Add a spec for testing Middleman::Util#binary?

Rakefile

@@ -87,6 +87,13 @@ task :test do
   end
 end
 
+desc "Run specs for all middleman gems"
+task :spec do
+  GEM_PATHS.each do |g|
+    sh "cd #{File.join(ROOT, g)} && #{Gem.ruby} -S rake spec"
+  end
+end
+
 # desc "Rune cane for all middleman gems"
 # task :cane do
 #   GEM_PATHS.each do |g|

middleman-core/lib/middleman-core/util.rb

@@ -10,6 +10,9 @@ require "thor"
 # Core Pathname library used for traversal
 require "pathname"
 
+require "tilt"
+require "rack/mime"
+
 module Middleman
 
   module Util

middleman-core/spec/middleman-core/binary_spec.rb

@@ -0,0 +1,15 @@
+require 'middleman-core/util'
+
+describe "Middleman::Util#binary?" do
+  %w(plain.txt unicode.txt unicode stars.svgz).each do |file|
+    it "recognizes #{file} as not binary" do
+      Middleman::Util.binary?(File.join(File.dirname(__FILE__), "binary_spec/#{file}")).should be_false
+    end
+  end
+
+  %w(middleman.png middleman).each do |file|
+    it "recognizes #{file} as binary" do
+      Middleman::Util.binary?(File.join(File.dirname(__FILE__), "binary_spec/#{file}")).should be_true
+    end
+  end
+end

middleman-core/spec/middleman-core/binary_spec/plain.txt

@@ -0,0 +1 @@
+Some plain text

middleman-core/spec/middleman-core/binary_spec/unicode

@@ -0,0 +1 @@
+明日がある。

middleman-core/spec/middleman-core/binary_spec/unicode.txt

@@ -0,0 +1 @@
+明日がある。