Skip pygments tests if pygmentize isn't available

lib/linguist/lexer.rb

@@ -8,6 +8,16 @@ module Linguist
     @name_index  = {}
     @alias_index = {}
 
+    # Internal: Test if system has Pygments
+    #
+    # Only used in tests to disable tests that require Pygments.
+    #
+    # Returns true if `pygmentize` in is PATH otherwise false.
+    def self.has_pygments?
+      `which #{Albino.bin}`
+      $?.success?
+    end
+
     # Public: Get all Lexers
     #
     # Returns an Array of Lexers

test/test_blob.rb

@@ -289,6 +289,7 @@ class TestBlob < Test::Unit::TestCase
     assert_equal nil, blob("foo.rb").shebang_language
   end
 
+  if Lexer.has_pygments?
     def test_colorize
       assert_equal <<-HTML, blob("foo.rb").colorize
 <div class="highlight"><pre><span class="k">module</span> <span class="nn">Foo</span>
@@ -304,4 +305,5 @@ class TestBlob < Test::Unit::TestCase
 <span class="k">end</span>
       HTML
     end
+  end
 end

test/test_language.rb

@@ -337,6 +337,7 @@ class TestLanguage < Test::Unit::TestCase
     assert !Language['SQL'].searchable?
   end
 
+  if Lexer.has_pygments?
     def test_colorize
       assert_equal <<-HTML, Language['Text'].colorize("Hello")
 <div class="highlight"><pre>Hello
@@ -364,4 +365,5 @@ Hello
 <span class="k">end</span>
       HTML
     end
+  end
 end

test/test_lexer.rb

@@ -50,6 +50,7 @@ class TestLexer < Test::Unit::TestCase
     assert !Lexer['Ruby'].eql?(Lexer.new('Ruby'))
   end
 
+  if Lexer.has_pygments?
     def test_colorize
       assert_equal <<-HTML, Lexer['Text only'].colorize("Hello")
 <div class="highlight"><pre>Hello
@@ -77,4 +78,5 @@ Hello
 <span class="k">end</span>
       HTML
     end
+  end
 end