aSymbols
0	YHOO
1	AAPL

Symbols
0	YHOO
1	AAPL

UNIT TEST: test_market_chart
YHOO	YHOO   historical   historical   data   data
AAPL	AAPL   historical   historical   data   data

JSON is a string with value = "{"YHOO":{"historical":{"data":[]}},"AAPL":{"historical":{"data":[]}}}"

Benchmark: =1.0036