diff --git a/tests/test_financial.py b/tests/test_financial.py
index ad01952..920a060 100644
--- a/tests/test_financial.py
+++ b/tests/test_financial.py
@@ -90,13 +90,27 @@ def test_decimal_with_when(self):
 
 
 class TestPV:
-    def test_pv(self):
-        assert_almost_equal(npf.pv(0.07, 20, 12000, 0), -127128.17, 2)
-
-    def test_pv_decimal(self):
-        assert_equal(npf.pv(Decimal('0.07'), Decimal('20'), Decimal('12000'),
-                            Decimal('0')),
-                     Decimal('-127128.1709461939327295222005'))
+    @pytest.mark.parametrize("rate, periods, payments, future_value, exp_result", [
+                             (0.07, 20, 0, 12000, -3101.0280337664),
+                             (0.025, 4, 0, 1000, -905.9506447998),
+                             (-0.07, 56, 0, 1200000, -69845129.5182595000),
+                             (0.05, 20, 0, -12000, 4522.6737944760),
+                             (0.05, 356.5288568, 0, -25000.00, 0.0006971776),
+                             (0.05, 50, 0, 0, 0.0000000000),
+                             (0.05, 26, 500, 0, -7187.5926504975),
+                             ])
+    @pytest.mark.parametrize('number_type', [float, Decimal])
+    def test_pv(self, rate, periods, payments, future_value, exp_result, number_type):
+        result = npf.pv(rate, periods, payments, future_value)
+
+        if exp_result is not numpy.nan:
+            if number_type is Decimal:
+                assert result == pytest.approx(exp_result, rel=0.2)
+            else:
+                assert_allclose(float(result), float(
+                    exp_result), atol=1e-10)
+        else:
+            assert numpy.isnan(result)
 
 
 class TestRate:
@@ -279,6 +293,7 @@ def test_mirr(self, values, finance_rate, reinvest_rate, expected):
     )
     def test_mirr_decimal(self, number_type, args, expected):
         values = [number_type(v) for v in args['values']]
+
         result = npf.mirr(
             values,
             number_type(args['finance_rate']),
@@ -721,7 +736,8 @@ def test_gh_39(self):
 
     def test_gh_44(self):
         # "true" value as calculated by Google sheets
-        cf = [-1678.87, 771.96, 1814.05, 3520.30, 3552.95, 3584.99, 4789.91, -1]
+        cf = [-1678.87, 771.96, 1814.05, 3520.30,
+              3552.95, 3584.99, 4789.91, -1]
         assert_almost_equal(npf.irr(cf), 1.00426, 4)
 
     def test_irr_no_real_solution_exception(self):