Add test for #736

Author: cowtowncoder

src/test/java/com/fasterxml/jackson/failing/JsonPointerOOME736Test.java

@@ -0,0 +1,27 @@
+package com.fasterxml.jackson.failing;
+
+import com.fasterxml.jackson.core.*;
+import com.fasterxml.jackson.core.exc.StreamReadException;
+
+public class JsonPointerOOME736Test extends BaseTest
+{
+    // such as https://github.com/nst/JSONTestSuite/blob/master/test_parsing/n_structure_100000_opening_arrays.json
+    public void testDeepJsonPointer() throws Exception {
+        int MAX_DEPTH = 100000;
+        String INPUT = new String(new char[MAX_DEPTH]).replace("\0", "[");
+        JsonParser parser = createParser(MODE_READER, INPUT);
+        try {
+            while (true) {
+                parser.nextToken();
+            }
+        } catch (StreamReadException e) {
+            verifyException(e, "Unexpected end");
+            JsonStreamContext parsingContext = parser.getParsingContext();
+            JsonPointer jsonPointer = parsingContext.pathAsPointer(); // OOME
+            String pointer = jsonPointer.toString();
+            String expected = new String(new char[MAX_DEPTH - 1]).replace("\0", "/0");
+            assertEquals(expected, pointer);
+        }
+        parser.close();
+    }
+}