package p20190916;
import junit.framework.TestCase;
import java.util.TreeSet;
public class ArmstrongTest extends TestCase {
public void testKnownArmstrongNumbersBetween0and999() {
final TreeSet<Integer> armstrongNumbers = new TreeSet<>();
assertIsArmstrongNumber(armstrongNumbers, 0);
assertIsArmstrongNumber(armstrongNumbers, 1);
assertIsArmstrongNumber(armstrongNumbers, 153);
assertIsArmstrongNumber(armstrongNumbers, 370);
assertIsArmstrongNumber(armstrongNumbers, 371);
assertIsArmstrongNumber(armstrongNumbers, 407);
for (int otherNumber = 0; otherNumber <= 999; ++otherNumber) {
if (!armstrongNumbers.contains(otherNumber)) {
assertFalse(otherNumber + " should *NOT* be an Armstrong number", NumberFinder.isArmstrong(otherNumber));
}
}
}
private static void assertIsArmstrongNumber(TreeSet<Integer> armstrongNumbers, int armstrongNumber) {
assertTrue(armstrongNumber + " should be Armstrong number", NumberFinder.isArmstrong(armstrongNumber));
armstrongNumbers.add(armstrongNumber);
}
}
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