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How to catch a dmlexception in apex class?
You’re also handling the exception in your SUT, so your test class wouldn’t be looking to catch an exception, but rather detect the message being added to ApexPage using ApexPages.getMessages () (not sure if Test.setCurrentPage () is also required in this case). You are trying to catch a DmlException.
Do you know how to throw an exception in apex?
You should really know a more specific type of Exception. If you are working out how to get the try block to throw an exception at all, see the bottom section. If you know calling a method will cause an Exception and want to make sure it is handled by that method, your assert (false) should be in the catch block, not try.
What causes exception to be thrown from Test class?
The general answer is that your provided code is causing an exception to be thrown from your test class rather than from inside the code that you’re testing. You need to present your SUT with an environment where it is guaranteed to throw your exception.
When to use false or try in apex?
If you know calling a method will cause an Exception and want to make sure it is handled by that method, your assert (false) should be in the catch block, not try. A common pattern is: Using this pattern, you always hit the desired assertion, which I see as a notable advantage.
How to test for catch exception GetMessage?
The inverse works, too; if testing insert, specify an Id. With the little code that you’ve provided, it’s impossible to determine exactly what you need to be doing to gain coverage for your SUT’s (system under test) catch block.
Which is an example of a catch exception?
The canonical example would be a DmlException. The way to hit the catch block is not to monkey around with your try block. Instead, you can pass a record you know will fail to update. For instance, one which has no Id. The inverse works, too; if testing insert, specify an Id.