diff --git a/test/helper.rb b/test/helper.rb
index a6e38cb18..17447ab2e 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 $:.unshift File.expand_path("../../lib", __FILE__)
 
-require 'coveralls'
+require "coveralls"
 Coveralls.wear!
 
 gem "minitest", "~> 5"
diff --git a/test/test_rake_file_utils.rb b/test/test_rake_file_utils.rb
index bfdaf75bd..90526b1d9 100644
--- a/test/test_rake_file_utils.rb
+++ b/test/test_rake_file_utils.rb
@@ -186,7 +186,7 @@ def test_sh_with_hash_option
     check_expansion
 
     verbose(false) {
-      sh "#{RUBY} check_expansion.rb", {chdir: "."}, { verbose: false }
+      sh "#{RUBY} check_expansion.rb", { chdir: "." }, verbose: false
     }
   end
 
diff --git a/test/test_rake_rake_test_loader.rb b/test/test_rake_rake_test_loader.rb
index fa35c44aa..fabee4721 100644
--- a/test/test_rake_rake_test_loader.rb
+++ b/test/test_rake_rake_test_loader.rb
@@ -6,7 +6,7 @@ class TestRakeRakeTestLoader < Rake::TestCase
   def setup
     super
 
-    @loader = File.join @rake_lib, 'rake/rake_test_loader.rb'
+    @loader = File.join @rake_lib, "rake/rake_test_loader.rb"
   end
 
   def test_pattern
@@ -35,7 +35,7 @@ def test_load_error
 
     assert_empty out
 
-    no_such_path = File.join @tempdir, 'no_such_test_file'
+    no_such_path = File.join @tempdir, "no_such_test_file"
 
     expected =
       /\A\n
diff --git a/test/test_rake_rules.rb b/test/test_rake_rules.rb
index 739e35470..52934c258 100644
--- a/test/test_rake_rules.rb
+++ b/test/test_rake_rules.rb
@@ -11,7 +11,7 @@ class TestRakeRules < Rake::TestCase
   OBJFILE    = "abc.o"
   FOOFILE    = "foo"
   DOTFOOFILE = ".foo"
-  MINFILE    = 'abc.min.o'
+  MINFILE    = "abc.min.o"
 
   def setup
     super
@@ -400,7 +400,7 @@ def obj.find_prereq(task_name)
 
   def test_works_with_chained_extensions_in_rules
     create_file(OBJFILE)
-    rule('.min.o' => ['.o']) do |t|
+    rule(".min.o" => [".o"]) do |t|
       @runs << t.name
       assert_equal OBJFILE, t.source
       assert_equal MINFILE, t.name