Add support for unit testing via Unix OS

lib/puppet/provider/dsc_base_provider/dsc_base_provider.rb

@@ -1076,6 +1076,10 @@ def remove_secret_identifiers(text)
   def ps_manager
     debug_output = Puppet::Util::Log.level == :debug
     # TODO: Allow you to specify an alternate path, either to pwsh generally or a specific pwsh path.
-    Pwsh::Manager.instance(Pwsh::Manager.powershell_path, Pwsh::Manager.powershell_args, debug: debug_output)
+    if Pwsh::Util.on_windows?
+      Pwsh::Manager.instance(Pwsh::Manager.powershell_path, Pwsh::Manager.powershell_args, debug: debug_output)
+    else
+      Pwsh::Manager.instance(Pwsh::Manager.pwsh_path, Pwsh::Manager.pwsh_args, debug: debug_output)
+    end
   end
 end

lib/pwsh.rb

@@ -380,7 +380,7 @@ def self.pwsh_path(additional_paths = [])
           pwsh_paths << File.join(path, 'pwsh.exe') if File.exist?(File.join(path, 'pwsh.exe'))
         end
       else
-        search_paths.split(File::PATH_SEPARATOR).each do |path|
+        search_paths.split(':').each do |path|
           pwsh_paths << File.join(path, 'pwsh') if File.exist?(File.join(path, 'pwsh'))
         end
       end

lib/pwsh/util.rb

@@ -7,12 +7,12 @@ module Util
     module_function
 
     # Verifies whether or not the current context is running on a Windows node.
+    # Implementation copied from `facets`: https://github.com/rubyworks/facets/blob/main/lib/standard/facets/rbconfig.rb
     #
     # @return [Bool] true if on windows
     def on_windows?
-      # Ruby only sets File::ALT_SEPARATOR on Windows and the Ruby standard
-      # library uses that to test what platform it's on.
-      !!File::ALT_SEPARATOR
+      host_os = RbConfig::CONFIG['host_os']
+      !!(host_os =~ /mswin|mingw/)
     end
 
     # Verify paths specified are valid directories which exist.

spec/unit/puppet/provider/dsc_base_provider/dsc_base_provider_spec.rb

@@ -2110,21 +2110,44 @@
   end
 
   describe '.ps_manager' do
-    before do
-      allow(Pwsh::Manager).to receive(:powershell_path).and_return('pwsh')
-      allow(Pwsh::Manager).to receive(:powershell_args).and_return('args')
-    end
+    describe '.ps_manager on non-Windows' do
+      before do
+        allow(Pwsh::Util).to receive(:on_windows?).and_return(false)
+        allow(Pwsh::Manager).to receive(:pwsh_path).and_return('pwsh')
+        allow(Pwsh::Manager).to receive(:pwsh_args).and_return('args')
+      end
 
-    it 'Initializes an instance of the Pwsh::Manager' do
-      expect(Puppet::Util::Log).to receive(:level).and_return(:normal)
-      expect(Pwsh::Manager).to receive(:instance).with('pwsh', 'args', debug: false)
-      expect { provider.ps_manager }.not_to raise_error
+      it 'Initializes an instance of the Pwsh::Manager' do
+        expect(Puppet::Util::Log).to receive(:level).and_return(:normal)
+        expect(Pwsh::Manager).to receive(:instance).with('pwsh', 'args', debug: false)
+        expect { provider.ps_manager }.not_to raise_error
+      end
+
+      it 'passes debug as true if Puppet::Util::Log.level is debug' do
+        expect(Puppet::Util::Log).to receive(:level).and_return(:debug)
+        expect(Pwsh::Manager).to receive(:instance).with('pwsh', 'args', debug: true)
+        expect { provider.ps_manager }.not_to raise_error
+      end
     end
 
-    it 'passes debug as true if Puppet::Util::Log.level is debug' do
-      expect(Puppet::Util::Log).to receive(:level).and_return(:debug)
-      expect(Pwsh::Manager).to receive(:instance).with('pwsh', 'args', debug: true)
-      expect { provider.ps_manager }.not_to raise_error
+    describe '.ps_manager on Windows' do
+      before do
+        allow(Pwsh::Util).to receive(:on_windows?).and_return(true)
+        allow(Pwsh::Manager).to receive(:powershell_path).and_return('pwsh')
+        allow(Pwsh::Manager).to receive(:powershell_args).and_return('args')
+      end
+
+      it 'Initializes an instance of the Pwsh::Manager' do
+        expect(Puppet::Util::Log).to receive(:level).and_return(:normal)
+        expect(Pwsh::Manager).to receive(:instance).with('pwsh', 'args', debug: false)
+        expect { provider.ps_manager }.not_to raise_error
+      end
+
+      it 'passes debug as true if Puppet::Util::Log.level is debug' do
+        expect(Puppet::Util::Log).to receive(:level).and_return(:debug)
+        expect(Pwsh::Manager).to receive(:instance).with('pwsh', 'args', debug: true)
+        expect { provider.ps_manager }.not_to raise_error
+      end
     end
   end
 end