Hi, How would one make a test that asserts that the tested method is invalid? If i for example want to test the following (somewhat contrived) method: def only_valid_number(number) when is_number number do number end A simple success test is trivial: assert 5 == only_valid_number(5) But wh…

You could use flunk instead to check that the execution does not reach a certain point: try do only_valid_number("x") flunk("this should not have happened") catch _, _ -> :ok end

assert_raise.. ExUnit.Assertions — ExUnit v1.20.2

As I do guess this is as close to the right answer I will get it is (unfortunately) not what I’m after. The difference being that, as far as I understand, there is no way to not specify which exception specifically to expect. I would like to find a way to just throw stuff it should not except at th…

Perhaps I should rephrase my vision as: assert failure == only_valid_number(“5”) where failure is anything that does not return a valid response

My suggestion was not entirely right. You could write a expect_failure macro like this: defmodule ExpectFailure do defmacro expect_failure(ast) do quote do try do unquote(ast) flunk("This should has crashed: " <> unquote(Macro.to_string(ast))) rescue e in E…

This was a good idea! I’ve added it to the new version (0.15.0) and just published it to hex: assertions | Hex Assertions — Assertions v0.15.0

Elixir Programming Language Forum

Testing for expected failure

Questions & Help Questions

otuv December 18, 2019, 10:31pm 6

To bad you have to wrap it in stuff but this is it.