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Fixes #9547
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162 changes: 162 additions & 0 deletions
162
user/test/com/google/gwt/emultest/java10/util/stream/CollectorsTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| /* | ||
| * Copyright 2023 Google Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| * use this file except in compliance with the License. You may obtain a copy of | ||
| * the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations under | ||
| * the License. | ||
| */ | ||
| package com.google.gwt.emultest.java10.util.stream; | ||
|
|
||
| import static com.google.gwt.emultest.java8.util.stream.CollectorsTest.applyItems; | ||
| import static java.util.stream.Collectors.toUnmodifiableList; | ||
| import static java.util.stream.Collectors.toUnmodifiableMap; | ||
| import static java.util.stream.Collectors.toUnmodifiableSet; | ||
|
|
||
| import com.google.gwt.emultest.java.util.EmulTestBase; | ||
|
|
||
| import java.util.Collection; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.function.Function; | ||
| import java.util.stream.Stream; | ||
|
|
||
| /** | ||
| * Tests for java.util.stream.Collectors Java 10 API emulation. | ||
| */ | ||
| public class CollectorsTest extends EmulTestBase { | ||
| private static <T> boolean unmodifiableCollection(Collection<T> c, T existingSample, T newSample) { | ||
| try { | ||
| c.remove(existingSample); | ||
| return false; | ||
| } catch (UnsupportedOperationException ignore) { | ||
| // expected | ||
| } | ||
| try { | ||
| c.add(newSample); | ||
| return false; | ||
| } catch (UnsupportedOperationException ignore) { | ||
| // expected | ||
| } | ||
| Iterator<T> itr = c.iterator(); | ||
| itr.next(); | ||
| try { | ||
| itr.remove(); | ||
| return false; | ||
| } catch (UnsupportedOperationException e) { | ||
| // expected | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| public void testToUnmodifiableList() { | ||
| applyItems(List.of("a", "b"), toUnmodifiableList(), "a", "b", (expected, actual) -> { | ||
| if (!expected.equals(actual)) { | ||
| return false; | ||
| } | ||
|
|
||
| if (!unmodifiableCollection(actual, "a", "z")) { | ||
| return false; | ||
| } | ||
|
|
||
| return true; | ||
| }); | ||
|
|
||
| // verify nulls fail | ||
| try { | ||
| Stream.of("a").map(ignore -> null).collect(toUnmodifiableList()); | ||
| fail("Expected NPE"); | ||
| } catch (NullPointerException ignore) { | ||
| // expected | ||
| } | ||
| } | ||
|
|
||
| public void testToUnmodifiableMap() { | ||
| // verify simple cases copy all values and results are unmodifiable | ||
| applyItems(Map.of("a", 0, "b", 1), toUnmodifiableMap(Function.identity(), | ||
| k -> k.charAt(0) - 'a'), "a", "b", (expected, actual) -> { | ||
| if (!expected.equals(actual)) { | ||
| return false; | ||
| } | ||
|
|
||
| if (!unmodifiableMap(actual, "a", 0, "z", 100)) { | ||
| return false; | ||
| } | ||
|
|
||
| return true; | ||
| }); | ||
|
|
||
| // verify merge works with only one key (but this is just passing through to the toMap func | ||
| // anyway...) | ||
| applyItems(Map.of("a", 2), toUnmodifiableMap(Function.identity(), ignore -> 1, Integer::sum), | ||
| "a", "a"); | ||
|
|
||
| // verify nulls blow up for both keys and values | ||
| try { | ||
| Stream.of("a").collect(toUnmodifiableMap(obj -> null, Function.identity())); | ||
| fail("Expected NPE"); | ||
| } catch (NullPointerException ignore) { | ||
| // expected | ||
| } | ||
| try { | ||
| Stream.of("a").collect(toUnmodifiableMap(Function.identity(), obj -> null)); | ||
| fail("Expected NPE"); | ||
| } catch (Exception ignore) { | ||
| // expected | ||
| } | ||
| } | ||
|
|
||
| private <K, V> boolean unmodifiableMap(Map<K, V> a, K existingKey, V existingValue, K newKey, | ||
| V newValue) { | ||
| if (!unmodifiableCollection(a.keySet(), existingKey, newKey)) { | ||
| return false; | ||
| } | ||
| if (!unmodifiableCollection(a.values(), existingValue, newValue)) { | ||
| return false; | ||
| } | ||
|
|
||
| try { | ||
| a.put(newKey, newValue); | ||
| return false; | ||
| } catch (Exception ignore) { | ||
| // expected | ||
| } | ||
| try { | ||
| a.remove(existingKey); | ||
| return false; | ||
| } catch (Exception ignore) { | ||
| // expected | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| public void testToUnmodifiableSet() { | ||
| applyItems(Set.of("a", "b"), toUnmodifiableSet(), "a", "b", (expected, actual) -> { | ||
| if (!expected.equals(actual)) { | ||
| return false; | ||
| } | ||
| if (!unmodifiableCollection(actual, "a", "z")) { | ||
| return false; | ||
| } | ||
| return true; | ||
| }); | ||
|
|
||
| // verify nulls fail | ||
| try { | ||
| Stream.of("a").map(ignore -> null).collect(toUnmodifiableSet()); | ||
| fail("Expected NPE"); | ||
| } catch (NullPointerException ignore) { | ||
| // expected | ||
| } | ||
| } | ||
| } |