eq "Admin1"}.Ensure'
+                Value        = $null
+            }
+            # DSCFile01 - LocalUsers count
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'LocalUsers.Users.Count'
+                Value        = 1
+            }
+            # DSCFile01 - LocalUsers UserName's
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'LocalUsers.Users.UserName'
+                Value        = 'LocalAdmin'
+            }
+            # DSCFile01 - RegistryValues - DevicesPickerUserSvc - Start
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'RegistryValues.Values.Where{$_.Key -eq "HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc" -and $_.ValueName -eq "Start"}.Ensure'
+                Value        = $null
+            }
+            # DSCFile01 - RegistryValues - DevicesPickerUserSvc - UserServiceFlags
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'RegistryValues.Values.Where{$_.Key -eq "HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc" -and $_.ValueName -eq "UserServiceFlags"}.Ensure'
+                Value        = 'Present'
+            }
+            # DSCFile01 - RegistryValues count
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'RegistryValues.Values.Count'
+                Value        = 3
+            }
+            # DSCFile01 - RegistryValues UserName's
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'RegistryValues.Values.Key'
+                Value        = 'HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc', 'HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService', 'HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService'
+            }
+            # DSCFile01 - RegistryValues UserName's
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'RegistryValues.Values.ValueName'
+                Value        = 'UserServiceFlags', 'Start', 'UserServiceFlags'
+            }
+            # DSCFile01 - Accounts_Rename_administrator_account
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'SecurityOptions.Policies.Where{$_.Name -eq "Accounts_Rename_administrator_account"}.Accounts_Rename_administrator_account'
+                Value        = 'LocalAdmin'
+            }
+            # DSCFile01 - SummaryConfig count
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'SummaryConfig.SumItems.Count'
+                Value        = 3
+            }
+            # DSCFile01 - SummaryConfig ItemNumbers
+            @{
+                Node         = 'DSCFile01'
+                PropertyPath = 'SummaryConfig.SumItems.ItemNumber'
+                Value        = 1, 2, 3
+            }
             # DSCWeb01 - Ethernet 1
             @{
                 Node         = 'DSCWeb01'
@@ -158,6 +230,90 @@ Describe "RSOP tests based on 'MergeTestData' test data" {
                 PropertyPath = 'NetworkIpConfigurationMerged.Interfaces.Where{$_.InterfaceAlias -eq "Ethernet 1"}.Gateway'
                 Value        = $null
             }
+            # DSCWeb01 - Interface count
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'NetworkIpConfigurationMerged.Interfaces.Count'
+                Value        = 2
+            }
+            # DSCWeb01 - Ethernet 2
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'NetworkIpConfigurationMerged.Interfaces.Where{$_.InterfaceAlias -eq "Ethernet 2"}'
+                Value        = $null
+            }
+            # DSCWeb01 - LocalUsers - LocalAdmin
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'LocalUsers.Users.Where{$_.UserName -eq "LocalAdmin"}.Ensure'
+                Value        = $null
+            }
+            # DSCWeb01 - LocalUsers - Admin1
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'LocalUsers.Users.Where{$_.UserName -eq "Admin1"}.Ensure'
+                Value        = $null
+            }
+            # DSCWeb01 - LocalUsers count
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'LocalUsers.Users.Count'
+                Value        = 0
+            }
+            # DSCWeb01 - LocalUsers UserName's
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'LocalUsers.Users.UserName'
+                Value        = $null
+            }
+            # DSCWeb01 - RegistryValues - DevicesPickerUserSvc - Start
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'RegistryValues.Values.Where{$_.Key -eq "HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc" -and $_.ValueName -eq "Start"}.Ensure'
+                Value        = $null
+            }
+            # DSCWeb01 - RegistryValues - DevicesPickerUserSvc - UserServiceFlags
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'RegistryValues.Values.Where{$_.Key -eq "HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc" -and $_.ValueName -eq "UserServiceFlags"}.Ensure'
+                Value        = $null
+            }
+            # DSCWeb01 - RegistryValues count
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'RegistryValues.Values.Count'
+                Value        = 2
+            }
+            # DSCWeb01 - RegistryValues UserName's
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'RegistryValues.Values.Key'
+                Value        = 'HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService', 'HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService'
+            }
+            # DSCWeb01 - RegistryValues UserName's
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'RegistryValues.Values.ValueName'
+                Value        = 'Start', 'UserServiceFlags'
+            }
+            # DSCWeb01 - Accounts_Rename_administrator_account
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'SecurityOptions.Policies.Where{$_.Name -eq "Accounts_Rename_administrator_account"}.Accounts_Rename_administrator_account'
+                Value        = $null
+            }
+            # DSCWeb01 - SummaryConfig count
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'SummaryConfig.SumItems.Count'
+                Value        = 3
+            }
+            # DSCWeb01 - SummaryConfig ItemNumbers
+            @{
+                Node         = 'DSCWeb01'
+                PropertyPath = 'SummaryConfig.SumItems.ItemNumber'
+                Value        = 1, 2, 4
+            }
             # DSCWeb02 - Ethernet 1
             @{
                 Node         = 'DSCWeb02'
@@ -169,6 +325,90 @@ Describe "RSOP tests based on 'MergeTestData' test data" {
                 PropertyPath = 'NetworkIpConfigurationMerged.Interfaces.Where{$_.InterfaceAlias -eq "Ethernet 1"}.Gateway'
                 Value        = '192.168.10.50'
             }
+            # DSCWeb02 - Interface count
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'NetworkIpConfigurationMerged.Interfaces.Count'
+                Value        = 2
+            }
+            # DSCWeb02 - Ethernet 2
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'NetworkIpConfigurationMerged.Interfaces.Where{$_.InterfaceAlias -eq "Ethernet 2"}'
+                Value        = $null
+            }
+            # DSCWeb02 - LocalUsers - LocalAdmin
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'LocalUsers.Users.Where{$_.UserName -eq "LocalAdmin"}.Ensure'
+                Value        = 'Absent'
+            }
+            # DSCWeb02 - LocalUsers - Admin1
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'LocalUsers.Users.Where{$_.UserName -eq "Admin1"}.Ensure'
+                Value        = 'Present'
+            }
+            # DSCWeb02 - LocalUsers count
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'LocalUsers.Users.Count'
+                Value        = 2
+            }
+            # DSCWeb02 - LocalUsers UserName's
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'LocalUsers.Users.UserName'
+                Value        = 'LocalAdmin', 'Admin1'
+            }
+            # DSCWeb02 - RegistryValues - DevicesPickerUserSvc - Start
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'RegistryValues.Values.Where{$_.Key -eq "HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc" -and $_.ValueName -eq "Start"}.Ensure'
+                Value        = 'Absent'
+            }
+            # DSCWeb02 - RegistryValues - DevicesPickerUserSvc - UserServiceFlags
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'RegistryValues.Values.Where{$_.Key -eq "HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc" -and $_.ValueName -eq "UserServiceFlags"}.Ensure'
+                Value        =  $null
+            }
+            # DSCWeb02 - RegistryValues count
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'RegistryValues.Values.Count'
+                Value        = 3
+            }
+            # DSCWeb02 - RegistryValues UserName's
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'RegistryValues.Values.Key'
+                Value        = 'HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc', 'HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService', 'HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService'
+            }
+            # DSCWeb02 - RegistryValues UserName's
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'RegistryValues.Values.ValueName'
+                Value        = 'Start', 'Start', 'UserServiceFlags'
+            }
+            # DSCWeb02 - Accounts_Rename_administrator_account
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'SecurityOptions.Policies.Where{$_.Name -eq "Accounts_Rename_administrator_account"}.Accounts_Rename_administrator_account'
+                Value        = 'Admin1'
+            }
+            # DSCWeb02 - SummaryConfig count
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'SummaryConfig.SumItems.Count'
+                Value        = 2
+            }
+            # DSCWeb02 - SummaryConfig ItemNumbers
+            @{
+                Node         = 'DSCWeb02'
+                PropertyPath = 'SummaryConfig.SumItems.ItemNumber'
+                Value        = 1, 2
+            }
         )
 
         It "The value of Datum RSOP property '<PropertyPath>' for node '<Node>' should be '<Value>'." -ForEach $script:testCases {
diff --git a/tests/Integration/assets/DscWorkshopConfigData/Datum.yml b/tests/Integration/assets/DscWorkshopConfigData/Datum.yml
index a3c3f61..de21617 100644
--- a/tests/Integration/assets/DscWorkshopConfigData/Datum.yml
+++ b/tests/Integration/assets/DscWorkshopConfigData/Datum.yml
@@ -6,6 +6,17 @@ ResolutionPrecedence:
   - Baselines\Security
   - Baselines\$($Node.Baseline)
   - Baselines\DscLcm
+  - |
+    '[x= {
+      if ($node.Name -notlike "*file*")
+      {
+        'Somevalue'
+      }
+      else
+      {
+        #nothing
+      }
+    } =]'
 
 DatumHandlersThrowOnError: false
 DatumHandlers:
diff --git a/tests/Integration/assets/EnvVarResolutionTestData/AllNodes/TestNode01.yml b/tests/Integration/assets/EnvVarResolutionTestData/AllNodes/TestNode01.yml
new file mode 100644
index 0000000..2c9a999
--- /dev/null
+++ b/tests/Integration/assets/EnvVarResolutionTestData/AllNodes/TestNode01.yml
@@ -0,0 +1,3 @@
+NodeName: TestNode01
+Description: Test node for environment variable resolution
+Role: WebServer
diff --git a/tests/Integration/assets/EnvVarResolutionTestData/Baselines/TestBaseline.yml b/tests/Integration/assets/EnvVarResolutionTestData/Baselines/TestBaseline.yml
new file mode 100644
index 0000000..140104e
--- /dev/null
+++ b/tests/Integration/assets/EnvVarResolutionTestData/Baselines/TestBaseline.yml
@@ -0,0 +1 @@
+TestSetting: BaselineValue
diff --git a/tests/Integration/assets/EnvVarResolutionTestData/Datum.yml b/tests/Integration/assets/EnvVarResolutionTestData/Datum.yml
new file mode 100644
index 0000000..e2f44f8
--- /dev/null
+++ b/tests/Integration/assets/EnvVarResolutionTestData/Datum.yml
@@ -0,0 +1,6 @@
+ResolutionPrecedence:
+  - AllNodes\$($Node.NodeName)
+  - Roles\$($env:DatumTestRole)\Config
+  - Baselines\$($env:DatumTestBaseline)
+
+default_lookup_options: MostSpecific
diff --git a/tests/Integration/assets/EnvVarResolutionTestData/Roles/WebServer/Config.yml b/tests/Integration/assets/EnvVarResolutionTestData/Roles/WebServer/Config.yml
new file mode 100644
index 0000000..18b2856
--- /dev/null
+++ b/tests/Integration/assets/EnvVarResolutionTestData/Roles/WebServer/Config.yml
@@ -0,0 +1 @@
+RoleSetting: WebServerConfigValue
diff --git a/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb01.yml b/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb01.yml
index dc6a7e1..0046e1c 100644
--- a/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb01.yml
+++ b/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb01.yml
@@ -44,3 +44,9 @@ LcmConfig:
   ConfigurationRepositoryWeb:
     Server:
       ConfigurationNames: DSCWeb01
+
+SummaryConfig:
+  SumItems:
+    - ItemName: Item1
+      ItemNumber: 4
+      Decription: Item1 with number 4
diff --git a/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb02.yml b/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb02.yml
index 415a375..c1786cb 100644
--- a/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb02.yml
+++ b/tests/Integration/assets/MergeTestData/AllNodes/DSCWeb02.yml
@@ -12,6 +12,18 @@ WindowsFeatures:
 Configurations:
   - FilesAndFolders
 
+LocalUsers:
+  Users:
+    - UserName: Admin1
+      Ensure: Present
+      Disabled: false
+      PasswordChangeRequired: false
+      PasswordNeverExpires: false
+    - UserName: LocalAdmin
+      Ensure: Absent
+  DependsOn:
+    - '[SecurityOption]secPolOpt_Accounts_Rename_administrator_account::[SecurityOptions]SecurityOptions'
+
 NetworkIpConfigurationMerged:
   Interfaces:
     - InterfaceAlias: Ethernet 1
@@ -22,6 +34,19 @@ NetworkIpConfigurationNonMerged:
     - InterfaceAlias: Ethernet 1
       IpAddress: 192.168.10.102
 
+RegistryValues:
+  Values:
+    - Key: HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc
+      ValueName: Start
+      Ensure: Absent
+      Force: true
+
+SecurityOptions:
+  Policies:
+  - Name: Accounts_Rename_administrator_account
+    Accounts_Rename_administrator_account: Admin1
+
+
 PSDscAllowPlainTextPassword: True
 PSDscAllowDomainUser: True
 
diff --git a/tests/Integration/assets/MergeTestData/Baselines/ServerBaseline.yml b/tests/Integration/assets/MergeTestData/Baselines/ServerBaseline.yml
index 93b5cb9..0dfec02 100644
--- a/tests/Integration/assets/MergeTestData/Baselines/ServerBaseline.yml
+++ b/tests/Integration/assets/MergeTestData/Baselines/ServerBaseline.yml
@@ -1,6 +1,10 @@
 Configurations:
   - WindowsFeatures
   - NetworkIpConfigurationMerged
+  - LocalUsers
+  - RegistryValues
+  - SecurityOptions
+  - SummaryConfig
 
 WindowsFeatures:
   Name:
@@ -39,3 +43,42 @@ NetworkIpConfigurationMerged:
 
 SecurityBase:
   Role: Baseline
+
+LocalUsers:
+  Users:
+    - UserName: LocalAdmin
+      Ensure: Present
+      Disabled: false
+      PasswordChangeRequired: false
+      PasswordNeverExpires: false
+  DependsOn:
+    - '[SecurityOption]secPolOpt_Accounts_Rename_administrator_account::[SecurityOptions]SecurityOptions'
+
+RegistryValues:
+  Values:
+    - Key: HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc
+      ValueName: Start
+      ValueData: 4
+      ValueType: Dword
+      Ensure: Present
+      Force: true
+    - Key: HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc
+      ValueName: UserServiceFlags
+      ValueData: 0
+      ValueType: Dword
+      Ensure: Present
+      Force: true
+
+SecurityOptions:
+  Policies:
+  - Name: Accounts_Rename_administrator_account
+    Accounts_Rename_administrator_account: LocalAdmin
+
+SummaryConfig:
+  SumItems:
+    - ItemName: Item1
+      ItemNumber: 1
+      Decription: Item1 with number 1
+    - ItemName: Item1
+      ItemNumber: 2
+      Decription: Item1 with number 2
diff --git a/tests/Integration/assets/MergeTestData/Datum.yml b/tests/Integration/assets/MergeTestData/Datum.yml
index 510b8d2..272a4b5 100644
--- a/tests/Integration/assets/MergeTestData/Datum.yml
+++ b/tests/Integration/assets/MergeTestData/Datum.yml
@@ -17,6 +17,15 @@ lookup_options:
     merge_options:
       knockout_prefix: --
 
+  LocalUsers:
+    merge_hash: deep
+  LocalUsers\Users:
+    merge_hash_array: DeepTuple
+    merge_options:
+      knockout_prefix: --
+      tuple_keys:
+        - UserName
+
   NetworkIpConfigurationMerged:
     merge_hash: deep
     merge_options:
@@ -31,3 +40,27 @@ lookup_options:
     merge_basetype_array: Unique
     merge_options:
       knockout_prefix: --
+
+  RegistryValues:
+    merge_hash: deep
+  RegistryValues\Values:
+    merge_hash_array: UniqueKeyValTuples
+    merge_options:
+      knockout_prefix: --
+      tuple_keys:
+        - Key
+        - ValueName
+
+  SecurityOptions:
+    merge_hash: deep
+  SecurityOptions\Policies:
+    merge_hash_array: UniqueKeyValTuples
+    merge_options:
+      knockout_prefix: --
+      tuple_keys:
+        - Name
+
+  SummaryConfig:
+    merge_hash: deep
+  SummaryConfig\SumItems:
+    merge_hash_array: Sum
diff --git a/tests/Integration/assets/MergeTestData/Roles/FileServer.yml b/tests/Integration/assets/MergeTestData/Roles/FileServer.yml
index b529a9d..18a4cba 100644
--- a/tests/Integration/assets/MergeTestData/Roles/FileServer.yml
+++ b/tests/Integration/assets/MergeTestData/Roles/FileServer.yml
@@ -31,3 +31,30 @@ NetworkIpConfigurationNonMerged:
       Gateway: 192.168.10.50
       DnsServer: 192.168.10.10
       DisableNetbios: True
+
+RegistryValues:
+  Values:
+    - Key: --HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc
+      ValueName: --Start
+      ValueData: 4
+      ValueType: Dword
+      Ensure: Present
+      Force: true
+    - Key: HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService
+      ValueName: Start
+      ValueData: 4
+      ValueType: Dword
+      Ensure: Present
+      Force: true
+    - Key: HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService
+      ValueName: UserServiceFlags
+      ValueData: 0
+      ValueType: Dword
+      Ensure: Present
+      Force: true
+
+SummaryConfig:
+  SumItems:
+    - ItemName: Item1
+      ItemNumber: 3
+      Decription: Item1 with number 3
diff --git a/tests/Integration/assets/MergeTestData/Roles/WebServer.yml b/tests/Integration/assets/MergeTestData/Roles/WebServer.yml
index 42e8e42..bb14fed 100644
--- a/tests/Integration/assets/MergeTestData/Roles/WebServer.yml
+++ b/tests/Integration/assets/MergeTestData/Roles/WebServer.yml
@@ -1,5 +1,7 @@
 Configurations:
   - WindowsFeatures
+  - NetworkIpConfigurationMerged
+  - LocalUsers
 
 WindowsFeatures:
   Name:
@@ -18,6 +20,7 @@ NetworkIpConfigurationMerged:
         - 192.168.12.0/24
         - 192.168.23.0/24
         - 192.168.34.0/24
+    - InterfaceAlias: --Ethernet 2
 
 NetworkIpConfigurationNonMerged:
   ConfigureIPv6: -1
@@ -27,3 +30,29 @@ NetworkIpConfigurationNonMerged:
       Gateway: 192.168.10.50
       DnsServer: 192.168.10.10
       DisableNetbios: True
+
+LocalUsers:
+  Users:
+    - UserName: --LocalAdmin
+  DependsOn:
+    - '--[SecurityOption]secPolOpt_Accounts_Rename_administrator_account::[SecurityOptions]SecurityOptions'
+
+RegistryValues:
+  Values:
+    - Key: --HKLM:\SYSTEM\CurrentControlSet\Services\DevicesPickerUserSvc
+    - Key: HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService
+      ValueName: Start
+      ValueData: 4
+      ValueType: Dword
+      Ensure: Present
+      Force: true
+    - Key: HKLM:\SYSTEM\CurrentControlSet\Services\CaptureService
+      ValueName: UserServiceFlags
+      ValueData: 0
+      ValueType: Dword
+      Ensure: Present
+      Force: true
+
+SecurityOptions:
+  Policies:
+    - Name: --Accounts_Rename_administrator_account