Ejemplo n.º 1
0
    def test_stock_dividend_yield_preferred(self):
        """
        Tests correct dividend yield calculation for `preferred` stock types.
        """

        # Make a mock object for testing.
        sGIN = Stock('GIN', 'preferred', 8, 0.02, 100)

        # A stock without trades has a default ticker price equal to its par
        # value. In this case, `preferred` stock types should have a price
        # earnings ratio equal to their par value.
        self.assertEqual(sGIN.dividend_yield(), 0.02)

        # Add some mock Trades.
        sGIN.buy(320, 95)
        sGIN.sell(180, 110)
        self.assertEqual(len(sGIN._trades), 2)

        # `preferred` stocks should not use the `common` calculation for
        # dividend yields...
        self.assertNotEqual(sGIN.dividend_yield(),
                            8 / ((320*95 + 180*110) / (320+180)))

        # ... instead, they should use the `preferred` calculation.
        self.assertEqual(sGIN.dividend_yield(),
                         (0.02 * 100) / ((320*95 + 180*110) / (320+180)))
Ejemplo n.º 2
0
    def test_stock_dividend_yield_common(self):
        """
        Tests correct dividend yield calculation for `common` stock types.
        """

        # Make a mock object for testing.
        sALE = Stock('ALE', 'common', 23, nan, 60)

        # A stock without trades has a default ticker price equal to its par
        # value.
        self.assertEqual(sALE.dividend_yield(), 23. / 60)

        # Add some mock Trades.
        sALE.buy(500, 25)
        sALE.sell(300, 15)
        self.assertEqual(len(sALE._trades), 2)

        # The dividend yield calculation should now use a ticker price
        # determined from the average trading price.
        self.assertEqual(sALE.dividend_yield(), 23. /
                         (((500*25)+(300*15))/(500+300)))