bug5127: added test case for double underscore in JSON string

java/com.sap.sse.test/src/com/sap/sse/test/jsonsimple/TestNumericStringWithUnderscoresSerialization.java

@@ -0,0 +1,43 @@
+package com.sap.sse.test.jsonsimple;
+
+import static org.junit.Assert.assertEquals;
+
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+import org.junit.Test;
+
+/**
+ * We face a strange issue with JSON String literals that represent file names coming from an iPhone
+ * where the file name contains mostly digits, sometimes separated by two underscore characters.
+ * These literals, it seems, are not properly getting parsed on Safari on iPhones.<p>
+ * 
+ * Does this have to do with the possibility to use single underscores in numeric literals to
+ * separate groups of digits, where two consecutive underscores are forbidden?<p>
+ * 
+ * This test is asserting that at least no issues in this regard exist in the <tt>org.json.simple</tt>
+ * library we're using for (de-)serializtion on the server side.
+ * 
+ * @author Axel Uhl (d043530)
+ *
+ */
+public class TestNumericStringWithUnderscoresSerialization {
+    private static final String FILE_NAME = "fileName";
+
+    @Test
+    public void testDoubleUnderscoreInStringStartingWithDigits() throws ParseException {
+        assertSerializationOfValue("012__3456");
+        assertSerializationOfValue("012__3456.jpeg");
+        assertSerializationOfValue("012___3456");
+        assertSerializationOfValue("01__3456");
+    }
+
+    private void assertSerializationOfValue(final String value) throws ParseException {
+        final JSONObject o = new JSONObject();
+        o.put(FILE_NAME, value);
+        final String oAsJsonString = o.toJSONString();
+        final JSONParser parser = new JSONParser();
+        final JSONObject oParsed = (JSONObject) parser.parse(oAsJsonString);
+        assertEquals(value, oParsed.get(FILE_NAME));
+    }
+}