Testing Vim modeline support

test/fixtures/Data/Modelines/not_perl.pl

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+/* vim: set filetype=prolog: */
+
+# I am Prolog

test/fixtures/Data/Modelines/ruby

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+/* vim: set filetype=ruby: */
+
+# I am Ruby

test/fixtures/Data/Modelines/seeplusplus

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+/* vim: set ft=cpp: */
+
+I would like to be C++ please.

test/test_modelines.rb

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+require_relative "./helper"
+
+class TestModelines < Minitest::Test
+  include Linguist
+
+  def fixtures_path
+    File.expand_path("../fixtures", __FILE__)
+  end
+
+  def fixture_blob(name)
+    name = File.join(fixtures_path, name) unless name =~ /^\//
+    FileBlob.new(name, fixtures_path)
+  end
+
+  def test_modelines
+    assert_equal Language["Ruby"], fixture_blob("Data/Modelines/ruby").language
+    assert_equal Language["C++"], fixture_blob("Data/Modelines/seeplusplus").language
+    assert_equal Language["Prolog"], fixture_blob("Data/Modelines/not_perl.pl").language
+  end
+end