diff --git a/activerecord/test/cases/adapters/mysql2/optimizer_hints_test.rb b/activerecord/test/cases/adapters/mysql2/optimizer_hints_test.rb
index d043b3c726..aeb0466588 100644
--- a/activerecord/test/cases/adapters/mysql2/optimizer_hints_test.rb
+++ b/activerecord/test/cases/adapters/mysql2/optimizer_hints_test.rb
@@ -4,7 +4,7 @@ require "cases/helper"
 require "models/post"
 
 if supports_optimizer_hints?
-  class Mysql2OptimzerHintsTest < ActiveRecord::Mysql2TestCase
+  class Mysql2OptimizerHintsTest < ActiveRecord::Mysql2TestCase
     fixtures :posts
 
     def test_optimizer_hints
diff --git a/activerecord/test/cases/adapters/postgresql/optimizer_hints_test.rb b/activerecord/test/cases/adapters/postgresql/optimizer_hints_test.rb
index 1e27cf87e8..dfa5db7f04 100644
--- a/activerecord/test/cases/adapters/postgresql/optimizer_hints_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/optimizer_hints_test.rb
@@ -4,7 +4,7 @@ require "cases/helper"
 require "models/post"
 
 if supports_optimizer_hints?
-  class PostgresqlOptimzerHintsTest < ActiveRecord::PostgreSQLTestCase
+  class PostgresqlOptimizerHintsTest < ActiveRecord::PostgreSQLTestCase
     fixtures :posts
 
     def setup
diff --git a/activerecord/test/cases/adapters/postgresql/range_test.rb b/activerecord/test/cases/adapters/postgresql/range_test.rb
index 84672b2305..11c77e1253 100644
--- a/activerecord/test/cases/adapters/postgresql/range_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/range_test.rb
@@ -258,7 +258,7 @@ class PostgresqlRangeTest < ActiveRecord::PostgreSQLTestCase
                           Time.parse("2010-01-01 14:30:00.245124 +0100")...Time.parse("2010-01-01 13:30:00.245124 +0000"))
   end
 
-  def test_create_tsrange_preseve_usec
+  def test_create_tsrange_preserve_usec
     tz = ::ActiveRecord::Base.default_timezone
     assert_equal_round_trip(@new_range, :ts_range,
                             Time.public_send(tz, 2010, 1, 1, 14, 30, 0, 125435)...Time.public_send(tz, 2011, 2, 2, 14, 30, 0, 225435))
diff --git a/activerecord/test/cases/log_subscriber_test.rb b/activerecord/test/cases/log_subscriber_test.rb
index 3afb3652fd..d5191f3542 100644
--- a/activerecord/test/cases/log_subscriber_test.rb
+++ b/activerecord/test/cases/log_subscriber_test.rb
@@ -183,7 +183,7 @@ class LogSubscriberTest < ActiveRecord::TestCase
     assert_match(/SELECT .*?FROM .?developers.?/i, @logger.logged(:debug).last)
   end
 
-  def test_vebose_query_logs
+  def test_verbose_query_logs
     ActiveRecord::Base.verbose_query_logs = true
 
     logger = TestDebugLogSubscriber.new