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How do you write a unit test for a trigger whose only function is to make a callout?


What is considered a best practice for writing a unit test (to maintain code coverage) on a trigger whose sole function is making a callout (Which also means it has to use a future method)? Neither futures or callouts can be tested so there really isn't anything to do.

What I've been doing is firing an add and/or update and just asserting that it added or updated correctly. Since there is also code to skip the callout if it's a test even this doesn't really test anything. Is this about the best we can hope for right now?

Attribution to: Ryan Elkins

Possible Suggestion/Solution #1

Both future methods and callouts can be unit tested.

To test future methods simply make your call to any future method between Test.startTest(); and Test.stopTest(); statements and the future method will return when Test.stopTest(); is called. See the documentation for the Test class here: System.Test

Testing callouts is a bit trickier though. Basically in your callout code you check to see if you're executing within a unit test context by checking Test.isRunningTest() and instead of getting your callout response from an HttpResponse.send() request, you return a pre-built test string instead. There's one example of this method here:

There's also an older example of callout unit testing that uses a static variable you set in your unit test. Just replace that static variable with a call to Test.isRunningTest() and their example works fairly well as well. That example can be found here:

Attribution to: E.J. Wilburn

Possible Suggestion/Solution #2

There's a new feature coming in the next version to make testing callouts easier:

Attribution to: Rich Unger
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