ert: Defining Explanation Functions
5.1 Defining Explanation Functions
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The explanation function for a predicate is a function that takes the
same arguments as the predicate and returns an _explanation_. The
explanation should explain why the predicate, when invoked with the
arguments given to the explanation function, returns the value that it
returns. The explanation can be any object but should have a
comprehensible printed representation. If the return value of the
predicate needs no explanation for a given list of arguments, the
explanation function should return ‘nil’.
To associate an explanation function with a predicate, add the
property ‘ert-explainer’ to the symbol that names the predicate. The
value of the property should be the symbol that names the explanation
function.
Info Catalog
ert: Extending ERT
ert: Low-Level Functions for Working with Tests