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Java example source code file (ns_libs.clj)

This example Java source code file (ns_libs.clj) is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

all, compilerexception, exception, frantisek, illegalaccesserror, illegalstateexception, integer, myrecord, reimportme, rich, string, stringbuffer, stuart

The ns_libs.clj Java example source code

;   Copyright (c) Rich Hickey. All rights reserved.
;   The use and distribution terms for this software are covered by the
;   Eclipse Public License 1.0 (
;   which can be found in the file epl-v10.html at the root of this distribution.
;   By using this software in any fashion, you are agreeing to be bound by
;   the terms of this license.
;   You must not remove this notice, or any other, from this software.

; Authors: Frantisek Sodomka, Stuart Halloway

(ns clojure.test-clojure.ns-libs
  (:use clojure.test))


; in-ns ns create-ns
; alias import intern refer
; all-ns find-ns
; ns-name ns-aliases ns-imports ns-interns ns-map ns-publics ns-refers
; resolve ns-resolve namespace
; ns-unalias ns-unmap remove-ns


; require use
; loaded-libs

(deftest test-alias
	(is (thrown-with-msg? Exception #"No namespace: epicfail found" (alias 'bogus 'epicfail))))
(deftest test-require
         (is (thrown? Exception (require :foo)))
         (is (thrown? Exception (require))))

(deftest test-use
         (is (thrown? Exception (use :foo)))
         (is (thrown? Exception (use))))

(deftest reimporting-deftypes
  (let [inst1 (binding [*ns* *ns*]
                (eval '(do (ns exporter)
                           (defrecord ReimportMe [a])
                           (ns importer)
                           (import exporter.ReimportMe)
                           (ReimportMe. 1))))
        inst2 (binding [*ns* *ns*]
                (eval '(do (ns exporter)
                           (defrecord ReimportMe [a b])
                           (ns importer)
                           (import exporter.ReimportMe)
                           (ReimportMe. 1 2))))]
    (testing "you can reimport a changed class and see the changes"
      (is (= [:a] (keys inst1)))
      (is (= [:a :b] (keys inst2))))
    ;fragile tests, please fix
    #_(testing "you cannot import same local name from a different namespace"
      (is (thrown? clojure.lang.Compiler$CompilerException
                  #"ReimportMe already refers to: class exporter.ReimportMe in namespace: importer"
                  (binding [*ns* *ns*]
                    (eval '(do (ns exporter-2)
                               (defrecord ReimportMe [a b])
                               (ns importer)
                               (import exporter-2.ReimportMe)
                               (ReimportMe. 1 2)))))))))

(deftest naming-types
  (testing "you cannot use a name already referred from another namespace"
    (is (thrown-with-msg? IllegalStateException
                          #"String already refers to: class java.lang.String"
                          (definterface String)))
    (is (thrown-with-msg? IllegalStateException
                          #"StringBuffer already refers to: class java.lang.StringBuffer"
                          (deftype StringBuffer [])))
    (is (thrown-with-msg? IllegalStateException
                          #"Integer already refers to: class java.lang.Integer"
                          (defrecord Integer [])))))

(deftest resolution
  (let [s (gensym)]
    (are [result expr] (= result expr)
         #'clojure.core/first (ns-resolve 'clojure.core 'first)
         nil (ns-resolve 'clojure.core s)
         nil (ns-resolve 'clojure.core {'first :local-first} 'first)
         nil (ns-resolve 'clojure.core {'first :local-first} s))))
(deftest refer-error-messages
  (let [temp-ns (gensym)]
    (binding [*ns* *ns*]
      (in-ns temp-ns)
      (eval '(def ^{:private true} hidden-var)))
    (testing "referring to something that does not exist"
      (is (thrown-with-msg? IllegalAccessError #"nonexistent-var does not exist"
            (refer temp-ns :only '(nonexistent-var)))))
    (testing "referring to something non-public"
      (is (thrown-with-msg? IllegalAccessError #"hidden-var is not public"
            (refer temp-ns :only '(hidden-var)))))))

(deftest test-defrecord-deftype-err-msg
  (is (thrown-with-msg? clojure.lang.Compiler$CompilerException
                        #"defrecord and deftype fields must be symbols, user\.MyRecord had: :shutdown-fn, compiling:"
                        (eval '(defrecord MyRecord [:shutdown-fn]))))
  (is (thrown-with-msg? clojure.lang.Compiler$CompilerException
                        #"defrecord and deftype fields must be symbols, user\.MyType had: :key1, compiling:"
                        (eval '(deftype MyType [:key1])))))

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