
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2000, 100) == 100)
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2001, 100) == 27)
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2002, 100) == 42)
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2003, 100) == 27)
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2004, 100) == 38)
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2005, 100) == 113)
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2006, 100) == 254)
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2007, 100) == 349)
