Modify pipe tests for more clarity

Signed-off-by: Jerry Aldrich <jerryaldrichiii@gmail.com>

test/windows/local_test.rb

@@ -44,10 +44,13 @@
     # Must call `:conn` early so we can stub `SecureRandom`
     connection = conn
 
-    # Verify pipe is created by using PowerShell to check pipe location
+    # Verify pipe was created by using PowerShell to check pipe location. This
+    # works by intercepting the `SecureRandom` call which controls the pipe
+    # name. If this command uses a pipe, then the `stdout` of this command will
+    # not be `''`.
     SecureRandom.expects(:hex).returns('with_pipe')
     cmd = connection.run_command('Get-ChildItem //./pipe/ | Where-Object { $_.Name -Match "inspec_with_pipe" }')
-    cmd.stdout.wont_be_nil
+    cmd.stdout.wont_equal ''
     cmd.stderr.must_equal ''
   end
 
@@ -61,7 +64,10 @@
       .expects(:acquire_pipe)
       .returns(nil)
 
-    # Verify pipe was not created by using PowerShell to check pipe location
+    # Verify pipe was not created by using PowerShell to check pipe location.
+    # This works by intercepting the `SecureRandom` call which controls the pipe
+    # name. If this command doesn't find a pipe, then the `stdout` of the
+    # command will be `''`.
     SecureRandom.stubs(:hex).returns('minitest')
     cmd = connection.run_command('Get-ChildItem //./pipe/ | Where-Object { $_.Name -Match "inspec_minitest" }')
     cmd.stdout.must_equal ''