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DefaultPersistenceProviderResolverTest.java
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DefaultPersistenceProviderResolverTest.java
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/**
* Copyright (C) 2022 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.model;
import cz.cvut.kbss.jopa.environment.TestPersistenceProvider;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.List;
import java.util.Optional;
import static org.junit.jupiter.api.Assertions.*;
class DefaultPersistenceProviderResolverTest {
private final DefaultPersistenceProviderResolver resolver = new DefaultPersistenceProviderResolver();
@AfterEach
void tearDown() throws Exception {
generateProviderFileContent(TestPersistenceProvider.class.getName()); // Clear the file content
}
@Test
void getPersistenceProviderCachesProviderInstances() {
final List<PersistenceProvider> providersOne = resolver.getPersistenceProviders();
final List<PersistenceProvider> providersTwo = resolver.getPersistenceProviders();
assertEquals(providersOne.size(), providersTwo.size());
for (int i = 0; i < providersOne.size(); i++) {
assertSame(providersOne.get(i), providersTwo.get(i));
}
}
@Test
void clearCachedProvidersEvictsProviderCache() {
final List<PersistenceProvider> providersOne = resolver.getPersistenceProviders();
resolver.clearCachedProviders();
final List<PersistenceProvider> providersTwo = resolver.getPersistenceProviders();
assertEquals(providersOne.size(), providersTwo.size());
for (int i = 0; i < providersOne.size(); i++) {
assertNotSame(providersOne.get(i), providersTwo.get(i));
}
}
@Test
void getProvidersReturnsProvidersFoundOnClasspathViaMetaInfConfiguration() {
final List<PersistenceProvider> result = resolver.getPersistenceProviders();
assertFalse(result.isEmpty());
final Optional<PersistenceProvider> pp = result.stream().filter(p -> p instanceof TestPersistenceProvider)
.findAny();
assertTrue(pp.isPresent());
}
@Test
void registerProviderClassSkipsClassesConfiguredOnClasspathButNotFound() throws Exception {
generateProviderFileContent("cz.cvut.kbss.jopa.UnknownClass");
final List<PersistenceProvider> result = resolver.getPersistenceProviders();
assertNotNull(result);
}
private void generateProviderFileContent(String content) throws Exception {
final File file = new File(Thread.currentThread().getContextClassLoader().getResource(
"META-INF/services/" + PersistenceProperties.JPA_PERSISTENCE_PROVIDER).getFile());
Files.write(file.toPath(), content.getBytes(), StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.WRITE);
}
}