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v/vlib/json/json_decode_test.v

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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]
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skip_field string [json: '-']
}
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 == []
}
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fn test_skip_should_be_ignored() {
data := '{"total_comments": 55, "id": 123, "skip_field": "foo"}'
mut task := json.decode(Task, data)!
assert task.id == 123
assert task.total_comments == 55
assert task.comments == []
assert task.skip_field == ''
}
//
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
}