/** test the hash code algorithm */
public void testHashCode() {
Almost a = new Almost(0.001, 0.000001);
assert (a.hashCodeOf(0.00000001, 100) == 0);
assert (a.hashCodeOf(0.99999999, 100) == 1);
assert (a.hashCodeOf(1.00000001, 100) == 1);
assert (a.hashCodeOf(123456789L, 100) == 123456789L);
assert (a.hashCodeOf(3.1415, 4) == a.hashCodeOf(3.1415926, 4));
assert (a.hashCodeOf(3.1415, 5) != a.hashCodeOf(3.1415926, 5));
assert (a.hashCodeOf(-3.1415, 4) == a.hashCodeOf(-3.1415926, 4));
assert (a.hashCodeOf(-3.1415, 5) != a.hashCodeOf(-3.1415926, 5));
assert (a.hashCodeOf(314.15, 4) == a.hashCodeOf(314.15926, 4));
assert (a.hashCodeOf(314.15, 5) != a.hashCodeOf(314.15926, 5));
assert (a.hashCodeOf(-314.15, 4) == a.hashCodeOf(-314.15926, 4));
assert (a.hashCodeOf(-314.15, 5) != a.hashCodeOf(-314.15926, 5));
assert (a.hashCodeOf(0.0031415, 4) == a.hashCodeOf(0.0031415926, 4));
assert (a.hashCodeOf(0.0031415, 5) != a.hashCodeOf(0.0031415926, 5));
// specify precision differently
a = new Almost(0.0001);
assert (a.equal(0.0031415, 0.0031415926));
assert (a.hashCodeOf(0.0031415) == a.hashCodeOf(0.0031415926));
a = new Almost(0.00001);
assert (!a.equal(0.0031415, 0.0031415926));
assert (a.hashCodeOf(0.0031415) != a.hashCodeOf(0.0031415926));
a = new Almost(4);
assert (a.equal(0.0031415, 0.0031415926));
assert (a.hashCodeOf(0.0031415) == a.hashCodeOf(0.0031415926));
a = new Almost(5);
assert (!a.equal(0.0031415, 0.0031415926));
assert (a.hashCodeOf(0.0031415) != a.hashCodeOf(0.0031415926));
}
