Refactor test assertions and update Mocha setup

* Update test assertions to modern Mocha methods
* Change require 'mocha/setup' to require 'mocha/test_unit' in test_helper.rb

Author: martencassel

test/ad_provider_test.rb

@@ -74,7 +74,7 @@ def test_rebuild_host_returns_password
   end
 
   def test_generate_password_returns_random_passwords
-    assert_not_equal @provider.generate_password, @provider.generate_password
+    refute_equal @provider.generate_password, @provider.generate_password
   end
 
   def test_generate_password_returns_20_char_long_password
@@ -83,22 +83,22 @@ def test_generate_password_returns_20_char_long_password
 
   def test_apply_computername_prefix_should_return_false_when_prefix_is_nil
     provider = Proxy::AdRealm::Provider.new(computername_prefix: nil, realm: 'example.com')
-    assert_false provider.apply_computername_prefix?('host.example.com')
+    refute provider.apply_computername_prefix?('host.example.com')
   end
 
   def test_apply_computername_prefix_should_return_false_when_prefix_is_empty
     provider = Proxy::AdRealm::Provider.new(computername_prefix: '', realm: 'example.com')
-    assert_false provider.apply_computername_prefix?('host.example.com')
+    refute provider.apply_computername_prefix?('host.example.com')
   end
 
   def test_apply_computername_prefix_should_return_false_when_hostname_contains_prefix
     provider = Proxy::AdRealm::Provider.new(computername_prefix: 'PREFIX-', realm: 'example.com')
-    assert_false provider.apply_computername_prefix?('prefix-host.example.com')
+    refute provider.apply_computername_prefix?('prefix-host.example.com')
   end
 
   def test_apply_computername_prefix_should_return_true_when_computername_hash_is_used
     provider = Proxy::AdRealm::Provider.new(computername_prefix: 'PREFIX-', computername_hash: true, realm: 'example.com')
-    assert_true provider.apply_computername_prefix?('host.example.com')
+    assert provider.apply_computername_prefix?('host.example.com')
   end
 
   def test_hostfqdn_to_computername_uses_prefix
@@ -121,7 +121,7 @@ def test_unrecognized_realm_raises_exception
   end
 
   def test_find
-    assert_true @provider.find('a_host_fqdn')
+    assert @provider.find('a_host_fqdn')
   end
 
   def test_delete

test/test_helper.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require 'test/unit'
-require 'mocha/setup'
+require 'mocha/test_unit'
 
 require 'smart_proxy_for_testing'