expect_error

Error assertion with optional class and message filtering

Passes if expr is a VError. Optionally verifies the error class string and/or applies a regex pattern match against the error message.

Parameters

• expr (Any): The value to check (typically the result of an expression that may error).

• class (String): = “” Optional error class to match (e.g. "TypeError", "RuntimeError").

• message (String): = “” Optional regex pattern to match against the error message.

Returns

Expect_pass when all checks pass; Expect_stop otherwise.

Examples

assert(expect_error(error("boom")))
assert(expect_error(error("boom"), class = "GenericError"))
assert(expect_error(error("invalid value"), message = "invalid"))

See Also

expect_true, expect_type