1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  23 
  24 /**
  25  * @test
  26  * @bug 8017231 8020977
  27  * @summary test  StringJoiner::merge
  28  * @run testng MergeTest
  29  */
  30 
  31 import java.util.StringJoiner;
  32 import java.util.stream.Stream;
  33 import org.testng.annotations.Test;
  34 import static org.testng.Assert.assertEquals;
  35 import static org.testng.Assert.fail;
  36 
  37 @Test
  38 public class MergeTest {
  39     public void testNull() {
  40         StringJoiner sj = new StringJoiner(",", "{", "}");
  41         try {
  42             sj.merge(null);
  43             fail("Should throw NullPointerException!");
  44         } catch (NullPointerException npe) {
  45             // expected
  46         }
  47     }
  48 
  49     public void testSimple() {
  50         StringJoiner sj = new StringJoiner(",", "{", "}");
  51         StringJoiner other = new StringJoiner(",", "[", "]");
  52         Stream.of("a", "b", "c").forEachOrdered(sj::add);
  53         Stream.of("d", "e", "f").forEachOrdered(other::add);
  54 
  55         sj.merge(other);
  56         assertEquals(sj.toString(), "{a,b,c,d,e,f}");
  57     }
  58 
  59     public void testEmptyOther() {
  60         StringJoiner sj = new StringJoiner(",", "{", "}");
  61         StringJoiner other = new StringJoiner(",", "[", "]");
  62         Stream.of("a", "b", "c").forEachOrdered(sj::add);
  63 
  64         sj.merge(other);
  65         assertEquals(sj.toString(), "{a,b,c}");
  66 
  67         other.setEmptyValue("EMPTY");
  68         sj.merge(other);
  69         assertEquals(sj.toString(), "{a,b,c}");
  70     }
  71 
  72     public void testEmptyThis() {
  73         StringJoiner sj = new StringJoiner(",", "{", "}");
  74         StringJoiner other = new StringJoiner(":", "[", "]");
  75         Stream.of("d", "e", "f").forEachOrdered(other::add);
  76 
  77         sj.merge(other);
  78         assertEquals(sj.toString(), "{d:e:f}");
  79 
  80         sj = new StringJoiner(",", "{", "}").setEmptyValue("EMPTY");
  81         assertEquals(sj.toString(), "EMPTY");
  82         sj.merge(other);
  83         assertEquals(sj.toString(), "{d:e:f}");
  84     }
  85 
  86     public void testEmptyBoth() {
  87         StringJoiner sj = new StringJoiner(",", "{", "}");
  88         StringJoiner other = new StringJoiner(":", "[", "]");
  89 
  90         sj.merge(other);
  91         assertEquals(sj.toString(), "{}");
  92 
  93         other.setEmptyValue("NOTHING");
  94         sj.merge(other);
  95         assertEquals(sj.toString(), "{}");
  96 
  97         sj = new StringJoiner(",", "{", "}").setEmptyValue("EMPTY");
  98         assertEquals(sj.toString(), "EMPTY");
  99         sj.merge(other);
 100         assertEquals(sj.toString(), "EMPTY");
 101     }
 102 
 103     public void testCascadeEmpty() {
 104         StringJoiner sj = new StringJoiner(",", "{", "}");
 105         StringJoiner o1 = new StringJoiner(":", "[", "]").setEmptyValue("Empty1");
 106         StringJoiner o2 = new StringJoiner(",", "<", ">").setEmptyValue("Empty2");
 107 
 108         o1.merge(o2);
 109         assertEquals(o1.toString(), "Empty1");
 110 
 111         sj.merge(o1);
 112         assertEquals(sj.toString(), "{}");
 113     }
 114 
 115     public void testDelimiter() {
 116         StringJoiner sj = new StringJoiner(",", "{", "}");
 117         StringJoiner other = new StringJoiner(":", "[", "]");
 118         Stream.of("a", "b", "c").forEachOrdered(sj::add);
 119         Stream.of("d", "e", "f").forEachOrdered(other::add);
 120 
 121         sj.merge(other);
 122         assertEquals(sj.toString(), "{a,b,c,d:e:f}");
 123     }
 124 
 125     public void testMergeSelf() {
 126         final StringJoiner sj = new StringJoiner(",", "[", "]").add("a").add("b");
 127         assertEquals(sj.merge(sj).toString(), "[a,b,a,b]");
 128         assertEquals(sj.merge(sj).toString(), "[a,b,a,b,a,b,a,b]");
 129 
 130         final StringJoiner sj2 = new StringJoiner(",").add("c").add("d");
 131         assertEquals(sj2.merge(sj2).toString(), "c,d,c,d");
 132     }
 133 }