1 val urban_prices1 = CW6c.get_prices(List("BIDU"), 2004 to 2008)

     1 assert(get_prices(List("GOOG", "AAPL"), 2010 to 2012) ==

     2 val urban_prices2 = CW6c.get_prices(List("GOOG", "AAPL"), 2010 to 2012)

     2     List(List(Some(311.349976), Some(20.544939)), 

     3 val urban_prices3 = CW6c.get_prices(List("GOOG", "AAPL", "BIDU"), 2010 to 2012)

     3          List(Some(300.222351), Some(31.638695)), 

     4 

     4          List(Some(330.555054), Some(39.478039))))

     5 val urban_deltas1 = CW6c.get_deltas(urban_prices1)

     6 val urban_deltas2 = CW6c.get_deltas(urban_prices2)

     7 val urban_deltas3 = CW6c.get_deltas(urban_prices3)

     8 

     9 assert(CW6c.yearly_yield(urban_deltas1, 100, 0) == 100)

    10 assert(CW6c.yearly_yield(urban_deltas1, 100, 2) == 192)

    11 assert(CW6c.yearly_yield(urban_deltas2, 100, 0) == 125)

    12 assert(CW6c.yearly_yield(urban_deltas3, 100, 0) == 164)

    13 assert(CW6c.yearly_yield(urban_deltas3, 100, 1) == 119)

    14 

    15 val urban_inv1 = CW6c.investment(List("IBM", "BIDU"), 2004 to 2008, 100)

    16 val urban_inv2 = CW6c.investment(List("GOOG", "AAPL", "BIDU"), 2010 to 2012, 100)

    17 

    18 assert(urban_inv1 >= 295 && urban_inv1 <= 301)

    19 assert(urban_inv2 >= 194 && urban_inv2 <= 198)

    20