Definition
Let A be a column in a dataset containing strings. Let B be a column in a dataset containing lists of strings. The column contains string test asserts that the list of strings in B contains the string in A on a per-row basis. For example:
Since “d” is not in the list [“a”, “b”, “c”], the test fails.
Taxonomy
- Task types: LLM, tabular classification, tabular regression, text classification.
- Availability: and .
Why it matters
- In particular for RAG LLM projects, the context retriever will return a list of the top K contexts. The column contains string test can be used to ensure that the context retriever returns at least one of the correct contexts.
Test configuration examples
If you are writing atests.json, here are a few valid configurations for the character length test:

