diff --git a/portfolio/portfolio_test.py b/portfolio/portfolio_test.py
index f06e5da..2cf3772 100644
--- a/portfolio/portfolio_test.py
+++ b/portfolio/portfolio_test.py
@@ -12,7 +12,7 @@ class TestPortfolio(unittest.TestCase):
         risk_per_trade = 0.02
         ticker = {}
         self.port = Portfolio(
-            ticker, base=base, leverage=leverage, 
+            ticker, base=base, leverage=leverage,
             equity=equity, risk_per_trade=risk_per_trade
         )
 
@@ -39,10 +39,11 @@ class TestPortfolio(unittest.TestCase):
 
     def test_add_position_units(self):
         side = "LONG"
+        market = "GBP/USD"
         units = 2000
         exposure = float(units)
-        add_price = 1.51928
-        remove_price = 1.51878
+        add_price = 1.51819
+        remove_price = 1.51770
 
         # Test for no position
         market = "EUR/USD"
@@ -52,16 +53,30 @@ class TestPortfolio(unittest.TestCase):
         )
         self.assertFalse(apu)
 
-        # Test for real position
+        # Add a position
         market = "GBP/USD"
+        self.port.add_new_position(
+            side, market, units, exposure,
+            add_price, remove_price
+        )
+        ps = self.port.positions[market]
+
+        # Test for real position
+        add_price = 1.52876
+        remove_price = 1.52821
+        extra_units = 2000
+        extra_exposure = float(extra_units) + exposure
         apu = self.port.add_position_units(
-            market, units, exposure,
+            market, extra_units, extra_exposure,
             add_price, remove_price
         )
         self.assertTrue(apu)
-        ps = self.port.positions[market]
 
-        self.assertAlmostEqual(ps.avg_price, 1.518735)
+        # Check the position members are correct/sane
+        self.assertAlmostEqual(ps.avg_price, 1.523475)
+        self.assertAlmostEqual(ps.cur_price, 1.52821)
+        self.assertEqual(ps.units, units + extra_units)
+        self.assertEqual(ps.exposure, exposure + extra_exposure)
 
 
 if __name__ == "__main__":