Revert "use Minitest::Test"

This reverts commit 1168215.

#121 (comment)

Author: Jerry Cheung

Gemfile

@@ -1,6 +1,2 @@
 source 'https://rubygems.org'
 gemspec
-
-group :test do
-  gem "minitest", "~> 5.0"
-end

test/ber/core_ext/test_array.rb

@@ -1,6 +1,6 @@
 require_relative '../../test_helper'
 
-class TestBERArrayExtension < Minitest::Test
+class TestBERArrayExtension < Test::Unit::TestCase
   def test_control_code_array
     control_codes = []
     control_codes << ['1.2.3'.to_ber, true.to_ber].to_ber_sequence

test/ber/core_ext/test_string.rb

@@ -1,6 +1,6 @@
 require_relative '../../test_helper'
 
-class TestBERStringExtension < Minitest::Test
+class TestBERStringExtension < Test::Unit::TestCase
   def setup
     @bind_request = "0$\002\001\001`\037\002\001\003\004\rAdministrator\200\vad_is_bogus UNCONSUMED".b
     @result = @bind_request.read_ber!(Net::LDAP::AsnSyntax)

test/ber/test_ber.rb

@@ -1,6 +1,6 @@
 require_relative '../test_helper'
 
-class TestBEREncoding < Minitest::Test
+class TestBEREncoding < Test::Unit::TestCase
   def test_empty_array
     assert_equal [], [].to_ber.read_ber
   end
@@ -84,7 +84,7 @@ def test_non_utf8_encodable_strings
   end
 end
 
-class TestBERDecoding < Minitest::Test
+class TestBERDecoding < Test::Unit::TestCase
   def test_decode_number
     assert_equal 6, "\002\001\006".read_ber(Net::LDAP::AsnSyntax)
   end
@@ -98,7 +98,7 @@ def test_decode_ldap_bind_request
   end
 end
 
-class TestBERIdentifiedString < Minitest::Test
+class TestBERIdentifiedString < Test::Unit::TestCase
   def test_binary_data
     data = ["6a31b4a12aa27a41aca9603f27dd5116"].pack("H*").force_encoding("ASCII-8BIT")
     bis = Net::BER::BerIdentifiedString.new(data)

test/test_dn.rb

@@ -1,7 +1,7 @@
 require_relative '../test_helper'
 require 'net/ldap/dn'
 
-class TestDN < Minitest::Test
+class TestDN < Test::Unit::TestCase
   def test_escape
     assert_equal '\\,\\+\\"\\\\\\<\\>\\;', Net::LDAP::DN.escape(',+"\\<>;')
   end

test/test_entry.rb

@@ -1,6 +1,6 @@
 require_relative '../test_helper'
 
-class TestEntry < Minitest::Test
+class TestEntry < Test::Unit::TestCase
   def setup
     @entry = Net::LDAP::Entry.new 'cn=Barbara,o=corp'
   end
@@ -41,7 +41,7 @@ def test_case_insensitive_attribute_names
   end
 end
 
-class TestEntryLDIF < Minitest::Test
+class TestEntryLDIF < Test::Unit::TestCase
   def setup
     @entry = Net::LDAP::Entry.from_single_ldif_string(
       %Q{dn: something

test/test_filter.rb

@@ -1,6 +1,6 @@
 require_relative '../test_helper'
 
-class TestFilter < Minitest::Test
+class TestFilter < Test::Unit::TestCase
   Filter = Net::LDAP::Filter
 
   def test_bug_7534_rfc2254
@@ -123,7 +123,7 @@ def test_ber_from_rfc2254_filter
 
 # tests ported over from rspec. Not sure if these overlap with the above
 # https://github.com/ruby-ldap/ruby-net-ldap/pull/121
-class TestFilterRSpec < Minitest::Test
+class TestFilterRSpec < Test::Unit::TestCase
   def test_ex_convert
     assert_equal '(foo:=bar)', Net::LDAP::Filter.ex('foo', 'bar').to_s
   end

test/test_filter_parser.rb

@@ -1,7 +1,7 @@
 # encoding: utf-8
 require_relative '../test_helper'
 
-class TestFilterParser < Minitest::Test
+class TestFilterParser < Test::Unit::TestCase
   def test_ascii
     assert_kind_of Net::LDAP::Filter, Net::LDAP::Filter::FilterParser.parse("(cn=name)")
   end

test/test_ldap_connection.rb

@@ -1,6 +1,6 @@
 require_relative '../test_helper'
 
-class TestLDAPConnection < Minitest::Test
+class TestLDAPConnection < Test::Unit::TestCase
   def test_unresponsive_host
     assert_raise Net::LDAP::LdapError do
       Net::LDAP::Connection.new(:host => 'test.mocked.com', :port => 636)
@@ -45,7 +45,7 @@ def test_modify_ops_replace
 end
 
 
-class TestLDAPConnectionErrors < Minitest::Test
+class TestLDAPConnectionErrors < Test::Unit::TestCase
   def setup
     @tcp_socket = flexmock(:connection)
     @tcp_socket.should_receive(:write)
@@ -74,7 +74,7 @@ def test_no_error_on_success
   end
 end
 
-class TestLDAPConnectionInstrumentation < Minitest::Test
+class TestLDAPConnectionInstrumentation < Test::Unit::TestCase
   def setup
     @tcp_socket = flexmock(:connection)
     @tcp_socket.should_receive(:write)

test/test_ldif.rb

@@ -5,7 +5,7 @@
 require 'digest/sha1'
 require 'base64'
 
-class TestLdif < Minitest::Test
+class TestLdif < Test::Unit::TestCase
   TestLdifFilename = "#{File.dirname(__FILE__)}/testdata.ldif"
 
   def test_empty_ldif