README.md

How Can One Test for An Expected Error

Error node locations may vary across time but one might still want to have a test to express that an error is expected.

This can be achieved using the :error attribute feature of tree-sitter that was introduced in version 0.22.0 of the tree-sitter CLI tool.

Below is a sample test.

================================================================================
Invalid comment

:error
:language(xml)
================================================================================

<error>
<!-- invalid -- -->
</error>

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There are more examples here.

References

• ahelwer's question
• Command: test -> Attributes
• File with examples