diff --git a/lib/train/extras/aix_file.rb b/lib/train/extras/aix_file.rb
index 9addab4d..e755f7f2 100644
--- a/lib/train/extras/aix_file.rb
+++ b/lib/train/extras/aix_file.rb
@@ -28,9 +28,9 @@ def link_path
       )
     end
 
-    def mounted?
+    def mounted
       @mounted ||= (
-        !@backend.run_command("lsfs -c #{@spath}").stdout.empty?
+        @backend.run_command("lsfs -c #{@spath}")
       )
     end
   end
diff --git a/lib/train/extras/file_common.rb b/lib/train/extras/file_common.rb
index 834c2bd1..247e9caf 100644
--- a/lib/train/extras/file_common.rb
+++ b/lib/train/extras/file_common.rb
@@ -102,6 +102,10 @@ def unix_mode_mask(owner, type)
       t & o
     end
 
+    def mounted?
+      !mounted.nil? && !mounted.stdout.nil? && !mounted.stdout.empty?
+    end
+
     # helper methods provided to any implementing class
 
     private
diff --git a/lib/train/extras/linux_file.rb b/lib/train/extras/linux_file.rb
index 3a0cda1b..36eb422d 100644
--- a/lib/train/extras/linux_file.rb
+++ b/lib/train/extras/linux_file.rb
@@ -43,10 +43,9 @@ def link_path
       )
     end
 
-    def mounted?
+    def mounted
       @mounted ||= (
-        !@backend.run_command("mount | grep -- ' on #{@spath}'")
-                 .stdout.empty?
+        @backend.run_command("mount | grep -- ' on #{@spath}'")
       )
     end
 
diff --git a/lib/train/extras/windows_file.rb b/lib/train/extras/windows_file.rb
index 8d5283af..33b1b72b 100644
--- a/lib/train/extras/windows_file.rb
+++ b/lib/train/extras/windows_file.rb
@@ -39,7 +39,7 @@ def link_path
       nil
     end
 
-    def mounted?
+    def mounted
       nil
     end
 
diff --git a/lib/train/transports/mock.rb b/lib/train/transports/mock.rb
index 9db8816e..bd5195cc 100644
--- a/lib/train/transports/mock.rb
+++ b/lib/train/transports/mock.rb
@@ -110,16 +110,22 @@ class Train::Transports::Mock::Connection
   class File < FileCommon
     %w{
       exist? mode owner group link_target link_path content mtime size
-      selinux_label product_version file_version path
-      type
+      selinux_label product_version file_version path type
     }.each do |m|
       attr_accessor m.tr('?', '').to_sym
     end
 
-    def initialize(_runtime, path)
+    def initialize(runtime, path)
       @path = path
       @type = :unknown
       @exist = false
+      @runtime = runtime
+    end
+
+    def mounted
+      @mounted ||= (
+        @runtime.run_command("mount | grep -- ' on #{@path}'")
+      )
     end
   end
 end