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
-
-
-def powtest(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'
-
-        for i in range(-100, 100):
-            if pow(type(i), 3) != i*i*i:
-                raise ValueError, 'pow('+str(i)+',3) != '+str(i*i*i)
-
-        pow2 = 1
-        for i in range(0,31):
-            if pow(2, i) != pow2:
-                raise ValueError, 'pow(2,'+str(i)+') != '+str(pow2)
-            if i != 30 : pow2 = pow2*2
-
-        for othertype in int, long:
-            for i in range(-10, 0) + range(1, 10):
-                ii = type(i)
-                for j in range(1, 11):
-                    jj = -othertype(j)
-                    try:
+import test.test_support, unittest
+
+class PowTest(unittest.TestCase):
+
+    def powtest(self, type):
+        if type != float:
+            for i in range(-1000, 1000):
+                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):
+                self.assertEquals(pow(type(i), 3), i*i*i)
+
+            pow2 = 1
+            for i in range(0,31):
+                self.assertEquals(pow(2, i), pow2)
+                if i != 30 : pow2 = pow2*2
+
+            for othertype in int, long:
+                for i in range(-10, 0) + range(1, 10):
+                    ii = type(i)
+                    for j in range(1, 11):
+                        jj = -othertype(j)
                         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):
-            zero = type(0)
-            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..."
-    il, ih = -20, 20
-    jl, jh = -5,   5
-    kl, kh = -10, 10
-    compare = cmp
-    if type == float:
-        il = 1
-        compare = test_support.fcmp
-    elif type == int:
-        jl = 0
-    elif type == long:
-        jl, jh = 0, 15
-    for i in range(il, ih+1):
-        for j in range(jl, jh+1):
-            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),)
-                        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):
-    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
-            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
-
-class TestRpow:
-    def __rpow__(self, other):
-        return None
-None ** TestRpow()      # Won't fail when __rpow__ invoked.  SF bug #643260.
+
+        for othertype in int, long, float:
+            for i in range(1, 100):
+                zero = type(0)
+                exp = -othertype(i/10.0)
+                if exp == 0:
+                    continue
+                self.assertRaises(ZeroDivisionError, pow, zero, exp)
+
+        il, ih = -20, 20
+        jl, jh = -5,   5
+        kl, kh = -10, 10
+        asseq = self.assertEqual
+        if type == float:
+            il = 1
+            asseq = self.assertAlmostEqual
+        elif type == int:
+            jl = 0
+        elif type == long:
+            jl, jh = 0, 15
+        for i in range(il, ih+1):
+            for j in range(jl, jh+1):
+                for k in range(kl, kh+1):
+                    if k != 0:
+                        if type == float or j < 0:
+                            self.assertRaises(TypeError, pow, type(i), j, k)
+                            continue
+                        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:
+                        self.assertEquals(
+                            pow(i,j) % k,
+                            pow(i,j,k)
+                        )
+                    if j >= 0 and k != 0:
+                        self.assertEquals(
+                            pow(long(i),j) % k,
+                            pow(long(i),j,k)
+                        )
+
+    def test_bug643260(self):
+        class TestRpow:
+            def __rpow__(self, other):
+                return None
+        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()