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1 files changed, 13 insertions, 9 deletions

diff --git a/pint/testsuite/test_infer_base_unit.py b/pint/testsuite/test_infer_base_unit.py
index 12507b6..dc3bd82 100644
--- a/pint/testsuite/test_infer_base_unit.py
+++ b/pint/testsuite/test_infer_base_unit.py
@@ -6,23 +6,27 @@ from pint.util import infer_base_unit
 class TestInferBaseUnit(QuantityTestCase):
     def test_infer_base_unit(self):
         from pint.util import infer_base_unit
-        self.assertEqual(infer_base_unit(Q(1, 'millimeter * nanometer')), Q(1, 'meter**2').units)
+
+        self.assertEqual(
+            infer_base_unit(Q(1, "millimeter * nanometer")), Q(1, "meter**2").units
+        )
 
     def test_units_adding_to_zero(self):
-        self.assertEqual(infer_base_unit(Q(1, 'm * mm / m / um * s')), Q(1, 's').units)
+        self.assertEqual(infer_base_unit(Q(1, "m * mm / m / um * s")), Q(1, "s").units)
 
     def test_to_compact(self):
-        r = Q(1000000000, 'm') * Q(1, 'mm') / Q(1, 's') / Q(1, 'ms')
+        r = Q(1000000000, "m") * Q(1, "mm") / Q(1, "s") / Q(1, "ms")
         compact_r = r.to_compact()
-        expected = Q(1000., 'kilometer**2 / second**2')
+        expected = Q(1000.0, "kilometer**2 / second**2")
         self.assertQuantityAlmostEqual(compact_r, expected)
 
-        r = (Q(1, 'm') * Q(1, 'mm') / Q(1, 'm') / Q(2, 'um') * Q(2, 's')).to_compact()
-        self.assertQuantityAlmostEqual(r, Q(1000, 's'))
+        r = (Q(1, "m") * Q(1, "mm") / Q(1, "m") / Q(2, "um") * Q(2, "s")).to_compact()
+        self.assertQuantityAlmostEqual(r, Q(1000, "s"))
 
     def test_volts(self):
         from pint.util import infer_base_unit
-        r = Q(1, 'V') * Q(1, 'mV') / Q(1, 'kV')
+
+        r = Q(1, "V") * Q(1, "mV") / Q(1, "kV")
         b = infer_base_unit(r)
-        self.assertEqual(b, Q(1, 'V').units)
-        self.assertQuantityAlmostEqual(r, Q(1, 'uV'))
+        self.assertEqual(b, Q(1, "V").units)
+        self.assertQuantityAlmostEqual(r, Q(1, "uV"))