From 3de6b7d4266349f5cdfc136c77eafc6bc23b2931 Mon Sep 17 00:00:00 2001
From: davidseibel <>
Date: Wed, 15 Apr 2020 09:00:21 -0400
Subject: [PATCH 1/4] Replace test for using -ExcludeDifferent without
 -IncludeEqual

---
 .../Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1   | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1 b/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1
index 55819fba180..e37d0058f6f 100644
--- a/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1
+++ b/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1
@@ -76,10 +76,10 @@ Describe "Compare-Object" -Tags "CI" {
 	{ Compare-Object -ReferenceObject $(Get-Content $file3) -DifferenceObject $anonexistentvariable } | Should -Throw
     }
 
-    It "Should give a 0 array when using excludedifferent switch without also using the includeequal switch" {
-	$actualOutput = Compare-Object -ReferenceObject $(Get-Content $file3) -DifferenceObject $(Get-Content $file4) -ExcludeDifferent
+    It "Should only display equal lines when excludeDifferent switch is used without the includeequal switch" {
+    $actualOutput = Compare-Object -ReferenceObject $(Get-Content $file3) -DifferenceObject $(Get-Content $file4) -ExcludeDifferent
 
-	$actualOutput.Length | Should -Be 0
+    $actualOutput.Length | Should -Be 2
     }
 
     It "Should only display equal lines when excludeDifferent switch is used alongside the includeequal switch" {

From ea8a7848844910f193c21a5522998321280c283a Mon Sep 17 00:00:00 2001
From: davidseibel <>
Date: Wed, 15 Apr 2020 09:10:52 -0400
Subject: [PATCH 2/4] Create test for using -ExcludeDifferent switch with
 -IncludeEqual set to $false

---
 .../Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1 b/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1
index e37d0058f6f..3f8a521cb15 100644
--- a/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1
+++ b/test/powershell/Modules/Microsoft.PowerShell.Utility/Compare-Object.Tests.ps1
@@ -88,6 +88,12 @@ Describe "Compare-Object" -Tags "CI" {
 	$actualOutput.Length | Should -Be 2
     }
 
+    It "Should give a 0 array when using excludedifferent switch when also setting the includeequal switch to false" {
+	$actualOutput = Compare-Object -ReferenceObject $(Get-Content $file3) -DifferenceObject $(Get-Content $file4) -ExcludeDifferent -IncludeEqual:$false
+
+	$actualOutput.Length | Should -Be 0
+    }
+
     It "Should be able to pass objects to pipeline using the passthru switch" {
 	{ Compare-Object -ReferenceObject $(Get-Content $file3) -DifferenceObject $(Get-Content $file4) -Passthru | Format-Wide } | Should -Not -Throw
     }

From 78445871e29ea9a2187b69948a1d25df9a1c27db Mon Sep 17 00:00:00 2001
From: davidseibel <>
Date: Wed, 15 Apr 2020 09:12:19 -0400
Subject: [PATCH 3/4] Apply -IncludeEqual switch when -ExcludeDifferent is
 specified

---
 .../commands/utility/Compare-Object.cs                       | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs
index 5ee48da98de..4d896a46c89 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs
@@ -379,11 +379,6 @@ protected override void BeginProcessing()
         {
             if (ExcludeDifferent)
             {
-                if (_isIncludeEqualSpecified == false)
-                {
-                    return;
-                }
-
                 if (_isIncludeEqualSpecified && !_includeEqual)
                 {
                     return;

From b0f98f1c80a18310f1dd7eda211ba5224c314132 Mon Sep 17 00:00:00 2001
From: davidseibel <>
Date: Wed, 15 Apr 2020 09:50:41 -0400
Subject: [PATCH 4/4] Update comment to reflect new behavior

---
 .../commands/utility/Compare-Object.cs                        | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs
index 4d896a46c89..ae6e48180e5 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/Compare-Object.cs
@@ -372,8 +372,8 @@ private void Emit(OrderByPropertyEntry entry, string sideIndicator)
         #region Overrides
 
         /// <summary>
-        /// If the parameter 'ExcludeDifferent' is present, then we need to turn on the
-        /// 'IncludeEqual' switch unless it's turned off by the user specifically.
+        /// If the parameter 'ExcludeDifferent' is present, then the 'IncludeEqual'
+        /// switch is turned on unless it's turned off by the user specifically.
         /// </summary>
         protected override void BeginProcessing()
         {