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-rw-r--r--guides/source/testing.md19
1 files changed, 19 insertions, 0 deletions
diff --git a/guides/source/testing.md b/guides/source/testing.md
index 1fad02812b..26448958ea 100644
--- a/guides/source/testing.md
+++ b/guides/source/testing.md
@@ -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
--------------------