8 files changed, 16 insertions, 16 deletions
diff --git a/activesupport/test/core_ext/date_time_ext_test.rb b/activesupport/test/core_ext/date_time_ext_test.rb
index 81777889ec..e9be181749 100644
--- a/activesupport/test/core_ext/date_time_ext_test.rb
+++ b/activesupport/test/core_ext/date_time_ext_test.rb
@@ -376,7 +376,7 @@ class DateTimeExtCalculationsTest < ActiveSupport::TestCase
     assert_equal   1, DateTime.civil(2000) <=> Time.utc(1999, 12, 31, 23, 59, 59).to_s
     assert_equal   0, DateTime.civil(2000) <=> Time.utc(2000, 1, 1, 0, 0, 0).to_s
     assert_equal(-1, DateTime.civil(2000) <=> Time.utc(2000, 1, 1, 0, 0, 1).to_s)
-    assert_equal nil, DateTime.civil(2000) <=> "Invalid as Time"
+    assert_nil DateTime.civil(2000) <=> "Invalid as Time"
   end
 
   def test_compare_with_integer
diff --git a/activesupport/test/core_ext/enumerable_test.rb b/activesupport/test/core_ext/enumerable_test.rb
index 5b839f1032..4f1ab993b8 100644
--- a/activesupport/test/core_ext/enumerable_test.rb
+++ b/activesupport/test/core_ext/enumerable_test.rb
@@ -172,7 +172,7 @@ class EnumerableTests < ActiveSupport::TestCase
                  payments.index_by(&:price))
     assert_equal Enumerator, payments.index_by.class
     if Enumerator.method_defined? :size
-      assert_equal nil, payments.index_by.size
+      assert_nil payments.index_by.size
       assert_equal 42, (1..42).index_by.size
     end
     assert_equal({ 5 => Payment.new(5), 15 => Payment.new(15), 10 => Payment.new(10) },
diff --git a/activesupport/test/core_ext/hash_ext_test.rb b/activesupport/test/core_ext/hash_ext_test.rb
index 8b816b3aad..ff12632f84 100644
--- a/activesupport/test/core_ext/hash_ext_test.rb
+++ b/activesupport/test/core_ext/hash_ext_test.rb
@@ -390,8 +390,8 @@ class HashExtTest < ActiveSupport::TestCase
     assert_equal 1, hash[:a]
     assert_equal true, hash[:b]
     assert_equal false, hash[:c]
-    assert_equal nil, hash[:d]
-    assert_equal nil, hash[:e]
+    assert_nil hash[:d]
+    assert_nil hash[:e]
   end
 
   def test_indifferent_reading_with_nonnil_default
@@ -404,7 +404,7 @@ class HashExtTest < ActiveSupport::TestCase
     assert_equal 1, hash[:a]
     assert_equal true, hash[:b]
     assert_equal false, hash[:c]
-    assert_equal nil, hash[:d]
+    assert_nil hash[:d]
     assert_equal 1, hash[:e]
   end
 
@@ -933,8 +933,8 @@ class HashExtTest < ActiveSupport::TestCase
     extracted = original.extract!(:a, :x)
 
     assert_equal expected, extracted
-    assert_equal nil, extracted[:a]
-    assert_equal nil, extracted[:x]
+    assert_nil extracted[:a]
+    assert_nil extracted[:x]
   end
 
   def test_indifferent_extract
@@ -1595,7 +1595,7 @@ class HashToXmlTest < ActiveSupport::TestCase
 
   def test_should_return_nil_if_no_key_is_supplied
     hash_wia = HashWithIndifferentAccess.new { 1 + 2 }
-    assert_equal nil, hash_wia.default
+    assert_nil hash_wia.default
   end
 
   def test_should_use_default_value_for_unknown_key
diff --git a/activesupport/test/core_ext/object/blank_test.rb b/activesupport/test/core_ext/object/blank_test.rb
index ab0676524e..1bedc76320 100644
--- a/activesupport/test/core_ext/object/blank_test.rb
+++ b/activesupport/test/core_ext/object/blank_test.rb
@@ -28,7 +28,7 @@ class BlankTest < ActiveSupport::TestCase
   end
 
   def test_presence
-    BLANK.each { |v| assert_equal nil, v.presence, "#{v.inspect}.presence should return nil" }
+    BLANK.each { |v| assert_nil v.presence, "#{v.inspect}.presence should return nil" }
     NOT.each   { |v| assert_equal v,   v.presence, "#{v.inspect}.presence should return self" }
   end
 end
diff --git a/activesupport/test/core_ext/object/deep_dup_test.rb b/activesupport/test/core_ext/object/deep_dup_test.rb
index e335ec1b40..f247ee16de 100644
--- a/activesupport/test/core_ext/object/deep_dup_test.rb
+++ b/activesupport/test/core_ext/object/deep_dup_test.rb
@@ -6,7 +6,7 @@ class DeepDupTest < ActiveSupport::TestCase
     array = [1, [2, 3]]
     dup = array.deep_dup
     dup[1][2] = 4
-    assert_equal nil, array[1][2]
+    assert_nil array[1][2]
     assert_equal 4, dup[1][2]
   end
 
@@ -14,7 +14,7 @@ class DeepDupTest < ActiveSupport::TestCase
     hash = { a: { b: "b" } }
     dup = hash.deep_dup
     dup[:a][:c] = "c"
-    assert_equal nil, hash[:a][:c]
+    assert_nil hash[:a][:c]
     assert_equal "c", dup[:a][:c]
   end
 
@@ -22,7 +22,7 @@ class DeepDupTest < ActiveSupport::TestCase
     array = [1, { a: 2, b: 3 } ]
     dup = array.deep_dup
     dup[1][:c] = 4
-    assert_equal nil, array[1][:c]
+    assert_nil array[1][:c]
     assert_equal 4, dup[1][:c]
   end
 
@@ -30,7 +30,7 @@ class DeepDupTest < ActiveSupport::TestCase
     hash = { a: [1, 2] }
     dup = hash.deep_dup
     dup[:a][2] = "c"
-    assert_equal nil, hash[:a][2]
+    assert_nil hash[:a][2]
     assert_equal "c", dup[:a][2]
   end
 
diff --git a/activesupport/test/core_ext/string_ext_test.rb b/activesupport/test/core_ext/string_ext_test.rb
index 98bcdda45b..7ae83cb964 100644
--- a/activesupport/test/core_ext/string_ext_test.rb
+++ b/activesupport/test/core_ext/string_ext_test.rb
@@ -339,7 +339,7 @@ class StringAccessTest < ActiveSupport::TestCase
 
   test "#at with Regex, returns the matching portion of the string" do
     assert_equal "lo", "hello".at(/lo/)
-    assert_equal nil, "hello".at(/nonexisting/)
+    assert_nil "hello".at(/nonexisting/)
   end
 
   test "#from with positive Integer, returns substring from the given position to the end" do
diff --git a/activesupport/test/core_ext/time_ext_test.rb b/activesupport/test/core_ext/time_ext_test.rb
index c11804c3dc..a399e36dc9 100644
--- a/activesupport/test/core_ext/time_ext_test.rb
+++ b/activesupport/test/core_ext/time_ext_test.rb
@@ -771,7 +771,7 @@ class TimeExtCalculationsTest < ActiveSupport::TestCase
     assert_equal   1, Time.utc(2000) <=> Time.utc(1999, 12, 31, 23, 59, 59, 999).to_s
     assert_equal   0, Time.utc(2000) <=> Time.utc(2000, 1, 1, 0, 0, 0).to_s
     assert_equal(-1, Time.utc(2000) <=> Time.utc(2000, 1, 1, 0, 0, 1, 0).to_s)
-    assert_equal nil, Time.utc(2000) <=> "Invalid as Time"
+    assert_nil Time.utc(2000) <=> "Invalid as Time"
   end
 
   def test_at_with_datetime
diff --git a/activesupport/test/core_ext/time_with_zone_test.rb b/activesupport/test/core_ext/time_with_zone_test.rb
index 620084f27d..629666947f 100644
--- a/activesupport/test/core_ext/time_with_zone_test.rb
+++ b/activesupport/test/core_ext/time_with_zone_test.rb
@@ -1057,7 +1057,7 @@ class TimeWithZoneMethodsForTimeAndDateTimeTest < ActiveSupport::TestCase
     Time.zone = -9.hours
     assert_equal ActiveSupport::TimeZone["Alaska"], Time.zone
     Time.zone = nil
-    assert_equal nil, Time.zone
+    assert_nil Time.zone
   end
 
   def test_time_zone_getter_and_setter_with_zone_default_set