Language detection test for non-sample files

test/test_blob.rb

@@ -407,6 +407,25 @@ class TestBlob < Test::Unit::TestCase
       assert blob.language, "No language for #{sample[:path]}"
       assert_equal sample[:language], blob.language.name, blob.name
     end
+
+    # Test language detection for files which shouldn't be used as samples
+    root = File.expand_path('../../test-files', __FILE__)
+    Dir.entries(root).each do |language|
+        next if language == '.' || language == '..'
+
+        # Each directory contains test files of a language
+        dirname = File.join(root, language)
+        Dir.entries(dirname).each do |filename|
+            next if filename == '.' || filename == '..'
+
+            # By default blob search the file in the samples;
+            # thus, we need to give it the absolute path
+            filepath = File.join(dirname, filename)
+            blob = blob(filepath)
+            assert blob.language, "No language for #{filepath}"
+            assert_equal language, blob.language.name, blob.name
+        end
+    end
   end
 
   def test_lexer