1 files changed, 24 insertions, 5 deletions
diff --git a/guides/source/testing.md b/guides/source/testing.md
index 93372b5c26..9540bb2af5 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -781,7 +781,7 @@ This can be helpful for viewing the browser at the point a test failed, or
 to view screenshots later for debugging.
 
 Two methods are provided: `take_screenshot` and `take_failed_screenshot`.
-`take_failed_screenshot` is automatically included in `after_teardown` inside
+`take_failed_screenshot` is automatically included in `before_teardown` inside
 Rails.
 
 The `take_screenshot` helper method can be included anywhere in your tests to
@@ -1212,7 +1212,7 @@ Let's start by adding this assertion to our `test_should_create_article` test:
 ```ruby
 test "should create article" do
   assert_difference('Article.count') do
-    post article_url, params: { article: { title: 'Some title' } }
+    post articles_url, params: { article: { title: 'Some title' } }
   end
 
   assert_redirected_to article_path(Article.last)
@@ -1404,7 +1404,7 @@ If you find your helpers are cluttering `test_helper.rb`, you can extract them i
 ```ruby
 # lib/test/multiple_assertions.rb
 module MultipleAssertions
-  def assert_multiple_of_fourty_two(number)
+  def assert_multiple_of_forty_two(number)
     assert (number % 42 == 0), 'expected #{number} to be a multiple of 42'
   end
 end
@@ -1419,8 +1419,8 @@ require 'test/multiple_assertions'
 class NumberTest < ActiveSupport::TestCase
   include MultipleAssertions
 
-  test '420 is a multiple of fourty two' do
-    assert_multiple_of_fourty_two 420
+  test '420 is a multiple of forty two' do
+    assert_multiple_of_forty_two 420
   end
 end
 ```
@@ -1733,6 +1733,25 @@ class ProductTest < ActiveSupport::TestCase
 end
 ```
 
+### Asserting Time Arguments in Jobs
+
+When serializing job arguments, `Time`, `DateTime`, and `ActiveSupport::TimeWithZone` lose microsecond precision. This means comparing deserialized time with actual time doesn't always work. To compensate for the loss of precision, `assert_enqueued_with` and `assert_performed_with` will remove microseconds from time objects in argument assertions.
+
+```ruby
+require 'test_helper'
+
+class ProductTest < ActiveSupport::TestCase
+  include ActiveJob::TestHelper
+
+  test 'that product is reserved at a given time' do
+    now = Time.now
+    assert_performed_with(job: ReservationJob, args: [product, now]) do
+      product.reserve(now)
+    end
+  end
+end
+```
+
 Testing Action Cable
 --------------------