From 05ed03154d91d17798eff370b9305190506f1893 Mon Sep 17 00:00:00 2001
From: Travis Plunk <travis.plunk@microsoft.com>
Date: Wed, 10 Jan 2018 16:37:51 -0800
Subject: [PATCH] tests: fix function to test for docker OS due to change to
 use linuxkit for mac (#5843)

* Also, fix syntax issues to allow to work with released Pester
---
 docker/tests/container.tests.ps1      |  6 ++----
 docker/tests/containerTestCommon.psm1 | 22 +++++++++++++++++++++-
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/docker/tests/container.tests.ps1 b/docker/tests/container.tests.ps1
index 0ee22870b0..456968e7dc 100644
--- a/docker/tests/container.tests.ps1
+++ b/docker/tests/container.tests.ps1
@@ -57,8 +57,7 @@ Describe "Linux Containers run PowerShell" -Tags 'Behavior', 'Linux' {
         # prune unused volumes
         $null=Invoke-Docker -Command 'volume', 'prune' -Params '--force' -SuppressHostOutput
     }
-    BeforeEach
-    {
+    BeforeEach {
         Remove-Item $testContext.resolvedXmlPath -ErrorAction SilentlyContinue
         Remove-Item $testContext.resolvedLogPath -ErrorAction SilentlyContinue
     }
@@ -82,8 +81,7 @@ Describe "Windows Containers run PowerShell" -Tags 'Behavior', 'Windows' {
     BeforeAll{
         $testContext = Get-TestContext -type Windows
     }
-    BeforeEach
-    {
+    BeforeEach {
         Remove-Item $testContext.resolvedXmlPath -ErrorAction SilentlyContinue
         Remove-Item $testContext.resolvedLogPath -ErrorAction SilentlyContinue
     }
diff --git a/docker/tests/containerTestCommon.psm1 b/docker/tests/containerTestCommon.psm1
index 37b3489172..7ce251166d 100644
--- a/docker/tests/containerTestCommon.psm1
+++ b/docker/tests/containerTestCommon.psm1
@@ -110,7 +110,27 @@ function Test-SkipWindows
 
 function Test-SkipLinux
 {
-    return !((Get-DockerEngineOs) -like 'Alpine Linux*')
+    $os = Get-DockerEngineOs
+
+    switch -wildcard ($os)
+    {
+        '*Linux*' {
+            return $false
+        }
+        '*Mac' {
+            return $false
+        }
+        # Docker for Windows means we are running the linux kernel
+        'Docker for Windows' {
+            return $false
+        }
+        'Windows*' {
+            return $true
+        }
+        default {
+            throw "Unknow docker os '$os'"
+        }
+    }
 }
 
 function Get-TestContext