diff -Nru ruby-specinfra-2.82.18/debian/changelog ruby-specinfra-2.82.19/debian/changelog
--- ruby-specinfra-2.82.18/debian/changelog	2020-08-10 12:21:36.000000000 +0000
+++ ruby-specinfra-2.82.19/debian/changelog	2020-08-26 07:30:40.000000000 +0000
@@ -1,3 +1,9 @@
+ruby-specinfra (2.82.19-1) unstable; urgency=medium
+
+  * New upstream version 2.82.19
+
+ -- HIGUCHI Daisuke (VDR dai) <dai@debian.org>  Wed, 26 Aug 2020 16:30:40 +0900
+
 ruby-specinfra (2.82.18-1) unstable; urgency=medium
 
   [ Debian Janitor ]
diff -Nru ruby-specinfra-2.82.18/lib/specinfra/backend/powershell/support/find_installed_gem.ps1 ruby-specinfra-2.82.19/lib/specinfra/backend/powershell/support/find_installed_gem.ps1
--- ruby-specinfra-2.82.18/lib/specinfra/backend/powershell/support/find_installed_gem.ps1	1970-01-01 00:00:00.000000000 +0000
+++ ruby-specinfra-2.82.19/lib/specinfra/backend/powershell/support/find_installed_gem.ps1	2020-08-26 07:29:32.000000000 +0000
@@ -0,0 +1,20 @@
+function FindInstalledGem
+{
+  param($gemName, $gemVersion)
+
+  $nameVer = $(Invoke-Expression "gem list --local" | Select-String "$gemName").Line
+  if ($nameVer.StartsWith($gemName)) {
+    if ($gemVersion) {
+      if ($nameVer.EndsWith("$gemVersion)")) {
+        $true
+      } else {
+        $false
+      }
+    } else {
+      $true
+    }
+  } else {
+    $false
+  }
+}
+
diff -Nru ruby-specinfra-2.82.18/lib/specinfra/command/windows/base/package.rb ruby-specinfra-2.82.19/lib/specinfra/command/windows/base/package.rb
--- ruby-specinfra-2.82.18/lib/specinfra/command/windows/base/package.rb	2020-07-16 22:21:36.000000000 +0000
+++ ruby-specinfra-2.82.19/lib/specinfra/command/windows/base/package.rb	2020-08-26 07:29:32.000000000 +0000
@@ -7,5 +7,13 @@
         exec "(FindInstalledApplication -appName '#{package}' #{version_selection}) -eq $true"
       end
     end
+
+    def check_is_installed_by_gem(name, version=nil, gem_binary="gem")
+      version_selection = version.nil? ? "" : "-gemVersion '#{version}'"
+      Backend::PowerShell::Command.new do
+        using 'find_installed_gem.ps1'
+        exec "(FindInstalledGem -gemName '#{name}' #{version_selection}) -eq $true"
+      end
+    end
   end
 end
diff -Nru ruby-specinfra-2.82.18/lib/specinfra/version.rb ruby-specinfra-2.82.19/lib/specinfra/version.rb
--- ruby-specinfra-2.82.18/lib/specinfra/version.rb	2020-07-16 22:21:36.000000000 +0000
+++ ruby-specinfra-2.82.19/lib/specinfra/version.rb	2020-08-26 07:29:32.000000000 +0000
@@ -1,3 +1,3 @@
 module Specinfra
-  VERSION = "2.82.18"
+  VERSION = "2.82.19"
 end