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WIP: add if-let #852

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37 changes: 37 additions & 0 deletions test/clojure/core_test/if_let.cljc
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Original file line number Diff line number Diff line change
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(ns clojure.core-test.if-let
(:require [clojure.test :as t :refer [are deftest is testing]]
[clojure.core-test.portability #?(:cljs :refer-macros :default :refer) [when-var-exists]]))

(when-var-exists if-let
(deftest test-if-let
(testing "basic single-binding tests using vectors or nil"
(is (= [0 1 2 3 4] (if-let [x [0 1 2 3 4] ] x :else)))
(is (not (nil? (if-let [x [nil]] x :else))))
(is (= [] (if-let [x []] x :else)))
(is (= :else (if-let [x nil] x :else))))
(testing "basic single-binding tests using seqs"
(is (= '(0 1 2 3 4) (if-let [x (range 5)] x :else))))
(testing "unlike when-some, we're looking for logical false specifically, so false doesn't evaluate"
(is (= :else (if-let [x false] x :else))))
(testing "seq is only called once"
(let [calls (atom 0)
seq-fn (fn s [] (lazy-seq
(swap! calls inc)
(cons 1 (s))))
s (take 5 (seq-fn))]
(is (= '(1 1 1 1 1) (if-let [x s] x :else)))
(is (= @calls 5))))
(comment (testing "without a body, truth doesn't matter"
(is (nil? (if-let [x nil])))
(is (nil? (if-let [x [false]])))
(is (nil? (if-let [x [true]])))))
#?(:cljs nil ; Skipped due to ClojureScript's atypical macro expansion.
:default (testing "if-let accepts exactly two bindings"
(is (thrown? Exception
(macroexpand
'(if-let [x (range 5) y (range 5)]))))))
#?(:cljs nil ; Skipped due to ClojureScript's atypical macro expansion.
:default (testing "if-let accepts exactly two bindings"
(is (thrown? Exception
(macroexpand
'(if-let [x (range 5) y (range 5)]))))))))
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