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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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/**

 * @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);

    }

}