tests: provide global vars distinguishing platforms

tests/run.rb

@@ -21,8 +21,12 @@ rescue
 end
 
 def setup
-  ENV[ /darwin/i.match(RUBY_PLATFORM) ? 'LANG' : 'LC_ALL' ] = 'en_US.UTF-8'
-  ENV['PATH']                                               = "../src:" + ENV['PATH']
+  $is_windows = %r{win|mingw}i.match(RUBY_PLATFORM)
+  $is_macos   = %r{darwin}i.match(RUBY_PLATFORM)
+  $is_linux   = !$is_windows && !$is_macos
+
+  ENV[ $is_macos ? 'LANG' : 'LC_ALL' ] = 'en_US.UTF-8'
+  ENV['PATH']                          = "../src:" + ENV['PATH']
 
   $config = read_build_config
 end

tests/test.d/controller.rb

@@ -19,8 +19,8 @@ class Controller
 
   def get_num_processors
     np = case RUBY_PLATFORM
-         when /darwin/ then `/usr/sbin/sysctl -n hw.availcpu`.to_i
-         else               `nproc`.to_i
+         when $is_macos then `/usr/sbin/sysctl -n hw.availcpu`.to_i
+         else                `nproc`.to_i
          end
     [ np, 0 ].max + 1
   end

tests/test.d/test.rb

@@ -12,16 +12,15 @@ class Test
     @debug_commands = Array.new
 
     # install md5 handler
-    case RUBY_PLATFORM
-      when /darwin/
-        @md5 = lambda do |name|
-          @debug_commands << "/sbin/md5 #{name}"
-          `/sbin/md5 #{name}`.chomp.gsub(/.*=\s*/, "")
-        end
-      else
-        @md5 = lambda do |name|
-          @debug_commands << "md5sum #{name}"
-          `md5sum #{name}`.chomp.gsub(/\s+.*/, "")
+    if $is_macos
+      @md5 = lambda do |name|
+        @debug_commands << "/sbin/md5 #{name}"
+        `/sbin/md5 #{name}`.chomp.gsub(/.*=\s*/, "")
+      end
+    else
+      @md5 = lambda do |name|
+        @debug_commands << "md5sum #{name}"
+        `md5sum #{name}`.chomp.gsub(/\s+.*/, "")
       end
     end
   end

tests/test.d/util.rb

@@ -42,8 +42,7 @@ class String
 end
 
 # install md5 handler
-case RUBY_PLATFORM
-when /darwin/
+if $is_macos
   def md5 name
     `/sbin/md5 #{name}`.chomp.gsub(/.*=\s*/, "")
   end