strojure.assertie.core — com.github.strojure/assertie 1.0.0

Core assert macros.

assert-expr clj/s macro

(assert-expr expr)

(assert-expr expr message)

Evaluates expr and throws an exception if it does not evaluate to logical true. Similar to clojure.core/assert but with better reporting. Returns true to be used directly in :pre/:post conditions. Attaches failed :asserting/value (false or nil) in ex-data.

(assert-expr (= 1 (inc 0)))
;=> true

(assert-expr (= 1 2) "Expect 1=2")
;Expect 1=2 - Assert failed: (assert-expr (= 1 2))
; #:asserting{:value false}

assert-pred clj/s macro

(assert-pred x pred)

(assert-pred x pred message)

Evaluates (pred x) and throws an exception if it does not evaluate to logical true. Returns true to be used directly in :pre/:post conditions. Attaches failed :asserting/value and :asserting/type in ex-data.

(assert-pred "1" string?)
;=> true

(assert-pred (inc 0) string? "Expect string")
;Expect string - Assert failed: (assert-pred (inc 0) string?)
; #:asserting{:value 1, :type java.lang.Long}

not-thrown clj/s

(not-thrown f)

Returns predicate function which is true if (f x) does not throw exception. Can be used to assert expressions for errorless flow instead of truthy result.

(assert-pred [] first)
;Assert failed: (assert-pred [] first)

(assert-pred [] (not-thrown first))
;=> true

(assert-pred 1 (not-thrown first))
;Assert failed: (assert-pred 1 (not-thrown first))
; #:asserting{:value 1, :type java.lang.Long}
;Don't know how to create ISeq from: java.lang.Long