Migrate test block 9 to Dart 2.0

tests/corelib_strong/int_modulo_arith_test.dart

-// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import "package:expect/expect.dart";
-
-import "dart:math" show pow;
-
-var smallNumber = 1234567890; //   is 31-bit integer.
-var mediumNumber = 1234567890123456; // is 53-bit integer
-var bigNumber = 590295810358705600000; // is > 64-bit integer, exact as double.
-
-testModPow() {
-  test(x, e, m, expectedResult) {
-    // Check that expected result is correct, using an unoptimized version.
-    assert(() {
-      if (1 is double) return true; // Don't have bignums.
-      slowModPow(x, e, m) {
-        var r = 1;
-        while (e > 0) {
-          if (e.isOdd) r = (r * x) % m;
-          e >>= 1;
-          x = (x * x) % m;
-        }
-        return r;
-      }
-
-      return slowModPow(x, e, m) == expectedResult;
-    });
-    var result = x.modPow(e, m);
-    Expect.equals(expectedResult, result, "$x.modPow($e, $m)");
-  }
-
-  test(10, 20, 1, 0);
-  test(1234567890, 1000000001, 19, 11);
-  test(1234567890, 19, 1000000001, 122998977);
-  test(19, 1234567890, 1000000001, 619059596);
-  test(19, 1000000001, 1234567890, 84910879);
-  test(1000000001, 19, 1234567890, 872984351);
-  test(1000000001, 1234567890, 19, 0);
-  test(12345678901234567890, 10000000000000000001, 19, 2);
-  test(12345678901234567890, 19, 10000000000000000001, 3239137215315834625);
-  test(19, 12345678901234567890, 10000000000000000001, 4544207837373941034);
-  test(19, 10000000000000000001, 12345678901234567890, 11135411705397624859);
-  test(10000000000000000001, 19, 12345678901234567890, 2034013733189773841);
-  test(10000000000000000001, 12345678901234567890, 19, 1);
-  test(12345678901234567890, 19, 10000000000000000001, 3239137215315834625);
-  test(12345678901234567890, 10000000000000000001, 19, 2);
-  test(123456789012345678901234567890, 123456789012345678901234567891,
-      123456789012345678901234567899, 116401406051033429924651549616);
-  test(123456789012345678901234567890, 123456789012345678901234567899,
-      123456789012345678901234567891, 123456789012345678901234567890);
-  test(123456789012345678901234567899, 123456789012345678901234567890,
-      123456789012345678901234567891, 35088523091000351053091545070);
-  test(123456789012345678901234567899, 123456789012345678901234567891,
-      123456789012345678901234567890, 18310047270234132455316941949);
-  test(123456789012345678901234567891, 123456789012345678901234567899,
-      123456789012345678901234567890, 1);
-  test(123456789012345678901234567891, 123456789012345678901234567890,
-      123456789012345678901234567899, 40128068573873018143207285483);
-}
-
-testModInverse() {
-  test(x, m, expectedResult) {
-    //print("$x op $m == $expectedResult");
-    // Check that expectedResult is an inverse.
-    assert(expectedResult < m);
-    // The 1 % m handles the m = 1 special case.
-    // This test may overflow if we don't have bignums, so only run on VM.
-    assert(1 is double || (((x % m) * expectedResult) - 1) % m == 0);
-
-    var result = x.modInverse(m);
-    Expect.equals(expectedResult, result, "$x modinv $m");
-
-    if (x > m) {
-      x = x % m;
-      var result = x.modInverse(m);
-      Expect.equals(expectedResult, result, "$x modinv $m");
-    }
-  }
-
-  testThrows(x, m) {
-    // Throws if not co-prime, which is a symmetric property.
-    Expect.throws(() => x.modInverse(m), null, "$x modinv $m");
-    Expect.throws(() => m.modInverse(x), null, "$m modinv $x");
-  }
-
-  test(1, 1, 0);
-
-  testThrows(0, 1000000001);
-  testThrows(2, 4);
-  testThrows(99, 9);
-  testThrows(19, 1000000001);
-  testThrows(123456789012345678901234567890, 123456789012345678901234567899);
-
-  // Co-prime numbers
-  test(1234567890, 19, 11);
-  test(1234567890, 1000000001, 189108911);
-  test(19, 1234567890, 519818059);
-  test(1000000001, 1234567890, 1001100101);
-
-  test(12345, 12346, 12345);
-  test(12345, 12346, 12345);
-
-  test(smallNumber, 137, 42);
-  test(137, smallNumber, 856087223);
-  test(mediumNumber, 137, 77);
-  test(137, mediumNumber, 540686667207353);
-  test(bigNumber, 137, 128); //                 //# bignum: ok
-  // Bigger numbers as modulo is tested in big_integer_arith_vm_test.dart.
-  // Big doubles are not co-prime, so there is nothing to test for dart2js.
-}
-
-testGcd() {
-  // Call testFunc with all combinations and orders of plus/minus
-  // value and other.
-  callCombos(value, other, testFunc) {
-    testFunc(value, other);
-    testFunc(value, -other);
-    testFunc(-value, other);
-    testFunc(-value, -other);
-    if (value == other) return;
-    testFunc(other, value);
-    testFunc(other, -value);
-    testFunc(-other, value);
-    testFunc(-other, -value);
-  }
-
-  // Test that gcd of value and other (non-negative) is expectedResult.
-  // Tests all combinations of positive and negative values and order of
-  // operands, so use positive values and order is not important.
-  test(value, other, expectedResult) {
-    // Check for bug in test.
-    assert(expectedResult == 0 || value % expectedResult == 0);
-    assert(expectedResult == 0 || other % expectedResult == 0);
-    callCombos(value, other, (a, b) {
-      var result = a.gcd(b);
-
-      /// Check that the result is a divisor.
-      Expect.equals(0, result == 0 ? a : a % result, "$result | $a");
-      Expect.equals(0, result == 0 ? b : b % result, "$result | $b");
-      // Check for bug in test. If assert fails, the expected value is too low,
-      // and the gcd call has found a greater common divisor.
-      assert(result >= expectedResult);
-      Expect.equals(expectedResult, result, "$a.gcd($b)");
-    });
-  }
-
-  // Test that gcd of value and other (non-negative) throws.
-  testThrows(value, other) {
-    callCombos(value, other, (a, b) {
-      Expect.throws(() => a.gcd(b), null, "$a.gcd($b)");
-    });
-  }
-
-  testThrows(2.5, 5); // Not a method on double.
-  testThrows(5, 2.5); // Not accepting non-int arguments.
-
-  // Format:
-  //  test(value1, value2, expectedResult);
-  test(1, 1, 1); //     both are 1
-  test(1, 2, 1); //     one is 1
-  test(3, 5, 1); //     coprime.
-  test(37, 37, 37); // Same larger prime.
-
-  test(9999, 7272, 909); // Larger numbers
-
-  test(0, 1000, 1000); // One operand is zero.
-  test(0, 0, 0); //        Both operands are zero.
-
-  // Multiplying both operands by a number multiplies result by same number.
-  test(693, 609, 21);
-  test(693 << 5, 609 << 5, 21 << 5);
-  test(693 * 937, 609 * 937, 21 * 937);
-  test(693 * pow(2, 32), 609 * pow(2, 32), 21 * pow(2, 32));
-  test(693 * pow(2, 52), 609 * pow(2, 52), 21 * pow(2, 52));
-  test(693 * pow(2, 53), 609 * pow(2, 53), 21 * pow(2, 53)); // Regression.
-  test(693 * pow(2, 99), 609 * pow(2, 99), 21 * pow(2, 99));
-
-  test(1234567890, 19, 1);
-  test(1234567890, 1000000001, 1);
-  test(19, 1000000001, 19);
-
-  test(0x3FFFFFFF, 0x3FFFFFFF, 0x3FFFFFFF);
-  test(0x3FFFFFFF, 0x40000000, 1);
-
-  test(pow(2, 54), pow(2, 53), pow(2, 53));
-
-  test((pow(2, 52) - 1) * pow(2, 14), (pow(2, 26) - 1) * pow(2, 22),
-      (pow(2, 26) - 1) * pow(2, 14));
-}
-
-main() {
-  testModPow(); // //# modPow: ok
-  testModInverse();
-  testGcd();
-}