diff --git a/test/helper.rb b/test/helper.rb
index 8bf4c7dc..faeb414f 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -1,11 +1,11 @@
 require 'rubygems'
 require 'rack/test'
-require 'test/unit'
 require 'shoulda'
-require 'mocha/setup'
-require 'fileutils'
+require 'minitest/autorun'
 require 'minitest/reporters'
 require 'minitest/spec'
+require 'mocha/setup'
+require 'fileutils'
 require 'tmpdir'
 
 # Silence locale validation warning
@@ -62,14 +62,29 @@ def normal(text)
   text
 end
 
-# test/spec/mini 3
-# http://gist.github.com/25455
-# chris@ozmm.org
-# file:lib/test/spec/mini.rb
+# The following configuration originates from this gist:
+
+#     http://gist.github.com/25455
+#
+# But it has been modified since it was first committed. It allows you to
+# write tests with an RSpec-like DSL:
+#
+#    context "my test context" do
+#      setup do
+#        # My test setup
+#      end
+#
+#      teardown do
+#        # My test teardown
+#      end
+#
+#      test "some functionality" do
+#        assert true
+#      end
+#    end
 def context(*args, &block)
   return super unless (name = args.first) && block
-  require 'test/unit'
-  klass = Class.new(defined?(ActiveSupport::TestCase) ? ActiveSupport::TestCase : Test::Unit::TestCase) do
+  klass = Class.new(Minitest::Test) do
     def self.test(name, &block)
       define_method("test_#{name.gsub(/\W/, '_')}", &block) if block
     end
@@ -85,10 +100,13 @@ def context(*args, &block)
       define_method(:teardown, &block)
     end
   end
+
   (
-  class << klass;
-    self
-  end).send(:define_method, :name) { name.gsub(/\W/, '_') }
+    class << klass;
+      self
+    end
+  ).send(:define_method, :name) { name.gsub(/\W/, '_') }
+
   $contexts << klass
   klass.class_eval &block
 end
diff --git a/test/test_allow_editing.rb b/test/test_allow_editing.rb
index 8ce2394d..104e0332 100644
--- a/test/test_allow_editing.rb
+++ b/test/test_allow_editing.rb
@@ -51,11 +51,11 @@ context "Precious::Views::Editing" do
 
     get '/gollum/history/A'
 
-    assert_no_match /Edit/, last_response.body, "'Edit' link is not blocked in history template"
+    refute_match /Edit/, last_response.body, "'Edit' link is not blocked in history template"
 
     get '/gollum/compare/A/fc66539528eb96f21b2bbdbf557788fe8a1196ac..b26b791cb7917c4f37dd9cb4d1e0efb24ac4d26f'
 
-    assert_no_match /Edit Page/,             last_response.body, "'Edit Page' link is not blocked in compare template"
+    refute_match /Edit Page/,             last_response.body, "'Edit Page' link is not blocked in compare template"
     assert_match /Revert Changes/,        last_response.body, "'Revert Changes' link is blocked in compare template"
   end
 
@@ -63,27 +63,27 @@ context "Precious::Views::Editing" do
     Precious::App.set(:wiki_options, { allow_editing: false })
     get '/A'
 
-    assert_no_match /Delete this Page/, last_response.body, "'Delete this Page' link not blocked in page template"
-    assert_no_match /New/,              last_response.body, "'New' button not blocked in page template"
-    assert_no_match /Upload\b/,         last_response.body, "'Upload' link not blocked in page template"
-    assert_no_match /Rename/,           last_response.body, "'Rename' link not blocked in page template"
-    assert_no_match /Edit/,             last_response.body, "'Edit' link not blocked in page template"
+    refute_match /Delete this Page/, last_response.body, "'Delete this Page' link not blocked in page template"
+    refute_match /New/,              last_response.body, "'New' button not blocked in page template"
+    refute_match /Upload\b/,         last_response.body, "'Upload' link not blocked in page template"
+    refute_match /Rename/,           last_response.body, "'Rename' link not blocked in page template"
+    refute_match /Edit/,             last_response.body, "'Edit' link not blocked in page template"
 
     get '/gollum/overview'
 
-    assert_no_match /New/, last_response.body, "'New' link not blocked in pages template"
+    refute_match /New/, last_response.body, "'New' link not blocked in pages template"
 
     get '/gollum/history/A'
 
-    assert_no_match /Edit/, last_response.body, "'Edit' link not blocked in history template"
+    refute_match /Edit/, last_response.body, "'Edit' link not blocked in history template"
 
     get '/gollum/compare/A/fc66539528eb96f21b2bbdbf557788fe8a1196ac..b26b791cb7917c4f37dd9cb4d1e0efb24ac4d26f'
 
-    assert_no_match /Edit Page/,             last_response.body, "'Edit Page' link not blocked in compare template"
-    assert_no_match /Revert Changes/,        last_response.body, "'Revert Changes' link not blocked in compare template"
+    refute_match /Edit Page/,             last_response.body, "'Edit Page' link not blocked in compare template"
+    refute_match /Revert Changes/,        last_response.body, "'Revert Changes' link not blocked in compare template"
   end
 
   def app
     Precious::App
   end
-end
\ No newline at end of file
+end
diff --git a/test/test_app.rb b/test/test_app.rb
index 5d78e006..bcb8729e 100644
--- a/test/test_app.rb
+++ b/test/test_app.rb
@@ -14,7 +14,7 @@ context "Frontend" do
   teardown do
     FileUtils.rm_rf(@path)
   end
-  
+
   test "utf-8 kcode" do
     assert_equal 'μ†ℱ'.scan(/./), ["μ", "†", "ℱ"]
   end
@@ -104,21 +104,21 @@ EOF
     page_2 = @wiki.page(page_1.name)
     assert_equal 'abc', page_2.raw_data
     assert_equal 'def', page_2.version.message
-    assert_not_equal page_1.version.sha, page_2.version.sha
+    refute_equal page_1.version.sha, page_2.version.sha
   end
-  
+
   test "edit page fails when page is outdated (edit collision)" do
     page = @wiki.page('A')
     old_sha = page.sha
     post "/gollum/edit/A", :content => 'abc', :page => 'A',
          :format => page.format, :message => 'def', :etag => old_sha
     assert last_response.ok?
-    
+
     @wiki.clear_cache
     page = @wiki.page('A')
     new_sha = page.sha
-    assert_not_equal old_sha, new_sha
-    
+    refute_equal old_sha, new_sha
+
     post "/gollum/edit/A", :content => 'def', :page => 'A',
          :format => page.format, :message => 'def', :etag => old_sha
     assert_equal last_response.status, 412
@@ -134,7 +134,7 @@ EOF
     page_2 = @wiki.page(page_1.name)
     assert_equal 'abc', page_2.raw_data
     assert_equal '[no message]', page_2.version.message
-    assert_not_equal page_1.version.sha, page_2.version.sha
+    refute_equal page_1.version.sha, page_2.version.sha
   end
 
   test "edit page with slash" do
@@ -165,12 +165,12 @@ EOF
     assert_equal 'header', header_2.raw_data
     assert_equal 'footer', foot_2.raw_data
     assert_equal 'def', foot_2.version.message
-    assert_not_equal foot_1.version.sha, foot_2.version.sha
-    assert_not_equal header_1.version.sha, header_2.version.sha
+    refute_equal foot_1.version.sha, foot_2.version.sha
+    refute_equal header_1.version.sha, header_2.version.sha
 
     assert_equal 'sidebar', side_2.raw_data
     assert_equal 'def', side_2.version.message
-    assert_not_equal side_1.version.sha, side_2.version.sha
+    refute_equal side_1.version.sha, side_2.version.sha
     assert_equal commits, @wiki.repo.commits('master').size
   end
 
@@ -187,7 +187,7 @@ EOF
     page_2 = @wiki.page('C')
     assert_equal "INITIAL\n\nSPAM2\n", page_2.raw_data
     assert_equal 'def', page_2.last_version.message
-    assert_not_equal page_1.version.sha, page_2.version.sha
+    refute_equal page_1.version.sha, page_2.version.sha
   end
 
   test "rename preserves format" do
@@ -222,7 +222,7 @@ EOF
 
   test "renames page in subdirectory" do
     page_1 = @wiki.page("G/H")
-    assert_not_equal page_1, nil
+    refute_equal page_1, nil
     post "/gollum/rename/G/H", :rename => "/I/C", :message => 'def'
 
     follow_redirect!
@@ -234,12 +234,12 @@ EOF
     page_2 = @wiki.page('I/C')
     assert_equal "INITIAL\n\nSPAM2\n", page_2.raw_data
     assert_equal 'def', page_2.last_version.message
-    assert_not_equal page_1.version.sha, page_2.version.sha
+    refute_equal page_1.version.sha, page_2.version.sha
   end
 
   test "renames page relative in subdirectory" do
     page_1 = @wiki.page("G/H")
-    assert_not_equal page_1, nil
+    refute_equal page_1, nil
     post "/gollum/rename/G/H", :rename => "K/C", :message => 'def'
 
     follow_redirect!
@@ -251,7 +251,7 @@ EOF
     page_2 = @wiki.page('G/K/C')
     assert_equal "INITIAL\n\nSPAM2\n", page_2.raw_data
     assert_equal 'def', page_2.last_version.message
-    assert_not_equal page_1.version.sha, page_2.version.sha
+    refute_equal page_1.version.sha, page_2.version.sha
   end
 
   test "creates page" do
@@ -320,7 +320,7 @@ EOF
     name = "#{dir}/bar"
     get "/gollum/create/#{name}"
     assert_match(/\/#{dir}/, last_response.body)
-    assert_no_match(/[^\/]#{dir}/, last_response.body)
+    refute_match(/[^\/]#{dir}/, last_response.body)
   end
 
   test "create with template succeed if template exists" do
@@ -351,7 +351,7 @@ EOF
     post '/gollum/edit/', :content => 'edit_msg',
          :page              => page, :path => path, :message => ''
     page_e = @wiki.page(::File.join(path,page))
-    assert_equal nil, page_e
+    assert_nil page_e
   end
 
   test "edit allows changing format" do
@@ -407,23 +407,23 @@ EOF
 
     @wiki.clear_cache
     page = @wiki.page(name)
-    assert_not_equal 'abc', page.raw_data
+    refute_equal 'abc', page.raw_data
   end
-  
+
   test "uploading is not allowed unless explicitly enabled" do
     temp_upload_file = Tempfile.new(['upload', '.file']) << 'abc'
     temp_upload_file.close
     post "/gollum/upload_file", :file => Rack::Test::UploadedFile.new(::File.open(temp_upload_file))
     assert_equal 405, last_response.status
   end
-  
+
   test "upload a file with mode dir" do
     temp_upload_file = Tempfile.new(['upload', '.file']) << 'abc'
     temp_upload_file.close
     Precious::App.set(:wiki_options, {allow_uploads: true})
-  
+
     post "/gollum/upload_file", :file => Rack::Test::UploadedFile.new(::File.open(temp_upload_file))
-  
+
     assert_equal 302, last_response.status # redirect is expected
     @wiki.clear_cache
     file = @wiki.file("uploads/#{::File.basename(temp_upload_file.path)}")
@@ -436,7 +436,7 @@ EOF
     temp_upload_file.close
     Precious::App.set(:wiki_options, {allow_uploads: true, per_page_uploads: true})
     post "/gollum/upload_file", {:file => Rack::Test::UploadedFile.new(::File.open(temp_upload_file))}, {'HTTP_REFERER' => 'http://localhost:4567/Home.md', 'HTTP_HOST' => 'localhost:4567'}
-    
+
     assert_equal 302, last_response.status # redirect is expected
     @wiki.clear_cache
     # Find the file in a page-specific subdir (here: Home), based on referer
@@ -444,13 +444,13 @@ EOF
     assert_equal 'abc', file.raw_data
     Precious::App.set(:wiki_options, {allow_uploads: false, per_page_uploads: false})
   end
-  
+
   test "upload a file with https referer" do
     temp_upload_file = Tempfile.new(['https_upload', '.file']) << 'abc'
     temp_upload_file.close
     Precious::App.set(:wiki_options, {allow_uploads: true, per_page_uploads: true})
     post "/gollum/upload_file", {:file => Rack::Test::UploadedFile.new(::File.open(temp_upload_file))}, {'HTTP_REFERER' => 'https://localhost:4567/Home.md', 'HTTP_HOST' => 'localhost:4567'}
-    
+
     assert_equal 302, last_response.status # redirect is expected
     @wiki.clear_cache
     # Find the file in a page-specific subdir (here: Home), based on referer
@@ -458,8 +458,8 @@ EOF
     assert_equal 'abc', file.raw_data
     Precious::App.set(:wiki_options, {allow_uploads: false, per_page_uploads: false})
   end
-  
-  
+
+
   test "guard against uploading an existing file" do
     temp_upload_file = Tempfile.new(['upload', '.file']) << 'abc'
     temp_upload_file.close
@@ -471,7 +471,7 @@ EOF
     assert_equal 409, last_response.status
     Precious::App.set(:wiki_options, {allow_uploads: false})
   end
-  
+
   test "delete a page" do
     name = "deleteme"
     post "/gollum/create", :content => 'abc', :page => name,
@@ -483,7 +483,7 @@ EOF
 
     @wiki.clear_cache
     page = @wiki.page(name)
-    assert_equal nil, page
+    assert_nil page
   end
 
   test "previews content" do
@@ -507,7 +507,7 @@ EOF
 
     @wiki.clear_cache
     page2 = @wiki.page('B')
-    assert_not_equal page1.version.sha, page2.version.sha
+    refute_equal page1.version.sha, page2.version.sha
     assert_equal "INITIAL", page2.raw_data.strip
     assert_equal "Revert commit 7c45b5f", page2.version.message
   end
@@ -521,7 +521,7 @@ EOF
 
     @wiki.clear_cache
     page2 = @wiki.page('A')
-    assert_not_equal page1.version.sha, page2.version.sha
+    refute_equal page1.version.sha, page2.version.sha
     assert_equal "INITIAL", page2.raw_data.strip
   end
 
@@ -535,7 +535,7 @@ EOF
     page2 = @wiki.page('A')
     assert_equal page1.version.sha, page2.version.sha
   end
-  
+
 =begin
   # redirects are now handled by class MapGollum in bin/gollum
   # they should be set in config.ru
@@ -583,7 +583,7 @@ EOF
                      { :name => 'user1', :email => 'user1' });
 
     get page
-    assert_no_match /custom.js/, last_response.body
+    refute_match /custom.js/, last_response.body
   end
 
   test "add custom.js if setting" do
@@ -601,7 +601,7 @@ EOF
 
   test "don't allow changing custom js or css" do
     Precious::App.set(:wiki_options, { :js => true, :css => true })
-  
+
     ['create', 'edit'].each do |route|
       ['.css', '.js'].each do |ext|
         get "/gollum/#{route}/custom#{ext}"
@@ -634,7 +634,7 @@ EOF
          :page    => 'Multibyte', :format => :markdown, :message => 'mesg'
 
     page = @wiki.page('Multibyte')
-    
+
     post "/gollum/edit/Multibyte",
          :content => 'りんご', :header => 'みかん', :footer => 'バナナ', :sidebar => 'スイカ',
          :page    => 'Multibyte', :format => :markdown, :message => 'mesg', :etag => page.sha
@@ -652,7 +652,7 @@ EOF
     get "A"
 
     assert last_response.ok?
-    assert_no_match /meta name="robots" content="noindex, nofollow"/, last_response.body
+    refute_match /meta name="robots" content="noindex, nofollow"/, last_response.body
 
     get "A/fc66539528eb96f21b2bbdbf557788fe8a1196ac"
 
@@ -831,10 +831,10 @@ context "Frontend with lotr" do
   test "show revision of specific file" do
     old_sha = "df26e61e707116f81ebc6b935ec6d1676b7e96c4"
     update_sha = "f803c64d11407b23797325e3843f3f378b78f611"
-    
+
     get "Data.csv/#{old_sha}"
     assert last_response.ok?
-    assert_no_match /Samwise,Gamgee/, last_response.body
+    refute_match /Samwise,Gamgee/, last_response.body
 
     get "Data.csv/#{update_sha}"
     assert last_response.ok?
@@ -879,7 +879,7 @@ context "Frontend with page-file-dir" do
     name = "#{dir}/baz"
     get "/gollum/create/#{name}"
     assert_match(/\/#{dir}/, last_response.body)
-    assert_no_match(/[^\/]#{dir}/, last_response.body)
+    refute_match(/[^\/]#{dir}/, last_response.body)
   end
 
   test "use custom.css from page-file-dir path if page-file-dir is set" do
@@ -920,7 +920,7 @@ end
 
 context "Frontend with empty repo" do
   include Rack::Test::Methods
-  
+
   setup do
     @path = cloned_testpath("examples/empty.git")
     @wiki = Gollum::Wiki.new(@path)
@@ -931,11 +931,11 @@ context "Frontend with empty repo" do
   teardown do
     FileUtils.rm_rf(@path)
   end
-  
+
   def app
     Precious::App
   end
-  
+
   test 'previews content on the first page of an empty wiki' do
     post '/gollum/preview', :content => 'abc', :format => 'markdown'
     assert last_response.ok?
@@ -947,12 +947,12 @@ context "Frontend with empty repo" do
     assert_equal '/gollum/create/Home', last_request.fullpath
     assert last_response.ok?
   end
-  
+
 end
 
 context 'Frontend with base path' do
   include Rack::Test::Methods
-  
+
   setup do
     @path = cloned_testpath("examples/lotr.git")
     @wiki = Gollum::Wiki.new(@path)
@@ -964,24 +964,24 @@ context 'Frontend with base path' do
   teardown do
     FileUtils.rm_rf(@path)
   end
-  
+
   test 'page with base path' do
     get '/wiki/Home'
     assert last_response.ok?
   end
-  
+
   test 'base path mathjax assets' do
     get '/wiki/Home'
     assert last_response.ok?
     assert last_response.body.include?('<script defer src="/wiki/gollum/assets/mathjax/MathJax.js?config=')
   end
-  
+
   test 'compare view' do
     get '/wiki/gollum/compare/Bilbo-Baggins.md?versions[]=f25eccd98e9b667f9e22946f3e2f945378b8a72d&versions[]=5bc1aaec6149e854078f1d0f8b71933bbc6c2e43'
     follow_redirect!
     assert last_response.ok?
     assert_equal '/wiki/gollum/compare/Bilbo-Baggins.md/5bc1aaec6149e854078f1d0f8b71933bbc6c2e43...f25eccd98e9b667f9e22946f3e2f945378b8a72d', last_request.fullpath
-    
+
     get '/wiki/gollum/compare/Bilbo-Baggins.md?versions[]=f25eccd98e9b667f9e22946f3e2f945378b8a72d'
     follow_redirect!
     assert last_response.ok?
@@ -992,7 +992,7 @@ context 'Frontend with base path' do
     assert last_response.ok?
     assert_equal '/wiki/gollum/history/Bilbo-Baggins.md', last_request.fullpath
   end
-  
+
   def app
     Precious::MapGollum.new(@base_path)
   end
diff --git a/test/test_page_view.rb b/test/test_page_view.rb
index 9fe27284..7580645b 100644
--- a/test/test_page_view.rb
+++ b/test/test_page_view.rb
@@ -35,7 +35,7 @@ context "Precious::Views::Page" do
     @view.instance_variable_set :@content, page.formatted_data
     @view.instance_variable_set :@h1_title, false
 
-    assert_include @view.breadcrumb, "数学 📘"
+    assert_includes @view.breadcrumb, "数学 📘"
   end
 
   test 'page <title> is the page header from content, if present' do
diff --git a/test/test_template_cascade.rb b/test/test_template_cascade.rb
index 14862996..571d5bff 100644
--- a/test/test_template_cascade.rb
+++ b/test/test_template_cascade.rb
@@ -37,7 +37,11 @@ class TestTemplateCascade < Minitest::Unit::TestCase
     get '/Home'
     assert_equal '/Home', last_request.fullpath
     assert last_response.ok?
-    assert_no_match /PAGE_OVERRIDE/, last_response.body
-    assert_no_match /NAVBAR_OVERRIDE/, last_response.body
+    refute_match /PAGE_OVERRIDE/, last_response.body
+    refute_match /NAVBAR_OVERRIDE/, last_response.body
+  end
+
+  def teardown
+    FileUtils.rm_rf(@path)
   end
 end