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unsafeInstanceOf Quality, closes #155
This provides a Quality similar to `istanceOf` but also taking `Quality`s of subclasses of the given class. This is unsafe because there is no guarantee that the testee is actually of that subtype, but it may be required if the testee is a generic class.
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75 changes: 75 additions & 0 deletions
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...idence-core/src/main/java/org/saynotobugs/confidence/quality/object/UnsafeInstanceOf.java
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| /* | ||
| * Copyright 2022 dmfs GmbH | ||
| * | ||
| * | ||
| * 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. | ||
| * | ||
| */ | ||
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| package org.saynotobugs.confidence.quality.object; | ||
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| import org.dmfs.srcless.annotations.staticfactory.StaticFactories; | ||
| import org.saynotobugs.confidence.Quality; | ||
| import org.saynotobugs.confidence.quality.composite.AllOfFailingFast; | ||
| import org.saynotobugs.confidence.quality.composite.QualityComposition; | ||
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| import static org.saynotobugs.confidence.description.LiteralDescription.NEW_LINE; | ||
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| @StaticFactories(value = "Core", packageName = "org.saynotobugs.confidence.quality") | ||
| public final class UnsafeInstanceOf<T> extends QualityComposition<T> | ||
| { | ||
| /** | ||
| * A {@link Quality} that matches when the object under test is an instance of any subclass of the given class and | ||
| * satisfies the given {@link Quality}. | ||
| * <p> | ||
| * This works like {@link InstanceOf} but provides fewer type-safety guarantees allowing you to pass | ||
| * {@link Quality} of subtypes of {@code V}. This may be required when testing generic classes, because you'll | ||
| * essentially be forced to work with raw types in such case. | ||
| * | ||
| * <h4>Example</h4> | ||
| * <pre>{@code | ||
| * Map actual = ...; | ||
| * | ||
| * assertThat(actual, unsafeInstanceOf(Map.class, Core.<Map<String, Object>>allOf( | ||
| * containsEntry("k1", unsafeInstanceOf(Map.class, allOf( | ||
| * containsEntry("k11", "v11"), | ||
| * containsEntry("k12", "v12")))), | ||
| * containsEntry("k2", unsafeInstanceOf(Iterable.class, iterates("v21", "v22"))), | ||
| * containsEntry("k3", unsafeInstanceOf(String.class, equalTo("v3")))))); | ||
| * }</pre> | ||
| * <p> | ||
| * <p> | ||
| * Be aware that this also allows you to write nonsensical tests like this: | ||
| * <pre>{@code | ||
| * static class C1 {} | ||
| * | ||
| * static class C2 extends C1 { | ||
| * int bar() {return 2;} | ||
| * } | ||
| * | ||
| * @Test | ||
| * void instanceOfTest() { | ||
| * Object o = new C1(); | ||
| * assertThat(o, unsafeInstanceOf(C1.class, has(C2::bar, equalTo(2)))); | ||
| * } | ||
| * }</pre> | ||
| * <p> | ||
| * In such case, when the Quality is not compatible with the actual type, the test will fail, reporting a | ||
| * {@link ClassCastException}. | ||
| */ | ||
| public <V extends T, Q extends V> UnsafeInstanceOf(Class<V> expectation, Quality<? super Q> delegate) | ||
| { | ||
| super((Quality<T>) new AllOfFailingFast<>(NEW_LINE, new InstanceOf<>(expectation), delegate)); | ||
| } | ||
| } |
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...ce-core/src/test/java/org/saynotobugs/confidence/quality/object/UnsafeInstanceOfTest.java
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| /* | ||
| * Copyright 2023 dmfs GmbH | ||
| * | ||
| * | ||
| * 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. | ||
| * | ||
| */ | ||
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| package org.saynotobugs.confidence.quality.object; | ||
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| import org.dmfs.jems2.iterable.Seq; | ||
| import org.junit.jupiter.api.Test; | ||
| import org.saynotobugs.confidence.quality.composite.AllOf; | ||
| import org.saynotobugs.confidence.quality.composite.Has; | ||
| import org.saynotobugs.confidence.quality.grammar.That; | ||
| import org.saynotobugs.confidence.quality.iterable.Iterates; | ||
| import org.saynotobugs.confidence.test.quality.Fails; | ||
| import org.saynotobugs.confidence.test.quality.HasDescription; | ||
| import org.saynotobugs.confidence.test.quality.Passes; | ||
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| import static org.saynotobugs.confidence.Assertion.assertThat; | ||
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| class UnsafeInstanceOfTest | ||
| { | ||
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| @Test | ||
| void testDelegate() | ||
| { | ||
| assertThat(new UnsafeInstanceOf<>(Number.class, new That<>(new Has<>("intValue", Number::intValue, new EqualTo<>(1)))), | ||
| new AllOf<>( | ||
| new Passes<>(1, 1.001, 1L, 1f), | ||
| new Fails<>(0.999, "(1) that had intValue <0>"), | ||
| new Fails<>(2, "(1) that had intValue <2>"), | ||
| new Fails<>("string", "(0) instance of <class java.lang.String>"), | ||
| new Fails<>(new Object(), "(0) instance of <class java.lang.Object>"), | ||
| new HasDescription("(0) instance of <class java.lang.Number>\n (1) that has intValue <1>") | ||
| )); | ||
| } | ||
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| @Test | ||
| void testSubClassDelegate() | ||
| { | ||
| assertThat(new UnsafeInstanceOf<>(Iterable.class, new That<>(new Iterates<>(1, "abc", true))), | ||
| new AllOf<>( | ||
| new Passes<>(new Seq<Object>(1, "abc", true), new Seq(1, "abc", true)), | ||
| new Fails<>(new Seq<Object>(1.1, "abc", true), "(1) that iterated [ 0: <1.1>\n ... ]"), | ||
| new Fails<>(2, "(0) instance of <class java.lang.Integer>"), | ||
| new Fails<>("string", "(0) instance of <class java.lang.String>"), | ||
| new Fails<>(new Object(), "(0) instance of <class java.lang.Object>"), | ||
| new HasDescription("(0) instance of <interface java.lang.Iterable>\n (1) that iterates [ 0: <1>,\n 1: \"abc\",\n 2: <true> ]") | ||
| )); | ||
| } | ||
| } |