Bumping to v4.8.18 (#3370)

* make tests great again ✨

* version bump

* removing empty line in gemspec

github-linguist.gemspec

@@ -27,5 +27,4 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'color-proximity', '~> 0.2.1'
   s.add_development_dependency 'licensed'
   s.add_development_dependency 'licensee', '>= 8.6.0'
-
 end

lib/linguist/version.rb

@@ -1,3 +1,3 @@
 module Linguist
-  VERSION = "4.8.17"
+  VERSION = "4.8.18"
 end

test/test_language.rb

@@ -297,9 +297,9 @@ class TestLanguage < Minitest::Test
   end
 
   def test_doesnt_blow_up_with_blank_lookup
-    assert_equal nil, Language.find_by_alias('')
-    assert_equal nil, Language.find_by_name(nil)
-    assert_equal nil, Language[""]
+    assert_nil Language.find_by_alias('')
+    assert_nil Language.find_by_name(nil)
+    assert_nil Language[""]
   end
 
   def test_name

test/test_modelines.rb

@@ -4,7 +4,11 @@ class TestModelines < Minitest::Test
   include Linguist
 
   def assert_modeline(language, blob)
-    assert_equal language, Linguist::Strategy::Modeline.call(blob).first
+    if language.nil?
+      assert_nil Linguist::Strategy::Modeline.call(blob).first
+    else
+      assert_equal language, Linguist::Strategy::Modeline.call(blob).first
+    end
   end
 
   def test_modeline_strategy

test/test_shebang.rb

@@ -4,7 +4,11 @@ class TestShebang < Minitest::Test
   include Linguist
 
   def assert_interpreter(interpreter, body)
-    assert_equal interpreter, Shebang.interpreter(body)
+    if interpreter.nil?
+      assert_nil Shebang.interpreter(body)
+    else
+      assert_equal interpreter, Shebang.interpreter(body)
+    end
   end
 
   def test_shebangs