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test/jdk/java/util/Optional/Basic.java
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rev 49492 : 8195649: reorganize tests for java.util.Optional
Reviewed-by: XXX
@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -20,352 +20,184 @@
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
+ * @bug 8195649
* @summary Basic functional test of Optional
* @author Mike Duigou
+ * @build ObscureException
* @run testng Basic
*/
-import java.lang.AssertionError;
-import java.lang.NullPointerException;
-import java.lang.Throwable;
+import java.util.List;
import java.util.NoSuchElementException;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.stream.Stream;
+
+import static java.util.stream.Collectors.toList;
import static org.testng.Assert.*;
import org.testng.annotations.Test;
-
public class Basic {
- @Test(groups = "unit")
- public void testEmpty() {
- Optional<Boolean> empty = Optional.empty();
- Optional<String> presentEmptyString = Optional.of("");
- Optional<Boolean> present = Optional.of(Boolean.TRUE);
-
- // empty
- assertTrue(empty.equals(empty));
+ /**
+ * Checks a block of assertions over an empty Optional.
+ */
+ void checkEmpty(Optional<String> empty) {
assertTrue(empty.equals(Optional.empty()));
- assertTrue(!empty.equals(present));
- assertTrue(0 == empty.hashCode());
- assertTrue(!empty.toString().isEmpty());
- assertTrue(!empty.toString().equals(presentEmptyString.toString()));
- assertTrue(!empty.isPresent());
-
- empty.ifPresent(v -> fail());
-
- AtomicBoolean emptyCheck = new AtomicBoolean();
- empty.ifPresentOrElse(v -> fail(), () -> emptyCheck.set(true));
- assertTrue(emptyCheck.get());
-
- try {
- empty.ifPresentOrElse(v -> fail(), () -> { throw new ObscureException(); });
- fail();
- } catch (ObscureException expected) {
- } catch (AssertionError e) {
- throw e;
- } catch (Throwable t) {
- fail();
- }
+ assertTrue(Optional.empty().equals(empty));
+ assertFalse(empty.equals(Optional.of("unexpected")));
+ assertFalse(Optional.of("unexpected").equals(empty));
+ assertFalse(empty.equals("unexpected"));
+
+ assertFalse(empty.isPresent());
+ assertEquals(empty.hashCode(), 0);
+ assertEquals(empty.orElse("x"), "x");
+ assertEquals(empty.orElseGet(() -> "y"), "y");
+
+ assertThrows(NoSuchElementException.class, () -> empty.get());
+ assertThrows(NoSuchElementException.class, () -> empty.orElseThrow());
+ assertThrows(ObscureException.class, () -> empty.orElseThrow(ObscureException::new));
+
+ var b = new AtomicBoolean();
+ empty.ifPresent(s -> b.set(true));
+ assertFalse(b.get());
+
+ var b1 = new AtomicBoolean(false);
+ var b2 = new AtomicBoolean(false);
+ empty.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
+ assertFalse(b1.get());
+ assertTrue(b2.get());
+
+ assertEquals(empty.toString(), "Optional.empty");
+ }
+
+ /**
+ * Checks a block of assertions over an Optional that is expected to
+ * have a particular value present.
+ */
+ void checkPresent(Optional<String> opt, String expected) {
+ assertFalse(opt.equals(Optional.empty()));
+ assertFalse(Optional.empty().equals(opt));
+ assertTrue(opt.equals(Optional.of(expected)));
+ assertTrue(Optional.of(expected).equals(opt));
+ assertFalse(opt.equals(Optional.of("unexpected")));
+ assertFalse(Optional.of("unexpected").equals(opt));
+ assertFalse(opt.equals("unexpected"));
+
+ assertTrue(opt.isPresent());
+ assertEquals(opt.hashCode(), expected.hashCode());
+ assertEquals(opt.orElse("unexpected"), expected);
+ assertEquals(opt.orElseGet(() -> "unexpected"), expected);
+
+ assertEquals(opt.get(), expected);
+ assertEquals(opt.orElseThrow(), expected);
+ assertEquals(opt.orElseThrow(ObscureException::new), expected);
+
+ var b = new AtomicBoolean(false);
+ opt.ifPresent(s -> b.set(true));
+ assertTrue(b.get());
+
+ var b1 = new AtomicBoolean(false);
+ var b2 = new AtomicBoolean(false);
+ opt.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
+ assertTrue(b1.get());
+ assertFalse(b2.get());
- assertSame(null, empty.orElse(null));
- RuntimeException orElse = new RuntimeException() { };
- assertSame(Boolean.FALSE, empty.orElse(Boolean.FALSE));
- assertSame(null, empty.orElseGet(() -> null));
- assertSame(Boolean.FALSE, empty.orElseGet(() -> Boolean.FALSE));
+ assertEquals(opt.toString(), "Optional[" + expected + "]");
}
@Test(groups = "unit")
- public void testIfPresentAndOrElseAndNull() {
- Optional<Boolean> empty = Optional.empty();
- Optional<Boolean> present = Optional.of(Boolean.TRUE);
-
- // No NPE
- present.ifPresentOrElse(v -> {}, null);
- empty.ifPresent(null);
- empty.ifPresentOrElse(null, () -> {});
-
- // NPE
- try {
- present.ifPresent(null);
- fail();
- } catch (NullPointerException ex) {}
- try {
- present.ifPresentOrElse(null, () -> {});
- fail();
- } catch (NullPointerException ex) {}
- try {
- empty.ifPresentOrElse(v -> {}, null);
- fail();
- } catch (NullPointerException ex) {}
- }
-
- @Test(expectedExceptions=NoSuchElementException.class)
- public void testEmptyGet() {
- Optional<Boolean> empty = Optional.empty();
-
- Boolean got = empty.get();
- }
-
- @Test(expectedExceptions=NullPointerException.class)
- public void testEmptyOrElseGetNull() {
- Optional<Boolean> empty = Optional.empty();
-
- Boolean got = empty.orElseGet(null);
- }
-
- @Test(expectedExceptions=NullPointerException.class)
- public void testEmptyOrElseThrowNull() throws Throwable {
- Optional<Boolean> empty = Optional.empty();
-
- Boolean got = empty.orElseThrow(null);
- }
-
- @Test(expectedExceptions=ObscureException.class)
- public void testEmptyOrElseThrow() throws Exception {
- Optional<Boolean> empty = Optional.empty();
-
- Boolean got = empty.orElseThrow(ObscureException::new);
- }
-
- @Test(expectedExceptions=NoSuchElementException.class)
- public void testEmptyOrElseThrowNoArg() throws Exception {
- Optional<Boolean> empty = Optional.empty();
-
- Boolean got = empty.orElseThrow();
+ public void testEmpty() {
+ checkEmpty(Optional.empty());
}
@Test(groups = "unit")
- public void testPresent() {
- Optional<Boolean> empty = Optional.empty();
- Optional<String> presentEmptyString = Optional.of("");
- Optional<Boolean> present = Optional.of(Boolean.TRUE);
-
- // present
- assertTrue(present.equals(present));
- assertTrue(present.equals(Optional.of(Boolean.TRUE)));
- assertTrue(!present.equals(empty));
- assertTrue(Boolean.TRUE.hashCode() == present.hashCode());
- assertTrue(!present.toString().isEmpty());
- assertTrue(!present.toString().equals(presentEmptyString.toString()));
- assertTrue(-1 != present.toString().indexOf(Boolean.TRUE.toString()));
- assertSame(Boolean.TRUE, present.get());
- assertSame(Boolean.TRUE, present.orElseThrow());
-
- AtomicBoolean presentCheck = new AtomicBoolean();
- present.ifPresent(v -> presentCheck.set(true));
- assertTrue(presentCheck.get());
- presentCheck.set(false);
- present.ifPresentOrElse(v -> presentCheck.set(true), () -> fail());
- assertTrue(presentCheck.get());
-
- try {
- present.ifPresent(v -> { throw new ObscureException(); });
- fail();
- } catch (ObscureException expected) {
- } catch (AssertionError e) {
- throw e;
- } catch (Throwable t) {
- fail();
- }
- try {
- present.ifPresentOrElse(v -> { throw new ObscureException(); }, () -> fail());
- fail();
- } catch (ObscureException expected) {
- } catch (AssertionError e) {
- throw e;
- } catch (Throwable t) {
- fail();
- }
-
- assertSame(Boolean.TRUE, present.orElse(null));
- assertSame(Boolean.TRUE, present.orElse(Boolean.FALSE));
- assertSame(Boolean.TRUE, present.orElseGet(null));
- assertSame(Boolean.TRUE, present.orElseGet(() -> null));
- assertSame(Boolean.TRUE, present.orElseGet(() -> Boolean.FALSE));
- assertSame(Boolean.TRUE, present.<RuntimeException>orElseThrow(null));
- assertSame(Boolean.TRUE, present.<RuntimeException>orElseThrow(ObscureException::new));
+ public void testOfNull() {
+ assertThrows(NullPointerException.class, () -> Optional.of(null));
}
@Test(groups = "unit")
- public void testOfNullable() {
- Optional<String> instance = Optional.ofNullable(null);
- assertFalse(instance.isPresent());
-
- instance = Optional.ofNullable("Duke");
- assertTrue(instance.isPresent());
- assertEquals(instance.get(), "Duke");
- assertEquals(instance.orElseThrow(), "Duke");
+ public void testOfPresent() {
+ checkPresent(Optional.of("xyzzy"), "xyzzy");
}
@Test(groups = "unit")
- public void testFilter() {
- // Null mapper function
- Optional<String> empty = Optional.empty();
- Optional<String> duke = Optional.of("Duke");
-
- try {
- Optional<String> result = empty.filter(null);
- fail("Should throw NPE on null mapping function");
- } catch (NullPointerException npe) {
- // expected
+ public void testOfNullableNull() {
+ checkEmpty(Optional.ofNullable(null));
}
- Optional<String> result = empty.filter(String::isEmpty);
- assertFalse(result.isPresent());
-
- result = duke.filter(String::isEmpty);
- assertFalse(result.isPresent());
- result = duke.filter(s -> s.startsWith("D"));
- assertTrue(result.isPresent());
- assertEquals(result.get(), "Duke");
- assertEquals(result.orElseThrow(), "Duke");
-
- Optional<String> emptyString = Optional.of("");
- result = emptyString.filter(String::isEmpty);
- assertTrue(result.isPresent());
- assertEquals(result.get(), "");
- assertEquals(result.orElseThrow(), "");
+ @Test(groups = "unit")
+ public void testOfNullablePresent() {
+ checkPresent(Optional.ofNullable("xyzzy"), "xyzzy");
}
@Test(groups = "unit")
- public void testMap() {
- Optional<String> empty = Optional.empty();
- Optional<String> duke = Optional.of("Duke");
-
- // Null mapper function
- try {
- Optional<Boolean> b = empty.map(null);
- fail("Should throw NPE on null mapping function");
- } catch (NullPointerException npe) {
- // expected
+ public void testFilterEmpty() {
+ checkEmpty(Optional.<String>empty().filter(s -> { fail(); return true; }));
}
- // Map an empty value
- Optional<Boolean> b = empty.map(String::isEmpty);
- assertFalse(b.isPresent());
-
- // Map into null
- b = empty.map(n -> null);
- assertFalse(b.isPresent());
- b = duke.map(s -> null);
- assertFalse(b.isPresent());
-
- // Map to value
- Optional<Integer> l = duke.map(String::length);
- assertEquals(l.get().intValue(), 4);
+ @Test(groups = "unit")
+ public void testFilterFalse() {
+ checkEmpty(Optional.of("xyzzy").filter(s -> s.equals("plugh")));
}
@Test(groups = "unit")
- public void testFlatMap() {
- Optional<String> empty = Optional.empty();
- Optional<String> duke = Optional.of("Duke");
-
- // Null mapper function
- try {
- Optional<Boolean> b = empty.flatMap(null);
- fail("Should throw NPE on null mapping function");
- } catch (NullPointerException npe) {
- // expected
+ public void testFilterTrue() {
+ checkPresent(Optional.of("xyzzy").filter(s -> s.equals("xyzzy")), "xyzzy");
}
- // Map into null
- try {
- Optional<Boolean> b = duke.flatMap(s -> null);
- fail("Should throw NPE when mapper return null");
- } catch (NullPointerException npe) {
- // expected
+ @Test(groups = "unit")
+ public void testMapEmpty() {
+ checkEmpty(Optional.empty().map(s -> { fail(); return ""; }));
}
- // Empty won't invoke mapper function
- try {
- Optional<Boolean> b = empty.flatMap(s -> null);
- assertFalse(b.isPresent());
- } catch (NullPointerException npe) {
- fail("Mapper function should not be invoked");
+ @Test(groups = "unit")
+ public void testMapPresent() {
+ checkPresent(Optional.of("xyzzy").map(s -> s.replace("xyzzy", "plugh")), "plugh");
}
- // Map an empty value
- Optional<Integer> l = empty.flatMap(s -> Optional.of(s.length()));
- assertFalse(l.isPresent());
-
- // Map to value
- Optional<Integer> fixture = Optional.of(Integer.MAX_VALUE);
- l = duke.flatMap(s -> Optional.of(s.length()));
- assertTrue(l.isPresent());
- assertEquals(l.get().intValue(), 4);
- assertEquals(l.orElseThrow().intValue(), 4);
-
- // Verify same instance
- l = duke.flatMap(s -> fixture);
- assertSame(l, fixture);
+ @Test(groups = "unit")
+ public void testFlatMapEmpty() {
+ checkEmpty(Optional.empty().flatMap(s -> { fail(); return Optional.of(""); }));
}
@Test(groups = "unit")
- public void testOr() {
- Optional<String> empty = Optional.empty();
- Optional<String> duke = Optional.of("Duke");
-
- // Null supplier
- try {
- Optional<String> b = empty.or(null);
- fail("Should throw NPE on null supplier");
- } catch (NullPointerException npe) {
- // expected
+ public void testFlatMapPresentReturnEmpty() {
+ checkEmpty(Optional.of("xyzzy")
+ .flatMap(s -> { assertEquals(s, "xyzzy"); return Optional.empty(); }));
}
- // Supply null
- try {
- Optional<String> b = empty.or(() -> null);
- fail("Should throw NPE when supplier returns null");
- } catch (NullPointerException npe) {
- // expected
+ @Test(groups = "unit")
+ public void testFlatMapPresentReturnPresent() {
+ checkPresent(Optional.of("xyzzy")
+ .flatMap(s -> { assertEquals(s, "xyzzy"); return Optional.of("plugh"); }),
+ "plugh");
}
- // Non-empty won't invoke supplier
- try {
- Optional<String> b = duke.or(() -> null);
- assertTrue(b.isPresent());
- } catch (NullPointerException npe) {
- fail("Supplier should not be invoked");
+ @Test(groups = "unit")
+ public void testOrEmptyEmpty() {
+ checkEmpty(Optional.<String>empty().or(() -> Optional.empty()));
}
- // Supply for empty
- Optional<String> suppliedDuke = empty.or(() -> duke);
- assertTrue(suppliedDuke.isPresent());
- assertSame(suppliedDuke, duke);
-
- // Supply for non-empty
- Optional<String> actualDuke = duke.or(() -> Optional.of("Other Duke"));
- assertTrue(actualDuke.isPresent());
- assertSame(actualDuke, duke);
+ @Test(groups = "unit")
+ public void testOrEmptyPresent() {
+ checkPresent(Optional.<String>empty().or(() -> Optional.of("plugh")), "plugh");
}
@Test(groups = "unit")
- public void testStream() {
- {
- Stream<String> s = Optional.<String>empty().stream();
- assertFalse(s.isParallel());
-
- Object[] es = s.toArray();
- assertEquals(es.length, 0);
+ public void testOrPresentDontCare() {
+ checkPresent(Optional.of("xyzzy").or(() -> { fail(); return Optional.of("plugh"); }), "xyzzy");
}
- {
- Stream<String> s = Optional.of("Duke").stream();
- assertFalse(s.isParallel());
-
- String[] es = s.toArray(String[]::new);
- assertEquals(es.length, 1);
- assertEquals(es[0], "Duke");
- }
+ @Test(groups = "unit")
+ public void testStreamEmpty() {
+ assertEquals(Optional.empty().stream().collect(toList()), List.of());
}
- private static class ObscureException extends RuntimeException {
-
+ @Test(groups = "unit")
+ public void testStreamPresent() {
+ assertEquals(Optional.of("xyzzy").stream().collect(toList()), List.of("xyzzy"));
}
}
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