Don't rely on subsecond precision being applied in tests

When I originally reviewed the #20317, I believe these changes were
present, but it appears that it was later updated so that they were
removed. Since Travis hadn't re-run the build, this slipped through.

2 files changed, 6 insertions, 2 deletions

diff --git a/activerecord/test/cases/associations/belongs_to_associations_test.rb b/activerecord/test/cases/associations/belongs_to_associations_test.rb
index 02b67f901f..938350627f 100644
--- a/activerecord/test/cases/associations/belongs_to_associations_test.rb
+++ b/activerecord/test/cases/associations/belongs_to_associations_test.rb
@@ -500,7 +500,9 @@ class BelongsToAssociationsTest < ActiveRecord::TestCase
     line_item = LineItem.create!
     invoice = Invoice.create!(line_items: [line_item])
     initial = invoice.updated_at
-    line_item.touch
+    travel(1.second) do
+      line_item.touch
+    end
 
     assert_not_equal initial, invoice.reload.updated_at
   end
diff --git a/activerecord/test/cases/associations/has_many_associations_test.rb b/activerecord/test/cases/associations/has_many_associations_test.rb
index 0beaf0056a..cd19a7a5bc 100644
--- a/activerecord/test/cases/associations/has_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_associations_test.rb
@@ -170,7 +170,9 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
     part = ShipPart.create(name: 'cockpit')
     updated_at = part.updated_at
 
-    ship.parts << part
+    travel(1.second) do
+      ship.parts << part
+    end
 
     assert_equal part.ship, ship
     assert_not_equal part.updated_at, updated_at