EUnit examples: 'with'
In earlier posts, Passing the result from ‘foreach’ and Passing the result from ‘setup’, I showed how to (awkwardly) pass the result from the setup function to the test functions.
It turns out that eunit provides a better way to do this, using with. Use it like this:
setup
The example is taken from some in-progress work on my erl509 library; the exact details don’t matter.
all_test_() ->
{setup, fun setup/0,
{with, [
fun subject_key_identifier/1,
fun authority_key_identifier/1
]}}.
setup() ->
% Create an RSA private key and derive the public key.
PrivateKey = erl509_private_key:create_rsa(2048),
PublicKey = erl509_private_key:derive_public_key(PrivateKey),
PublicKey.
subject_key_identifier(PublicKey) ->
% ...
ok.
foreach
As mentioned previously, foreach requires a list: [Test | Instantiator], so we need to wrap the with tuple in
another list:
all_test_() ->
{foreach, fun setup/0, [
{with, [
fun subject_key_identifier/1,
fun authority_key_identifier/1
]}]}.
Cleanup?
RSA public keys don’t need cleaning up, so I omitted the Cleanup element in the test generator.