[test] updated test on overflow of fixed 'decode_size_limit_bytes' to not raise an error bu create an Event, tag it appropriately and slice the offending data into 'message' field

Author: andsel

spec/codecs/json_lines_spec.rb

@@ -127,6 +127,13 @@
           subject.decode(maximum_payload)
         }.not_to raise_error
       end
+
+      it "should raise an error if the max bytes are exceeded" do
+        subject.decode(maximum_payload << "z") do |event|
+          expect(event.get("tags")).to include("_jsonparse_too_big_failure")
+          expect(event.get("message").size).to eq(decode_size_limit_bytes)
+        end
+      end
 
       it "should raise an error if the max bytes are exceeded" do
         expect {