127 lines
4.9 KiB
Java
127 lines
4.9 KiB
Java
/*
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* Copyright (c) 2013, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 5015163 8267529
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* @summary test String merge/join that is the inverse of String.split()
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* @run testng StringJoinTest
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* @author Jim Gish
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*/
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import java.util.ArrayList;
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import java.util.List;
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import java.util.StringJoiner;
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import org.testng.annotations.Test;
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import static org.testng.Assert.*;
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@Test(groups = {"unit","string","lang","libs"})
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public class StringJoinTest {
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private static final String DASH = "-";
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private static final String BEGIN = "Hi there";
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private static final String JIM = "Jim";
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private static final String JOHN = "John";
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private static final String AND_JOE = "and Joe";
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private static final String BILL = "Bill";
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private static final String BOB = "Bob";
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private static final String AND_BO = "and Bo";
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private static final String ZEKE = "Zeke";
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private static final String ZACK = "Zack";
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private static final String AND_ZOE = "and Zoe";
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/**
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* Tests the join() methods on String
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*/
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public void testJoinStringVarargs() {
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// check a non-null join of String array (var-args) elements
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String expectedResult = BEGIN + DASH + JIM + DASH + JOHN + DASH + AND_JOE;
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String result = String.join(DASH, BEGIN, JIM, JOHN, AND_JOE);
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assertEquals(result, expectedResult, "BEGIN.join(DASH, JIM, JOHN, AND_JOE)");
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// test with just one element
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assertEquals(String.join(DASH, BEGIN), BEGIN);
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}
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public void testJoinStringArray() {
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// check a non-null join of Object[] with String elements
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String[] theBs = {BILL, BOB, AND_BO};
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String result = String.join(DASH, theBs);
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String expectedResult = BILL + DASH + BOB + DASH + AND_BO;
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assertEquals(result, expectedResult, "String.join(DASH, theBs)");
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}
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public void testJoinEmptyStringArray() {
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// check a non-null join of Object[] with String elements
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String[] empties = {};
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String result = String.join(DASH, empties);
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assertEquals(result, "", "String.join(DASH, empties)");
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}
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@Test(expectedExceptions = {NullPointerException.class})
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public void testJoinNullStringArray() {
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// check a non-null join of Object[] with String elements
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String[] empties = null;
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String result = String.join(DASH, empties);
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}
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@Test(expectedExceptions = {NullPointerException.class})
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public void testJoinNullIterableStringList() {
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// check join of an Iterables
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List<CharSequence> theZsList = null;
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String.join(DASH, theZsList);
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}
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public void testJoinIterableStringList() {
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// check join of an Iterables
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List<CharSequence> theZsList = new ArrayList<>();
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theZsList.add(ZEKE);
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theZsList.add(ZACK);
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theZsList.add(AND_ZOE);
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assertEquals(String.join(DASH, theZsList), ZEKE + DASH + ZACK + DASH
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+ AND_ZOE, "String.join(DASH, theZsList))");
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}
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public void testJoinNullStringList() {
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List<CharSequence> nullList = null;
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try {
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assertEquals( String.join( DASH, nullList ), "null" );
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fail("Null container should cause NPE");
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} catch (NullPointerException npe) {}
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assertEquals(String.join(DASH, null, null), "null" + DASH + "null");
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}
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@Test(expectedExceptions = {NullPointerException.class})
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public void testJoinNullDelimiter() {
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String.join(null, JIM, JOHN);
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}
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public void testIgnoreDelimiterCoderJoin() {
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// 8267529: Ensure that joining zero or one latin-1 Strings with a UTF-16
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// delimiter produce a String with a latin-1 coder, since the delimiter
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// is not added.
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assertEquals("", new StringJoiner("\u2013").toString());
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assertEquals("foo", new StringJoiner("\u2013").add("foo").toString());
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assertEquals("", String.join("\u2013"));
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assertEquals("foo", String.join("\u2013", "foo"));
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}
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}
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