add TestStringCodepointsIterable

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1816020 13f79535-47bb-0310-9956-ffa450edef68

src/testcases/org/apache/poi/util/TestStringCodepointsIterable.java

@@ -0,0 +1,45 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Unit test for StringCodepointsIterable
+ */
+public class TestStringCodepointsIterable {
+
+    @Test
+    public void testIterable() {
+        final String unicodeSurrogates = "\uD835\uDF4A\uD835\uDF4B\uD835\uDF4C\uD835\uDF4D\uD835\uDF4E"
+                + "abcdef123456";
+        StringCodepointsIterable sci = new StringCodepointsIterable(unicodeSurrogates);
+        List<String> codePoints = new ArrayList<>();
+        List<String> codePoints2 = new ArrayList<>();
+        sci.iterator().forEachRemaining(codePoints::add);
+        sci.iterator().forEachRemaining(codePoints2::add);
+        Assert.assertEquals(17, codePoints.size());
+        Assert.assertEquals(codePoints, codePoints2);
+    }
+
+}
+