Debian and Ubuntu versioning and package name fixes

* Debian has a native nodejs dev package, so define that.

* Debian 10 has a native npm package, so define that for Debian 10.

* Improve native_debian_devel_package logic: support Debian 10 onward
  and Ubuntu 20.04 onward with the libnode-dev package name.

* After the above changes, the variable is_supported_debian_version
  becomes obsolete, so most of the tests can work normally. The only
  special case is Debian 9 lacking the native npm package.

manifests/params.pp

@@ -22,13 +22,21 @@
   case $facts['os']['family'] {
     'Debian': {
       if $facts['os']['release']['major'] =~ /^(9|10)$/ {
+        $debian_nodejs_dev_package_name = $facts['os']['release']['major'] ? {
+          '9'     => 'nodejs-dev',
+          default => 'libnode-dev',
+        }
+        $debian_npm_package_name = $facts['os']['release']['major'] ? {
+          '9'     => false,
+          default => 'npm',
+        }
         $manage_package_repo       = true
         $nodejs_debug_package_name = 'nodejs-dbg'
-        $nodejs_dev_package_name   = undef
+        $nodejs_dev_package_name   = $debian_nodejs_dev_package_name
         $nodejs_dev_package_ensure = 'absent'
         $nodejs_package_name       = 'nodejs'
         $npm_package_ensure        = 'absent'
-        $npm_package_name          = false
+        $npm_package_name          = $debian_npm_package_name
         $npm_path                  = '/usr/bin/npm'
         $repo_class                = '::nodejs::repo::nodesource'
       }

spec/classes/nodejs_spec.rb

@@ -9,14 +9,10 @@
         facts
       end
 
-      is_supported_debian_version = if facts[:os]['family'] == 'Debian' && %w[9 10].include?(facts[:os]['release']['major'])
-                                      true
-                                    else
-                                      false
-                                    end
-
-      native_debian_devel_package = if facts[:os]['name'] == 'Ubuntu' && facts[:os]['release']['major'] == '20.04'
-                                      'libnode-dev'
+      native_debian_devel_package = if facts[:os]['name'] == 'Ubuntu' && Gem::Version.new(facts[:os]['release']['major']) >= Gem::Version.new('20.04')
+                                        'libnode-dev'
+                                    elsif facts[:os]['name'] == 'Debian' && Gem::Version.new(facts[:os]['release']['major']) >= Gem::Version.new(10)
+                                        'libnode-dev'
                                     else
                                       'nodejs-dev'
                                     end
@@ -199,15 +195,8 @@
           }
         end
 
-        if is_supported_debian_version
-
-          it 'the nodejs development package resource should not be present' do
-            is_expected.not_to contain_package(native_debian_devel_package)
-          end
-        else
-          it 'the nodejs development package should be installed' do
-            is_expected.to contain_package(native_debian_devel_package).with('ensure' => 'present')
-          end
+        it 'the nodejs development package should be installed' do
+          is_expected.to contain_package(native_debian_devel_package).with('ensure' => 'present')
         end
       end
 
@@ -218,15 +207,8 @@
           }
         end
 
-        if is_supported_debian_version
-
-          it 'the nodejs development package resource should not be present' do
-            is_expected.not_to contain_package(native_debian_devel_package)
-          end
-        else
-          it 'the nodejs development package should not be present' do
-            is_expected.to contain_package(native_debian_devel_package).with('ensure' => 'absent')
-          end
+        it 'the nodejs development package should not be present' do
+          is_expected.to contain_package(native_debian_devel_package).with('ensure' => 'absent')
         end
       end
 
@@ -263,8 +245,8 @@
           }
         end
 
-        if is_supported_debian_version
-
+        # Debian 9 (stretch) doesn't have npm in the standard repositories (it has been backported though).
+        if facts[:os]['family'] == 'Debian' && facts[:os]['release']['major'] == '9'
           it 'the npm package resource should not be present' do
             is_expected.not_to contain_package('npm')
           end
@@ -282,8 +264,8 @@
           }
         end
 
-        if is_supported_debian_version
-
+        # Debian 9 (stretch) doesn't have npm in the standard repositories (it has been backported though).
+        if facts[:os]['family'] == 'Debian' && facts[:os]['release']['major'] == '9'
           it 'the npm package resource should not be present' do
             is_expected.not_to contain_package('npm')
           end