hy/tests/native_tests/contrib/multi.hy

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;; Copyright 2019 the authors.
;; This file is part of Hy, which is free software licensed under the Expat
;; license. See the LICENSE.
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(require [hy.contrib.multi [defmulti defmethod default-method defn]])
(import pytest)
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(defn test-different-signatures []
"NATIVE: Test multimethods with different signatures"
(defmulti fun [&rest args]
(len args))
(defmethod fun 0 []
"Hello!")
(defmethod fun 1 [a]
a)
(defmethod fun 2 [a b]
"a b")
(defmethod fun 3 [a b c]
"a b c")
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(assert (= (fun) "Hello!"))
(assert (= (fun "a") "a"))
(assert (= (fun "a" "b") "a b"))
(assert (= (fun "a" "b" "c") "a b c")))
(defn test-different-signatures-defn []
"NATIVE: Test defn with different signatures"
(defn f1
([] "")
([a] "a")
([a b] "a b"))
(assert (= (f1) ""))
(assert (= (f1 "a") "a"))
(assert (= (f1 "a" "b") "a b"))
(with [(pytest.raises TypeError)]
(f1 "a" "b" "c")))
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(defn test-basic-dispatch []
"NATIVE: Test basic dispatch"
(defmulti area [shape]
(:type shape))
(defmethod area "square" [square]
(* (:width square)
(:height square)))
(defmethod area "circle" [circle]
(* (** (:radius circle) 2)
3.14))
(default-method area [shape]
0)
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(assert (< 0.784 (area {:type "circle" :radius 0.5}) 0.786))
(assert (= (area {:type "square" :width 2 :height 2})) 4)
(assert (= (area {:type "non-euclid rhomboid"}) 0)))
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(defn test-docs []
"NATIVE: Test if docs are properly handled"
(defmulti fun [a b]
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"docs"
a)
(defmethod fun "foo" [a b]
"foo was called")
(defmethod fun "bar" [a b]
"bar was called")
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(assert (= fun.--doc-- "docs")))
(defn test-kwargs-handling []
"NATIVE: Test handling of kwargs with multimethods"
(defmulti fun [&kwargs kwargs]
(get kwargs "type"))
(defmethod fun "foo" [&kwargs kwargs]
"foo was called")
(defmethod fun "bar" [&kwargs kwargs]
"bar was called")
(assert (= (fun :type "foo" :extra "extra") "foo was called")))
(defn test-basic-multi []
"NATIVE: Test a basic arity overloaded defn"
(defn f2
([] "Hello!")
([a] a)
([a b] "a b")
([a b c] "a b c"))
(assert (= (f2) "Hello!"))
(assert (= (f2 "a") "a"))
(assert (= (f2 "a" "b") "a b"))
(assert (= (f2 "a" "b" "c") "a b c")))
(defn test-kw-args []
"NATIVE: Test if kwargs are handled correctly for arity overloading"
(defn f3
([a] a)
([&optional [a "nop"] [b "p"]] (+ a b)))
(assert (= (f3 1) 1))
(assert (= (f3 :a "t") "t"))
(assert (= (f3 "hello " :b "world") "hello world"))
(assert (= (f3 :a "hello " :b "world") "hello world")))
(defn test-docs []
"NATIVE: Test if docs are properly handled for arity overloading"
(defn f4
"docs"
([a] (print a))
([a b] (print b)))
(assert (= f4.--doc-- "docs")))