use `assert_not` instead of `refute` as mentioned in our guides.

As described in the "Follow Coding Conventions" section in our
contribution guide (http://edgeguides.rubyonrails.org/contributing_to_ruby_on_rails.html#follow-the-coding-conventions)
we favor `assert_not` over `refute`.

While we don't usually make stylistic changes on it's own I opted to do
it in this case. The reason being that test cases are usually copied as
a starting point for new tests. This results in a spread of `refute` in
files that have been using it already.

2 files changed, 2 insertions, 2 deletions

diff --git a/activerecord/test/cases/adapters/mysql/quoting_test.rb b/activerecord/test/cases/adapters/mysql/quoting_test.rb
index 426b088e2f..2024aa36ab 100644
--- a/activerecord/test/cases/adapters/mysql/quoting_test.rb
+++ b/activerecord/test/cases/adapters/mysql/quoting_test.rb
@@ -24,6 +24,6 @@ class MysqlQuotingTest < ActiveRecord::MysqlTestCase
     @conn.stubs(:full_version).returns('5.6.3')
     @conn.remove_instance_variable(:@version) if @conn.instance_variable_defined?(:@version)
     t = Time.now.change(usec: 1)
-    refute_match(/\.000001\z/, @conn.quoted_date(t))
+    assert_no_match(/\.000001\z/, @conn.quoted_date(t))
   end
 end
diff --git a/activerecord/test/cases/adapters/mysql2/quoting_test.rb b/activerecord/test/cases/adapters/mysql2/quoting_test.rb
index 92221e61bf..2de7e1b526 100644
--- a/activerecord/test/cases/adapters/mysql2/quoting_test.rb
+++ b/activerecord/test/cases/adapters/mysql2/quoting_test.rb
@@ -16,6 +16,6 @@ class Mysql2QuotingTest < ActiveRecord::Mysql2TestCase
     @connection.stubs(:full_version).returns('5.6.3')
     @connection.remove_instance_variable(:@version) if @connection.instance_variable_defined?(:@version)
     t = Time.now.change(usec: 1)
-    refute_match(/\.000001\z/, @connection.quoted_date(t))
+    assert_no_match(/\.000001\z/, @connection.quoted_date(t))
   end
 end