import json struct TestTwin { id int seed string pubkey string } struct TestTwins { mut: twins []TestTwin [required] } fn test_json_decode_fails_to_decode_unrecognised_array_of_dicts() { data := '[{"twins":[{"id":123,"seed":"abcde","pubkey":"xyzasd"},{"id":456,"seed":"dfgdfgdfgd","pubkey":"skjldskljh45sdf"}]}]' json.decode(TestTwins, data) or { assert err.msg() == "expected field 'twins' is missing" return } assert false } fn test_json_decode_works_with_a_dict_of_arrays() { data := '{"twins":[{"id":123,"seed":"abcde","pubkey":"xyzasd"},{"id":456,"seed":"dfgdfgdfgd","pubkey":"skjldskljh45sdf"}]}' res := json.decode(TestTwins, data) or { assert false exit(1) } assert res.twins[0].id == 123 assert res.twins[0].seed == 'abcde' assert res.twins[0].pubkey == 'xyzasd' assert res.twins[1].id == 456 assert res.twins[1].seed == 'dfgdfgdfgd' assert res.twins[1].pubkey == 'skjldskljh45sdf' } struct Mount { size u64 } fn test_decode_u64() ? { data := '{"size": 10737418240}' m := json.decode(Mount, data)? assert m.size == 10737418240 // println(m) } // pub struct Comment { pub mut: id string comment string } pub struct Task { mut: description string id int total_comments int file_name string [skip] comments []Comment [skip] } fn test_skip_fields_should_be_initialised_by_json_decode() ? { data := '{"total_comments": 55, "id": 123}' mut task := json.decode(Task, data)? assert task.id == 123 assert task.total_comments == 55 assert task.comments == [] } // struct DbConfig { host string dbname string user string } fn test_decode_error_message_should_have_enough_context_empty() { json.decode(DbConfig, '') or { assert err.msg().len < 2 return } assert false } fn test_decode_error_message_should_have_enough_context_just_brace() { json.decode(DbConfig, '{') or { assert err.msg() == '{' return } assert false } fn test_decode_error_message_should_have_enough_context_trailing_comma_at_end() { txt := '{ "host": "localhost", "dbname": "alex", "user": "alex", }' json.decode(DbConfig, txt) or { assert err.msg() == ' "user": "alex",\n}' return } assert false } fn test_decode_error_message_should_have_enough_context_in_the_middle() { txt := '{"host": "localhost", "dbname": "alex" "user": "alex", "port": "1234"}' json.decode(DbConfig, txt) or { assert err.msg() == 'ost", "dbname": "alex" "user":' return } assert false }