Add test for (cbor) #186

cbor/src/test/java/com/fasterxml/jackson/dataformat/cbor/failing/BrokenLongBinary186Test.java

@@ -0,0 +1,42 @@
+package com.fasterxml.jackson.dataformat.cbor.failing;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.JsonToken;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.cbor.CBORConstants;
+import com.fasterxml.jackson.dataformat.cbor.CBORTestBase;
+
+// Mostly for [dataformats-binary#186]: corrupt encoding indicating humongous payload
+public class BrokenLongBinary186Test extends CBORTestBase
+{
+    private final ObjectMapper MAPPER = cborMapper();
+
+    // [dataformats-binary#186]
+    public void testCorruptVeryLongBinary() throws Exception
+    {
+        // Let's do 999,999,999 bytes to likely trigger failure
+        final int LONG_LEN = 999_999_999;
+        byte[] DOC = new byte[] {
+                        (byte) (CBORConstants.PREFIX_TYPE_BYTES | CBORConstants.SUFFIX_UINT32_ELEMENTS),
+                        (byte) (LONG_LEN >> 24),
+                        (byte) (LONG_LEN >> 16),
+                        (byte) (LONG_LEN >> 8),
+                        (byte) LONG_LEN,
+                        // but only include 2 bytes
+                        0, 0
+        };
+        JsonParser p = MAPPER.createParser(DOC);
+        assertEquals(JsonToken.VALUE_EMBEDDED_OBJECT, p.nextToken());
+        try {
+            p.getBinaryValue();
+            fail("Should fail");
+        } catch (JsonProcessingException e) {
+//            e.printStackTrace();
+
+            // 01-Dec-2020, tatu: Need to decide what kind of exception should be
+            //    produced...
+            verifyException(e, "foobar");
+        }
+    }
+}