testStatisticsFunctions method Null safety

Implementation

Future<void> testStatisticsFunctions() async {
  await test('15c statistics functions', () async {
    final m = newModel();
    await _testOneArgFloat(m, Operations15.xFactorial, 0, 1);
    await _testOneArgFloat(m, Operations15.xFactorial, 1, 1);
    await _testOneArgFloat(m, Operations15.xFactorial, 9, 362880);
    await _testOneArgFloat(m, Operations15.xFactorial, 0.5, 0.8862269255);
    await _testOneArgFloat(m, Operations15.xFactorial, -0.7, 2.991568988);
    await _testOneArgFloat(
        m, Operations15.xFactorial, -31.2, -1.016536828e-32);
    await _testOneArgFloat(m, Operations15.xFactorial, 57.3, 1.367681189e77);
    await expect(m.getFlag(9), false);
    await _testOneArgFloat(m, Operations15.xFactorial, 70, 9.999999999e+99);
    await expect(m.getFlag(9), true);
    m.setFlag(9, false);
    await _testOneArgFloat(m, Operations15.xFactorial, 70.1, 9.999999999e+99);
    await expect(m.getFlag(9), true);
    m.setFlag(9, false);

    await _testTwoArgFloat(m, Operations15.pYX, 1, 0, null, err: 0);
    await _testTwoArgFloat(m, Operations15.pYX, 0, 1, 1);
    await _testTwoArgFloat(m, Operations15.pYX, 0, 1.1, null, err: 0);
    await _testTwoArgFloat(m, Operations15.pYX, 0, 5, 1);
    await _testTwoArgFloat(m, Operations15.pYX, 1, 5, 5);
    await _testTwoArgFloat(m, Operations15.pYX, 2, 5, 20);
    await _testTwoArgFloat(m, Operations15.pYX, 3, 5, 60);
    await _testTwoArgFloat(m, Operations15.pYX, 4, 5, 120);
    await _testTwoArgFloat(m, Operations15.pYX, 5, 5, 120);
    await expect(m.getFlag(9), false);
    await _testTwoArgFloat(m, Operations15.pYX, 341, 357, 9.999999999e+99);
    await expect(m.getFlag(9), true);
    m.setFlag(9, false);
    await _testTwoArgFloat(m, Operations15.pYX, 7, 101, 8.668605053e13);
    await _testTwoArgFloat(m, Operations15.pYX, 15, 111, 1.777747078e30);
    await _testTwoArgFloat(m, Operations15.pYX, 21, 213, 2.840246967e48);
    await expect(m.getFlag(9), false);

    await _testTwoArgFloat(m, Operations15.cYX, 1, 0, null, err: 0);
    await _testTwoArgFloat(m, Operations15.cYX, 0, 1, 1);
    await _testTwoArgFloat(m, Operations15.cYX, 0, 1.1, null, err: 0);
    await _testTwoArgFloat(m, Operations15.cYX, 0, 5, 1);
    await _testTwoArgFloat(m, Operations15.cYX, 1, 5, 5);
    await _testTwoArgFloat(m, Operations15.cYX, 2, 5, 10);
    await _testTwoArgFloat(m, Operations15.cYX, 3, 5, 10);
    await _testTwoArgFloat(m, Operations15.cYX, 4, 5, 5);
    await _testTwoArgFloat(m, Operations15.cYX, 5, 5, 1);
    await _testTwoArgFloat(m, Operations15.cYX, 341, 357, 2.365542599e27);
    await expect(m.getFlag(9), false);
    await _testTwoArgFloat(m, Operations15.cYX, 3410, 3570, 9.999999999e99);
    await expect(m.getFlag(9), true);
    m.setFlag(9, false);
    await _testTwoArgFloat(
        m, Operations15.cYX, 10097, 10101, 433499141500425);
    // That's 10 places of accuracy, much more accurate than real 15C
    await expect(m.getFlag(9), false);
    await _testTwoArgFloat(m, Operations15.cYX, 10007, 10101, 9.999999999e99);
    await expect(m.getFlag(9), true);
    m.setFlag(9, false);
  });
}