add tests for math.exp2

Author: Turreted

Lib/test/test_math.py

@@ -501,6 +501,16 @@ def testExp(self):
         self.assertTrue(math.isnan(math.exp(NAN)))
         self.assertRaises(OverflowError, math.exp, 1000000)
 
+    def testExp2(self):
+        self.assertRaises(TypeError, math.exp2)
+        self.ftest('exp2(-1)', math.exp2(-1), 0.5)
+        self.ftest('exp2(0)', math.exp2(0), 1)
+        self.ftest('exp2(1)', math.exp2(1), 2)
+        self.assertEqual(math.exp2(INF), INF)
+        self.assertEqual(math.exp2(NINF), 0.)
+        self.assertTrue(math.isnan(math.exp2(NAN)))
+        self.assertRaises(OverflowError, math.exp2, 1000000)
+
     def testFabs(self):
         self.assertRaises(TypeError, math.fabs)
         self.ftest('fabs(-1)', math.fabs(-1), 1)