斷言引發的clojure測試

Question

我有一個函數定義為：

(defn strict-get
  [m key]
  {:pre [(is (contains? m key))]}
  (get m key))

然后我對此進行了測試：

(is (thrown? java.lang.AssertionError (strict-get {} :abc)))

但是此測試失敗：

  ;; FAIL in () (myfile.clj:189)
  ;; throws exception when key is not present
  ;; expected: (contains? m key)
  ;; actual: (not (contains? {} :abc))

檢查斷言是否會引發錯誤需要什么？

Answer 1

由於嵌套兩個而導致斷言失敗的原因is 。 內is已經捕獲異常，所以外部is測試則因為沒有拋出失敗。

(defn strict-get
  [m key]
  {:pre [(contains? m key)]} ;; <-- fix
  (get m key))

---

(is (thrown? java.lang.AssertionError (strict-get {} nil)))
;; does not throw, but returns exception object for reasons idk

(deftest strict-get-test
  (is (thrown? java.lang.AssertionError (strict-get {} nil))))

(strict-get-test) ;; passes