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Added new samples

This commit is contained in:
Juan Moreno 2018-12-08 16:21:30 -03:00
parent f06a9f4106
commit be16616bb8
2 changed files with 69 additions and 25 deletions
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java-streams/.attach_pid12113 Normal file
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94
java-streams/src/test/java/com/baeldung/stream/filter/StreamFilterUnitTest.java
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@ -8,56 +8,93 @@ import java.io.IOException;
import java.util.Arrays; import java.util.Arrays;
import java.util.List; import java.util.List;
import java.util.Optional; import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.Stream; import java.util.stream.Stream;
import static org.assertj.core.api.AssertionsForClassTypes.assertThat; import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy; import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
public class StreamFilterUnitTest { public class StreamFilterUnitTest {
@Test @Test
public void givenListOfCustomers_whenFilterByLambda_thenGetTwo() { public void givenListOfCustomers_whenFilterByPoints_thenGetTwo() {
List<Customer> customers = Arrays.asList(new Customer("John P.", 15), new Customer("Sarah M.", 200), new Customer("Charles B.", 150), new Customer("Mary T.", 1)); Customer john = new Customer("John P.", 15);
Customer sarah = new Customer("Sarah M.", 200);
Customer charles = new Customer("Charles B.", 150);
Customer mary = new Customer("Mary T.", 1);
List<Customer> customers = Arrays.asList(john, sarah, charles, mary);
long customersWithMoreThan100Points = customers List<Customer> customersWithMoreThan100Points = customers
.stream() .stream()
.filter(c -> c.getPoints() > 100) .filter(c -> c.getPoints() > 100)
.count(); .collect(Collectors.toList());
assertThat(customersWithMoreThan100Points).isEqualTo(2); assertThat(customersWithMoreThan100Points).hasSize(2);
assertThat(customersWithMoreThan100Points).contains(sarah, charles);
}
@Test
public void givenListOfCustomers_whenFilterByPointsAndName_thenGetOne() {
Customer john = new Customer("John P.", 15);
Customer sarah = new Customer("Sarah M.", 200);
Customer charles = new Customer("Charles B.", 150);
Customer mary = new Customer("Mary T.", 1);
List<Customer> customers = Arrays.asList(john, sarah, charles, mary);
List<Customer> charlesWithMoreThan100Points = customers
.stream()
.filter(c -> c.getPoints() > 100 && c
.getName()
.startsWith("Charles"))
.collect(Collectors.toList());
assertThat(charlesWithMoreThan100Points).hasSize(1);
assertThat(charlesWithMoreThan100Points).contains(charles);
} }
@Test @Test
public void givenListOfCustomers_whenFilterByMethodReference_thenGetTwo() { public void givenListOfCustomers_whenFilterByMethodReference_thenGetTwo() {
List<Customer> customers = Arrays.asList(new Customer("John P.", 15), new Customer("Sarah M.", 200), new Customer("Charles B.", 150), new Customer("Mary T.", 1)); Customer john = new Customer("John P.", 15);
Customer sarah = new Customer("Sarah M.", 200);
Customer charles = new Customer("Charles B.", 150);
Customer mary = new Customer("Mary T.", 1);
List<Customer> customers = Arrays.asList(john, sarah, charles, mary);
long customersWithMoreThan100Points = customers List<Customer> customersWithMoreThan100Points = customers
.stream() .stream()
.filter(Customer::hasOverThousandPoints) .filter(Customer::hasOverThousandPoints)
.count(); .collect(Collectors.toList());
assertThat(customersWithMoreThan100Points).isEqualTo(2); assertThat(customersWithMoreThan100Points).hasSize(2);
assertThat(customersWithMoreThan100Points).contains(sarah, charles);
} }
@Test @Test
public void givenListOfCustomersWithOptional_whenFilterBy100Points_thenGetTwo() { public void givenListOfCustomersWithOptional_whenFilterBy100Points_thenGetTwo() {
List<Optional<Customer>> customers = Arrays.asList(Optional.of(new Customer("John P.", 15)), Optional.of(new Customer("Sarah M.", 200)), Optional.empty(), Optional.of(new Customer("Mary T.", 300)), Optional.empty()); Optional<Customer> john = Optional.of(new Customer("John P.", 15));
Optional<Customer> sarah = Optional.of(new Customer("Sarah M.", 200));
Optional<Customer> mary = Optional.of(new Customer("Mary T.", 300));
List<Optional<Customer>> customers = Arrays.asList(john, sarah, Optional.empty(), mary, Optional.empty());
long customersWithMoreThan100Points = customers List<Customer> customersWithMoreThan100Points = customers
.stream() .stream()
.flatMap(c -> c .flatMap(c -> c
.map(Stream::of) .map(Stream::of)
.orElseGet(Stream::empty)) .orElseGet(Stream::empty))
.filter(Customer::hasOverThousandPoints) .filter(Customer::hasOverThousandPoints)
.count(); .collect(Collectors.toList());
assertThat(customersWithMoreThan100Points).isEqualTo(2); assertThat(customersWithMoreThan100Points).hasSize(2);
assertThat(customersWithMoreThan100Points).contains(sarah.get(), mary.get());
} }
@Test @Test
public void givenListOfCustomers_whenFilterWithCustomHandling_thenThrowException() { public void givenListOfCustomers_whenFilterWithCustomHandling_thenThrowException() {
List<Customer> customers = Arrays.asList(new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e"), new Customer("Sarah M.", 200), new Customer("Charles B.", 150), Customer john = new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e");
new Customer("Mary T.", 1, "https://images.unsplash.com/photo-1543297057-25167dfc180e")); Customer sarah = new Customer("Sarah M.", 200);
Customer charles = new Customer("Charles B.", 150);
Customer mary = new Customer("Mary T.", 1, "https://images.unsplash.com/photo-1543297057-25167dfc180e");
List<Customer> customers = Arrays.asList(john, sarah, charles, mary);
assertThatThrownBy(() -> customers assertThatThrownBy(() -> customers
.stream() .stream()
@ -67,21 +104,27 @@ public class StreamFilterUnitTest {
@Test @Test
public void givenListOfCustomers_whenFilterWithThrowingFunction_thenThrowException() { public void givenListOfCustomers_whenFilterWithThrowingFunction_thenThrowException() {
List<Customer> customers = Arrays.asList(new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e"), new Customer("Sarah M.", 200), new Customer("Charles B.", 150), Customer john = new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e");
new Customer("Mary T.", 1, "https://images.unsplash.com/photo-1543297057-25167dfc180e")); Customer sarah = new Customer("Sarah M.", 200);
Customer charles = new Customer("Charles B.", 150);
Customer mary = new Customer("Mary T.", 1, "https://images.unsplash.com/photo-1543297057-25167dfc180e");
List<Customer> customers = Arrays.asList(john, sarah, charles, mary);
assertThatThrownBy(() -> customers assertThatThrownBy(() -> customers
.stream() .stream()
.filter((ThrowingPredicate.unchecked(Customer::hasValidProfilePhoto))) .filter((ThrowingPredicate.unchecked(Customer::hasValidProfilePhoto)))
.count()).isInstanceOf(WrappedException.class); .collect(Collectors.toList())).isInstanceOf(WrappedException.class);
} }
@Test @Test
public void givenListOfCustomers_whenFilterWithTryCatch_thenGetTwo() { public void givenListOfCustomers_whenFilterWithTryCatch_thenGetTwo() {
List<Customer> customers = Arrays.asList(new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e"), new Customer("Sarah M.", 200), new Customer("Charles B.", 150), Customer john = new Customer("John P.", 15, "https://images.unsplash.com/photo-1543320485-d0d5a49c2b2e");
new Customer("Mary T.", 1, "https://images.unsplash.com/photo-1543297057-25167dfc180e")); Customer sarah = new Customer("Sarah M.", 200);
Customer charles = new Customer("Charles B.", 150);
Customer mary = new Customer("Mary T.", 1, "https://images.unsplash.com/photo-1543297057-25167dfc180e");
List<Customer> customers = Arrays.asList(john, sarah, charles, mary);
long customersWithValidProfilePhoto = customers List<Customer> customersWithValidProfilePhoto = customers
.stream() .stream()
.filter(c -> { .filter(c -> {
try { try {
@ -91,9 +134,10 @@ public class StreamFilterUnitTest {
} }
return false; return false;
}) })
.count(); .collect(Collectors.toList());
assertThat(customersWithValidProfilePhoto).isEqualTo(2); assertThat(customersWithValidProfilePhoto).hasSize(2);
assertThat(customersWithValidProfilePhoto).contains(john, mary);
} }
@Test @Test
@ -110,6 +154,6 @@ public class StreamFilterUnitTest {
throw new RuntimeException(e); throw new RuntimeException(e);
} }
}) })
.count()).isInstanceOf(RuntimeException.class); .collect(Collectors.toList())).isInstanceOf(RuntimeException.class);
} }
} }