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BAEL-3778: Add tests to verify if 2 is prime number or not (#8520)

This commit is contained in:
kwoyke 2020-01-15 06:38:32 +01:00 committed by Grzegorz Piwowarek
parent 7a23abe4ff
commit c4c51d0383
3 changed files with 10 additions and 6 deletions
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2
java-numbers-2/src/main/java/com/baeldung/algorithms/primechecker/BruteForcePrimeChecker.java
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@ -7,7 +7,7 @@ public class BruteForcePrimeChecker implements PrimeChecker<Integer> {
@Override @Override
public boolean isPrime(Integer number) { public boolean isPrime(Integer number) {
return number > 2 ? IntStream.range(2, number) return number > 1 ? IntStream.range(2, number)
.noneMatch(n -> (number % n == 0)) : false; .noneMatch(n -> (number % n == 0)) : false;
} }

2
java-numbers-2/src/main/java/com/baeldung/algorithms/primechecker/OptimisedPrimeChecker.java
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@ -6,7 +6,7 @@ public class OptimisedPrimeChecker implements PrimeChecker<Integer> {
@Override @Override
public boolean isPrime(Integer number) { public boolean isPrime(Integer number) {
return number > 2 ? IntStream.rangeClosed(2, (int) Math.sqrt(number)) return number > 1 ? IntStream.rangeClosed(2, (int) Math.sqrt(number))
.noneMatch(n -> (number % n == 0)) : false; .noneMatch(n -> (number % n == 0)) : false;
} }

12
java-numbers-2/src/test/java/com/baeldung/algorithms/primechecker/PrimeCheckerUnitTest.java
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@ -11,22 +11,24 @@ public class PrimeCheckerUnitTest {
@Test @Test
public void whenCheckIsPrime_thenTrue() { public void whenCheckIsPrime_thenTrue() {
assertTrue(primeChecker.isPrime(13l)); assertTrue(primeChecker.isPrime(2L));
assertTrue(primeChecker.isPrime(13L));
assertTrue(primeChecker.isPrime(1009L)); assertTrue(primeChecker.isPrime(1009L));
assertTrue(primeChecker.isPrime(74207281L)); assertTrue(primeChecker.isPrime(74207281L));
} }
@Test @Test
public void whenCheckIsPrime_thenFalse() { public void whenCheckIsPrime_thenFalse() {
assertTrue(!primeChecker.isPrime(50L)); assertFalse(primeChecker.isPrime(50L));
assertTrue(!primeChecker.isPrime(1001L)); assertFalse(primeChecker.isPrime(1001L));
assertTrue(!primeChecker.isPrime(74207282L)); assertFalse(primeChecker.isPrime(74207282L));
} }
private final BruteForcePrimeChecker bfPrimeChecker = new BruteForcePrimeChecker(); private final BruteForcePrimeChecker bfPrimeChecker = new BruteForcePrimeChecker();
@Test @Test
public void whenBFCheckIsPrime_thenTrue() { public void whenBFCheckIsPrime_thenTrue() {
assertTrue(bfPrimeChecker.isPrime(2));
assertTrue(bfPrimeChecker.isPrime(13)); assertTrue(bfPrimeChecker.isPrime(13));
assertTrue(bfPrimeChecker.isPrime(1009)); assertTrue(bfPrimeChecker.isPrime(1009));
} }
@ -41,6 +43,7 @@ public class PrimeCheckerUnitTest {
@Test @Test
public void whenOptCheckIsPrime_thenTrue() { public void whenOptCheckIsPrime_thenTrue() {
assertTrue(optimisedPrimeChecker.isPrime(2));
assertTrue(optimisedPrimeChecker.isPrime(13)); assertTrue(optimisedPrimeChecker.isPrime(13));
assertTrue(optimisedPrimeChecker.isPrime(1009)); assertTrue(optimisedPrimeChecker.isPrime(1009));
} }
@ -55,6 +58,7 @@ public class PrimeCheckerUnitTest {
@Test @Test
public void whenPrimesCheckIsPrime_thenTrue() { public void whenPrimesCheckIsPrime_thenTrue() {
assertTrue(primesPrimeChecker.isPrime(2));
assertTrue(primesPrimeChecker.isPrime(13)); assertTrue(primesPrimeChecker.isPrime(13));
assertTrue(primesPrimeChecker.isPrime(1009)); assertTrue(primesPrimeChecker.isPrime(1009));
} }