Add numeric index parsing tests. Partial fix to #5.

Author: Mike McCabe

tests.json

@@ -111,6 +111,16 @@
       "patch": [{"op":" add", "path": "/2", "value": "bar"}],
       "expected": ["foo", "sil", "bar"] },
 
+    { "comment": "test against implementation-specific numeric parsing",
+      "doc": {"1e0": "foo"},
+      "patch": [{"op": "test", "path": "/1e0", "value": "foo"}],
+      "expected": {"1e0": "foo"} },
+
+    { "comment": "test with bad number should fail",
+      "doc": ["foo", "bar"],
+      "patch": [{"op": "test", "path": "/1e0", "value": "bar"}],
+      "error": "test op shouldn't get array element 1" },
+
     { "doc": ["foo", "sil"],
       "patch": [{"op": "add", "path": "/bar", "value": 42}],
       "error": "Object operation on array target" },