Start on basic heuristics tests

test/test_heuristics.rb

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+require 'linguist/heuristics'
+require 'linguist/language'
+require 'linguist/samples'
+
+require 'test/unit'
+
+class TestHeuristcs < Test::Unit::TestCase
+  include Linguist
+
+  def samples_path
+    File.expand_path("../../samples", __FILE__)
+  end
+
+  def fixture(name)
+    File.read(File.join(samples_path, name))
+  end
+
+  def test_find_by_heuristics
+    languages = ["C++", "Objective-C"]
+    results = Heuristics.find_by_heuristics(fixture("Objective-C/StyleViewController.h"), languages)
+    assert_equal Language["Objective-C"], results.first
+  end
+end