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EntityIdStaticFactoryMethodResolverTest.java
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EntityIdStaticFactoryMethodResolverTest.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.base.model.entity.id;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatNullPointerException;
import static org.mutabilitydetector.unittesting.MutabilityAssert.assertInstancesOf;
import static org.mutabilitydetector.unittesting.MutabilityMatchers.areImmutable;
import java.lang.reflect.Method;
import java.util.Optional;
import org.eclipse.ditto.base.model.entity.type.EntityType;
import org.junit.Test;
/**
* Unit test for {@link EntityIdStaticFactoryMethodResolver}.
*/
public final class EntityIdStaticFactoryMethodResolverTest {
@Test
public void assertImmutability() {
assertInstancesOf(EntityIdStaticFactoryMethodResolver.class, areImmutable());
}
@Test
public void getStaticFactoryMethodForNullClassFails() {
assertThatNullPointerException()
.isThrownBy(() -> EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(null))
.withMessage("The entityIdClass must not be null!")
.withNoCause();
}
@Test
public void getStaticFactoryMethodForAppropriateEntityIdClassReturnsExpectedMethod() throws NoSuchMethodException {
final Class<EntityIdForTests> entityIdClass = EntityIdForTests.class;
final Method expectedStaticFactoryMethod = entityIdClass.getDeclaredMethod("of", CharSequence.class);
final Optional<Method> staticFactoryMethod =
EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(entityIdClass);
assertThat(staticFactoryMethod).hasValue(expectedStaticFactoryMethod);
}
@Test
public void getStaticFactoryMethodForClassWithFactoryMethodThatReturnsSupertypeReturnsExpectedMethod()
throws NoSuchMethodException {
final Class<StaticFactoryMethodReturnsSuperclass> entityIdClass = StaticFactoryMethodReturnsSuperclass.class;
final Method expectedStaticFactoryMethod = entityIdClass.getDeclaredMethod("of", CharSequence.class);
final Optional<Method> staticFactoryMethod =
EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(entityIdClass);
assertThat(staticFactoryMethod).hasValue(expectedStaticFactoryMethod);
}
@Test
public void getStaticFactoryMethodForClassWithoutMethodsReturnsEmptyOptional() {
final class ClassWithoutDeclaredMethods extends AbstractEntityId {
private ClassWithoutDeclaredMethods(final EntityType entityType, final CharSequence id) {
super(entityType, id);
}
}
final Optional<Method> staticFactoryMethod =
EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(ClassWithoutDeclaredMethods.class);
assertThat(staticFactoryMethod).isEmpty();
}
@Test
public void getStaticFactoryMethodForClassWithoutMethodsReturningTheDeclaredClassReturnsEmptyOptional() {
final Optional<Method> staticFactoryMethod =
EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(StaticFactoryMethodReturnsString.class);
assertThat(staticFactoryMethod).isEmpty();
}
@Test
public void getStaticFactoryMethodForClassWithStaticFactoryMethodWithSoleIntParameterReturnsEmptyOptional() {
final Optional<Method> staticFactoryMethod =
EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(StaticFactoryMethodHasSoleIntParameter.class);
assertThat(staticFactoryMethod).isEmpty();
}
@Test
public void getStaticFactoryMethodForClassWithStaticFactoryMethodWithTwoParametersReturnsEmptyOptional() {
final Optional<Method> staticFactoryMethod =
EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(StaticFactoryMethodHasTwoParameters.class);
assertThat(staticFactoryMethod).isEmpty();
}
@Test
public void getStaticFactoryMethodForClassWithNonPublicStaticFactoryMethodReturnsEmptyOptional() {
final Optional<Method> staticFactoryMethod =
EntityIdStaticFactoryMethodResolver.getStaticFactoryMethod(StaticFactoryMethodIsNotPublic.class);
assertThat(staticFactoryMethod).isEmpty();
}
private static final class StaticFactoryMethodReturnsSuperclass extends AbstractEntityId {
private StaticFactoryMethodReturnsSuperclass(final EntityType entityType, final CharSequence id) {
super(entityType, id);
}
public static AbstractEntityId of(final CharSequence id) {
return new StaticFactoryMethodReturnsSuperclass(EntityType.of(id), id);
}
}
private static final class StaticFactoryMethodReturnsString extends AbstractEntityId {
private StaticFactoryMethodReturnsString(final EntityType entityType, final CharSequence id) {
super(entityType, id);
}
public static String of(final CharSequence id) {
return StaticFactoryMethodReturnsString.class.getSimpleName();
}
}
private static final class StaticFactoryMethodHasSoleIntParameter extends AbstractEntityId {
private StaticFactoryMethodHasSoleIntParameter(final EntityType entityType, final CharSequence id) {
super(entityType, id);
}
public static StaticFactoryMethodHasSoleIntParameter of(final int id) {
final String idAsString = String.valueOf(id);
return new StaticFactoryMethodHasSoleIntParameter(EntityType.of(idAsString), idAsString);
}
}
private static final class StaticFactoryMethodHasTwoParameters extends AbstractEntityId {
private StaticFactoryMethodHasTwoParameters(final EntityType entityType, final CharSequence id) {
super(entityType, id);
}
public static StaticFactoryMethodHasTwoParameters of(final CharSequence id, final boolean isGrault) {
return new StaticFactoryMethodHasTwoParameters(EntityType.of(id + String.valueOf(isGrault)), id);
}
}
private static final class StaticFactoryMethodIsNotPublic extends AbstractEntityId {
private StaticFactoryMethodIsNotPublic(final EntityType entityType, final CharSequence id) {
super(entityType, id);
}
static StaticFactoryMethodIsNotPublic of(final CharSequence id) {
return new StaticFactoryMethodIsNotPublic(EntityType.of(id), id);
}
}
}