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