Unit Test Big Objects

Question

I have an APEX controller that writes to a Big Object. How do I unit this? During an insert operation insert I get an error:

Unsupported External Object Operations.

Answer 1

I found these two references in the documentation for Big Objects:

• Populate a Custom Big Object with Apex

Any Apex tests that use DML calls will fail and potentially insert bad data into the target big object. This data won’t be deletable. To test DML calls, use a mocking framework with the Apex stub API to contain calls to the target big object.

• Build a Mocking Framework with the Stub API

So it appears you will need to Mock the Big Objects for your test cases.