我的 Clojure 规范看起来像:
(spec/def ::global-id string?)
(spec/def ::part-of string?)
(spec/def ::type string?)
(spec/def ::value string?)
(spec/def ::name string?)
(spec/def ::text string?)
(spec/def ::date (spec/nilable (spec/and string? #(re-matches #"^\d{4}-\d{2}-\d{2}$" %))))
(spec/def ::interaction-name string?)
(spec/def ::center (spec/coll-of string? :kind vector? :count 2))
(spec/def ::context- (spec/keys :req [::global-id ::type]
:opt [::part-of ::center]))
(spec/def ::contexts (spec/coll-of ::context-))
(spec/def ::datasource string?)
(spec/def ::datasource- (spec/nilable (spec/keys :req [::global-id ::name])))
(spec/def ::datasources (spec/coll-of ::datasource-))
(spec/def ::location string?)
(spec/def ::location-meaning- (spec/keys :req [::global-id ::location ::contexts ::type]))
(spec/def ::location-meanings (spec/coll-of ::location-meaning-))
(spec/def ::context string?)
(spec/def ::context-association-type string?)
(spec/def ::context-association-name string?)
(spec/def ::priority string?)
(spec/def ::has-context- (spec/keys :req [::context ::context-association-type ::context-association-name ::priority]))
(spec/def ::has-contexts (spec/coll-of ::has-context-))
(spec/def ::fact- (spec/keys :req [::global-id ::type ::name ::value]))
(spec/def ::facts (spec/coll-of ::fact-))
(spec/def ::attribute- (spec/keys :req [::name ::type ::value]))
(spec/def ::attributes (spec/coll-of ::attribute-))
(spec/def ::fulltext (spec/keys :req [::global-id ::text]))
(spec/def ::feature- (spec/keys :req [::global-id ::date ::location-meanings ::has-contexts ::facts ::attributes ::interaction-name]
:opt [::fulltext]))
(spec/def ::features (spec/coll-of ::feature-))
(spec/def ::attribute- (spec/keys :req [::name ::type ::value]))
(spec/def ::attributes (spec/coll-of ::attribute-))
(spec/def ::ioi-slice string?)
(spec/def ::ioi- (spec/keys :req [::global-id ::type ::datasource ::features ::attributes ::ioi-slice]))
(spec/def ::iois (spec/coll-of ::ioi-))
(spec/def ::data (spec/keys :req [::contexts ::datasources ::iois]))
(spec/def ::data- ::data)
但它无法生成样本:
(spec/fdef data->graph
:args (spec/cat :data ::xml-spec/data-))
(println (stest/check `data->graph))
那么它将无法生成异常:
Couldn't satisfy such-that predicate after 100 tries.
使用
stest/check
自动生成规范非常方便,但如何在规范旁边也有生成器? 最佳答案
当您从规范生成数据时看到Couldn't satisfy such-that predicate after 100 tries.
错误时,常见的原因是s/and
规范,因为规范仅基于第一个内部规范为s/and
规范生成生成器。
该规范似乎最有可能导致这种情况,因为 s/and
中的第一个内部规范/谓词是 string?
,而以下谓词是正则表达式:
(s/def ::date (s/nilable (s/and string? #(re-matches #"^\d{4}-\d{2}-\d{2}$" %))))
如果您对
string?
生成器进行采样,您会发现它生成的内容不太可能与您的正则表达式匹配:(gen/sample (s/gen string?))
=> ("" "" "X" "" "" "hT9" "7x97" "S" "9" "1Z")
test.check 将尝试(默认情况下 100 次)获取满足
such-that
条件的值,然后抛出您看到的异常(如果不满足)。生成日期
您可以通过多种方式为此规范实现自定义生成器。这是一个 test.check 生成器,它将创建 ISO 本地日期字符串:
(def gen-local-date-str
(let [day-range (.range (ChronoField/EPOCH_DAY))
day-min (.getMinimum day-range)
day-max (.getMaximum day-range)]
(gen/fmap #(str (LocalDate/ofEpochDay %))
(gen/large-integer* {:min day-min :max day-max}))))
这种方法获取有效纪元天数的范围,使用它来控制
large-integer*
生成器的范围,然后 fmap
s LocalDate/ofEpochDay
在生成的整数上。(def gen-local-date-str
(gen/fmap #(-> (Instant/ofEpochMilli %)
(LocalDateTime/ofInstant ZoneOffset/UTC)
(.toLocalDate)
(str))
gen/large-integer))
这从默认的
large-integer
生成器开始,并使用 fmap
提供一个函数,该函数从生成的整数创建 java.time.Instant
,将其转换为 java.time.LocalDate
,并将其转换为恰好与您的日期字符串格式匹配的字符串。 (这在 Java 9 及更高版本上使用 java.time.LocalDate/ofInstant
稍微简单一些。)另一种方法可能使用 test.chuck 的 regex-based string generator 或不同的日期类/格式化程序。请注意,我的两个示例都将生成 -9999/+9999 之前/之后的年数,这与您的
\d{4}
年份正则表达式不匹配,但是生成器应该经常产生令人满意的值,这对您的用例可能无关紧要。有很多方法可以生成日期值!(gen/sample gen-local-date-str)
=>
("1969-12-31"
"1970-01-01"
"1970-01-01"
...)
使用带有规范的自定义生成器
然后您可以使用
s/with-gen
将此生成器与您的规范相关联:(s/def ::date
(s/nilable
(s/with-gen
(s/and string? #(re-matches #"^\d{4}-\d{2}-\d{2}$" %))
(constantly gen-local-date-str))))
(gen/sample (s/gen ::date))
=>
("1969-12-31"
nil ;; note that it also makes nils b/c it's wrapped in s/nilable
"1970-01-01"
...)
如果您不想将自定义生成器直接绑定(bind)到规范定义,您还可以为某些采用覆盖映射的规范函数提供“独立”自定义生成器:
(gen/sample (s/gen ::data {::date (constantly gen-local-date-str)}))
使用此规范和生成器,我能够生成更大的
::data
规范,尽管由于某些集合规范,输出非常大。您还可以使用规范中的 :gen-max
选项在生成期间控制它们的大小。关于clojure - 我的数据有复杂的规范 - 如何生成样本?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/55059517/