create unit test

src/test/java/org/codelibs/fess/util/StreamUtilTest.java

@@ -0,0 +1,36 @@
+package org.codelibs.fess.util;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Stream;
+
+import org.codelibs.fess.unit.UnitFessTestCase;
+
+public class StreamUtilTest extends UnitFessTestCase {
+
+    public void test_ofValues() {
+        String[] values = { "value1", "value2" };
+        Stream<String> stream = StreamUtil.of(values[0], values[1]);
+        Object[] array = stream.toArray();
+        for (int i = 0; i < 2; i++) {
+            assertEquals(values[i], array[i]);
+        }
+    }
+
+    public void test_ofNull() {
+        assertEquals(0, StreamUtil.of().toArray().length);
+        Object[] o = {};
+        assertEquals(0, StreamUtil.of(o).toArray().length);
+        Map<Object, Object> map = new HashMap<Object, Object>();
+        assertEquals(0, StreamUtil.of(map).toArray().length);
+    }
+
+    public void test_ofMap() {
+        Map<String, String> map = new HashMap<String, String>();
+        map.put("key1", "value1");
+        map.put("key2", "value2");
+        Stream<Map.Entry<String, String>> stream = StreamUtil.of(map);
+        stream.forEach(m -> assertEquals(map.get(m.getKey()), m.getValue()));
+    }
+
+}