increase branch coverage for Lib_RLPReader

..by breaking its require(ments). RLP tests from https://github.com/ethereum/tests/tree/develop/RLPTests

packages/contracts/test/data/json/libraries/rlp/Lib_RLPReader.test.json

@@ -310,6 +310,50 @@
                         "0xca846b6579348476616c34"
                     ]
                 ]
+            },
+            "invalid rlp: not enough bytes for string length": {
+                "in": ["0xefdebd"],
+                "revert":"Invalid RLP short list."
+            },
+            "invalid rlp: expected string length to be greater than 55": {
+                "in": ["0xefb83600"],
+                "revert":"Invalid RLP short list."
+            },
+            "invalid rlp: not enough bytes for string": {
+                "in": ["0xefdebdaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"],
+                "revert":"Invalid RLP long list length."
+            },
+            "int32Overflow": {
+                "in": ["0xbf0f000000000000021111"],
+                "revert": "Invalid RLP long string."
+            },
+            "int32Overflow2": {
+                "in": ["0xff0f000000000000021111"],
+                "revert": "Invalid RLP long list."
+            }, 
+            "incorrectLengthInArray": {
+                "in": ["0xb9002100dc2b275d0f74e8a53e6f4ec61b27f24278820be3f82ea2110e582081b0565df0"],
+                "revert": "Invalid RLP list value."
+            },
+            "leadingZerosInLongLengthArray1": {
+                "in": ["0xb90040000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"],
+                "revert": "Invalid LP list value."
+            },
+            "leadingZerosInLongLengthArray2": {
+                "in": ["0xb800"],
+                "revert": "Invalid RLP list value."
+            },
+            "leadingZerosInLongLengthList1": {
+                "in": ["0xfb00000040000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"],
+                "revert": "Provided RLP list exceeds max list length."
+            },
+            "nonOptimalLongLengthArray1": {
+                "in": ["0xb81000112233445566778899aabbccddeeff"],
+                "revert": "Invalid RLP list value."
+            },
+            "nonOptimalLongLengthArray2": {
+                "in": ["0xb801ff"],
+                "revert": "Invalid RLP list value."
             }
         }
     }