effective.core — com.eureton/effective 0.4.0

expect clj macro

(expect effect config)

Asserts modifications specified by config using the clojure.test API.

effect is a Clojure form representing the effect to test.

config is expected to be a collection of monitor configurations. Each of those to be a hashmap with the following keys:

key	required?	description
:to-change	yes	expression to evaluate
:from	no	expected value of :to-change
		before the effect
:to	no	expected value of :to-change
		after the effect
:by	no	expected numerical difference
		of :to-change before and
		after the effect

Examples:

(let [x (atom 10)]
  (expect (swap! x inc)
          [{:to-change @x
            :from 0
            :to 1}]))

The above expands to the following:

(let [x (atom 10)]
  (let [before-0 @x
        _ (swap! x inc)
        after-0 @x]
    (is (= 0 before-0) ":from check failed")
    (is (= 1 after-0) ":to check failed")))

---

(let [x (atom [:a :b :c])]
  (expect (swap! x pop)
          [{:to-change (count @x) :by -1}]))

The above expands to the following:

(let [before-0 (count @x)
      _ (swap! x pop)
      after-0 (count @x)]
  (is (= -1 (- after-0 before-0)) ":by check failed"))

---

(let [x (atom "ABC")]
  (expect (swap! x clojure.string/upper-case)
          [{:to-not-change @x}]))

The above expands to the following:

(let [x (atom "ABC")]
  (let [before-0 @x
        _ (swap! x clojure.string/upper-case)
        after-0 @x]
    (is (= after-0 before-0) ":to-not-change check failed")))