test: add minimal json formatter test

Signed-off-by: Ryan Graham <[email protected]>

Author: rmg

test/fixtures/basic.json

@@ -0,0 +1,4 @@
+{"msg":"one"}
+{"msg":"two"}
+{"msg":"three"}
+{"msg":"four"}

test/test-json.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+
+cd $(dirname "${BASH_SOURCE[0]}")
+source common.sh
+
+mkdir -p sandbox
+node ../bin/sl-log-transformer.js --format=json < fixtures/basic.in > sandbox/json.test
+
+assert_exit 0 diff -u fixtures/basic.json sandbox/json.test