Added power

test_unnecessarymath.py

@@ -8,3 +8,8 @@ def test_sqrt():
     assert um.sqrt(1.) == 1.
     assert um.sqrt(0.) == 0.
     assert um.sqrt(4.) == 2.
+
+def power_test():
+	assert um.power(3, 3) == 27
+	assert um.power(2, 4) == 16
+	assert um.power(5, 3) == 125
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