refactor(parser): convert functional tests to unit tests

tests/events/kinesisSingeEvent.json

@@ -0,0 +1,20 @@
+{
+    "Records": [
+        {
+            "kinesis": {
+                "kinesisSchemaVersion": "1.0",
+                "partitionKey": "1",
+                "sequenceNumber": "49590338271490256608559692538361571095921575989136588898",
+                "data": "eyJtZXNzYWdlIjogInRlc3QgbWVzc2FnZSIsICJ1c2VybmFtZSI6ICJ0ZXN0In0=",
+                "approximateArrivalTimestamp": 1545084650.987
+            },
+            "eventSource": "aws:kinesis",
+            "eventVersion": "1.0",
+            "eventID": "shardId-000000000006:49590338271490256608559692538361571095921575989136588898",
+            "eventName": "aws:kinesis:record",
+            "invokeIdentityArn": "arn:aws:iam::123456789012:role/lambda-role",
+            "awsRegion": "us-east-2",
+            "eventSourceARN": "arn:aws:kinesis:us-east-2:123456789012:stream/lambda-stream"
+        }
+    ]
+}