Port test_pow.py to PyUnit. From SF patch #662807

Lib/test/output/test_pow

-test_pow
-Testing integer mode...
-    Testing 2-argument pow() function...
-    Testing 3-argument pow() function...
-Testing long integer mode...
-    Testing 2-argument pow() function...
-    Testing 3-argument pow() function...
-Testing floating point mode...
-    Testing 3-argument pow() function...
-The number in both columns should match.
-3 3
--5 -5
--1 -1
-5 5
--3 -3
--7 -7
-
-3L 3L
--5L -5L
--1L -1L
-5L 5L
--3L -3L
--7L -7L
-
-

Lib/test/test_pow.py

-import sys
-from test import test_support
+import test.test_support, unittest
 
+class PowTest(unittest.TestCase):
 
-def powtest(type):
+    def powtest(self, type):
         if type != float:
-        print "    Testing 2-argument pow() function..."
             for i in range(-1000, 1000):
-            if pow(type(i), 0) != 1:
-                raise ValueError, 'pow('+str(i)+',0) != 1'
-            if pow(type(i), 1) != type(i):
-                raise ValueError, 'pow('+str(i)+',1) != '+str(i)
-            if pow(type(0), 1) != type(0):
-                raise ValueError, 'pow(0,'+str(i)+') != 0'
-            if pow(type(1), 1) != type(1):
-                raise ValueError, 'pow(1,'+str(i)+') != 1'
+                self.assertEquals(pow(type(i), 0), 1)
+                self.assertEquals(pow(type(i), 1), type(i))
+                self.assertEquals(pow(type(0), 1), type(0))
+                self.assertEquals(pow(type(1), 1), type(1))
 
             for i in range(-100, 100):
-            if pow(type(i), 3) != i*i*i:
-                raise ValueError, 'pow('+str(i)+',3) != '+str(i*i*i)
+                self.assertEquals(pow(type(i), 3), i*i*i)
 
             pow2 = 1
             for i in range(0,31):
-            if pow(2, i) != pow2:
-                raise ValueError, 'pow(2,'+str(i)+') != '+str(pow2)
+                self.assertEquals(pow(2, i), pow2)
                 if i != 30 : pow2 = pow2*2
 
             for othertype in int, long:
@@ -30,10 +23,7 @@ def powtest(type):
                     ii = type(i)
                     for j in range(1, 11):
                         jj = -othertype(j)
-                    try:
                         pow(ii, jj)
-                    except ValueError:
-                        raise ValueError, "pow(%s, %s) failed" % (ii, jj)
 
         for othertype in int, long, float:
             for i in range(1, 100):
@@ -41,21 +31,15 @@ def powtest(type):
                 exp = -othertype(i/10.0)
                 if exp == 0:
                     continue
-            try:
-                pow(zero, exp)
-            except ZeroDivisionError:
-                pass # taking zero to any negative exponent should fail
-            else:
-                raise ValueError, "pow(%s, %s) did not fail" % (zero, exp)
-
-    print "    Testing 3-argument pow() function..."
+                self.assertRaises(ZeroDivisionError, pow, zero, exp)
+
         il, ih = -20, 20
         jl, jh = -5,   5
         kl, kh = -10, 10
-    compare = cmp
+        asseq = self.assertEqual
         if type == float:
             il = 1
-        compare = test_support.fcmp
+            asseq = self.assertAlmostEqual
         elif type == int:
             jl = 0
         elif type == long:
@@ -65,61 +49,63 @@ def powtest(type):
                 for k in range(kl, kh+1):
                     if k != 0:
                         if type == float or j < 0:
-                        try:
-                            pow(type(i),j,k)
-                        except TypeError:
-                            pass
-                        else:
-                            raise ValueError, "expected TypeError from " + \
-                                "pow%r" % ((type(i), j, k),)
+                            self.assertRaises(TypeError, pow, type(i), j, k)
                             continue
-                    if compare(pow(type(i),j,k), pow(type(i),j)% type(k)):
-                        raise ValueError, "pow(" +str(i)+ "," +str(j)+ \
-                             "," +str(k)+ ") != pow(" +str(i)+ "," + \
-                             str(j)+ ") % " +str(k)
-
-
-print 'Testing integer mode...'
-powtest(int)
-print 'Testing long integer mode...'
-powtest(long)
-print 'Testing floating point mode...'
-powtest(float)
-
-# Other tests-- not very systematic
-
-print 'The number in both columns should match.'
-print `pow(3,3) % 8`, `pow(3,3,8)`
-print `pow(3,3) % -8`, `pow(3,3,-8)`
-print `pow(3,2) % -2`, `pow(3,2,-2)`
-print `pow(-3,3) % 8`, `pow(-3,3,8)`
-print `pow(-3,3) % -8`, `pow(-3,3,-8)`
-print `pow(5,2) % -8`, `pow(5,2,-8)`
-print
-
-print `pow(3L,3L) % 8`, `pow(3L,3L,8)`
-print `pow(3L,3L) % -8`, `pow(3L,3L,-8)`
-print `pow(3L,2) % -2`, `pow(3L,2,-2)`
-print `pow(-3L,3L) % 8`, `pow(-3L,3L,8)`
-print `pow(-3L,3L) % -8`, `pow(-3L,3L,-8)`
-print `pow(5L,2) % -8`, `pow(5L,2,-8)`
-print
-
-print
-
-for i in range(-10, 11):
+                        asseq(
+                            pow(type(i),j,k),
+                            pow(type(i),j)% type(k)
+                        )
+
+    def test_powint(self):
+        self.powtest(int)
+
+    def test_powlong(self):
+        self.powtest(long)
+
+    def test_powfloat(self):
+        self.powtest(float)
+
+    def test_other(self):
+        # Other tests-- not very systematic
+        self.assertEquals(pow(3,3) % 8, pow(3,3,8))
+        self.assertEquals(pow(3,3) % -8, pow(3,3,-8))
+        self.assertEquals(pow(3,2) % -2, pow(3,2,-2))
+        self.assertEquals(pow(-3,3) % 8, pow(-3,3,8))
+        self.assertEquals(pow(-3,3) % -8, pow(-3,3,-8))
+        self.assertEquals(pow(5,2) % -8, pow(5,2,-8))
+
+        self.assertEquals(pow(3L,3L) % 8, pow(3L,3L,8))
+        self.assertEquals(pow(3L,3L) % -8, pow(3L,3L,-8))
+        self.assertEquals(pow(3L,2) % -2, pow(3L,2,-2))
+        self.assertEquals(pow(-3L,3L) % 8, pow(-3L,3L,8))
+        self.assertEquals(pow(-3L,3L) % -8, pow(-3L,3L,-8))
+        self.assertEquals(pow(5L,2) % -8, pow(5L,2,-8))
+
+        for i in range(-10, 11):
             for j in range(0, 6):
                 for k in range(-7, 11):
                     if j >= 0 and k != 0:
-                o = pow(i,j) % k
-                n = pow(i,j,k)
-                if o != n: print 'Integer mismatch:', i,j,k
+                        self.assertEquals(
+                            pow(i,j) % k,
+                            pow(i,j,k)
+                        )
                     if j >= 0 and k != 0:
-                o = pow(long(i),j) % k
-                n = pow(long(i),j,k)
-                if o != n: print 'Integer mismatch:', i,j,k
+                        self.assertEquals(
+                            pow(long(i),j) % k,
+                            pow(long(i),j,k)
+                        )
 
-class TestRpow:
+    def test_bug643260(self):
+        class TestRpow:
             def __rpow__(self, other):
                 return None
-None ** TestRpow()      # Won't fail when __rpow__ invoked.  SF bug #643260.
+        None ** TestRpow() # Won't fail when __rpow__ invoked.  SF bug #643260.
+
+
+def test_main():
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(PowTest))
+    test.test_support.run_suite(suite)
+
+if __name__ == "__main__":
+    test_main()