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For code that uses Zotonic models, use the repository's existing test setup and a dedicated site context. Clean up created resources so later tests do not depend on execution order.<\/p>\n

Select a known test module with the supported test runner. Check that the runner actually discovers it: this workspace's runtests<\/code> command scans the core apps\/zotonic_*\/test<\/code> directories, not every user application's test directory.<\/p>\n

For the pure filter example, create test\/filter_garden_label_tests.erl<\/code> in the Garden application:<\/p>\n

-module(filter_garden_label_tests).\n-include_lib("eunit\/include\/eunit.hrl").\n\nlabel_test() ->\n    ?assertEqual(<<"Open to visitors">>,\n        filter_garden_label:garden_label(<<"open">>, undefined)),\n    ?assertEqual(<<"Check visiting times">>,\n        filter_garden_label:garden_label(undefined, undefined)).\n<\/code><\/pre>\n
After building the application, compile this test into a temporary directory and run it with the application's ebin<\/code> on the path:<\/p>\n
mkdir -p \/tmp\/garden-eunit\nerlc -o \/tmp\/garden-eunit apps_user\/zotonic_mod_garden\/test\/filter_garden_label_tests.erl\nerl -noshell -pa _build\/default\/lib\/zotonic_mod_garden\/ebin \/tmp\/garden-eunit -eval 'case eunit:test(filter_garden_label_tests, [verbose]) of ok -> halt(0); _ -> halt(1) end.'\n<\/code><\/pre>\n
Expect one passing EUnit test. These commands run a pure helper test without a site; use the site's integration test setup for database or permission behaviour.<\/p>"}},"category_id":{"id":317,"is_a":["meta","category"],"name":"developerguide","title":"Developer guide","uri":"https:\/\/zotonic.com\/id\/developerguide"},"content_group_id":{"id":339,"is_a":["meta","content_group"],"name":"default_content_group","title":{"_type":"trans","tr":{"en":"Default Content Group"}},"uri":"https:\/\/zotonic.com\/id\/default_content_group"},"created":"2026-10-07T11:12:57Z","creator_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"doc_editorial_bundle":true,"doc_editorial_edges":{"relation":[2983,3029],"subject":[2554,2564,2613,2640]},"is_authoritative":true,"is_dependent":false,"is_featured":false,"is_protected":false,"is_published":true,"is_unfindable":false,"language":["en"],"modified":"2026-10-07T20:45:40Z","modifier_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"name":"developer_testing_erlang","pivot_geocode":null,"pivot_location_lat":null,"pivot_location_lng":null,"privacy":0,"publication_end":"9999-06-01T00:00:00Z","publication_start":"2026-10-07T11:12:57Z","slug":"test-erlang-behavior-with-focused-examples","summary":{"_type":"trans","tr":{"en":"Keep domain logic in small functions that accept explicit inputs. Test expected results, boundary values, and meaningful error cases without starting a full site when the function does not need one."}},"title":{"_type":"trans","tr":{"en":"Test Erlang behavior with focused examples"}},"title_slug":{"_type":"trans","tr":{"en":"test-erlang-behavior-with-focused-examples"}},"tz":"UTC","uri":null,"version":17,"visible_for":0},"uri":"https:\/\/zotonic.com\/id\/2984","uri_template":"https:\/\/zotonic.com\/id\/:id","websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/2984"}},"status":"ok"}