run_must_fail

Build a test block containing only this test transaction, asserting that the building fails (i.e. throws an exception).

Typically used to test operation calls that must throw an exception.

Build a test block containing only this test transaction, asserting that the building fails; i.e. throws an exception; with the given exception message.

Checks that the given message is a substring of the thrown message. For example my_tx.run_must_fail('out of bounds') succeeds if an exception with message Run-time error: List index out of bounds: 0 (size 0) is thrown.

Typically used to test operation calls that must throw an exception.

Parameters