Fixes: #318 Add test cases for PresentationDigestAlreadyAnchored error #542
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Fix for- #318 .
This PR adds a new unit test to the pallet-statement module to verify that attempting to add a presentation with the same digest to a statement that already has a presentation with that digest results in the expected error:
Error::< Test >::PresentationDigestAlreadyAnchored.
The test covers the following scenarios:
Creates a statement.
Adds a presentation to the statement.
Attempts to add the same presentation (with the same digest) to the same statement again.
Asserts that the second add_presentation call fails with the expected error.
This test enhances the test coverage of the pallet-statement module and improves its overall quality.