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DatatypeTransformerTest.java
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DatatypeTransformerTest.java
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/**
* Copyright (C) 2022 Czech Technical University in Prague
* <p>
* 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.
* <p>
* 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.datatype;
import cz.cvut.kbss.jopa.datatype.exception.UnsupportedTypeTransformationException;
import cz.cvut.kbss.ontodriver.model.LangString;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import java.net.InetAddress;
import java.net.URL;
import java.util.stream.Stream;
import static org.junit.jupiter.api.Assertions.*;
class DatatypeTransformerTest {
@Test
void transformReturnsNullForNullInput() {
assertNull(DatatypeTransformer.transform(null, String.class));
}
@Test
void transformConvertsValueToTargetType() {
final Integer value = 117;
final Double result = DatatypeTransformer.transform(value, Double.class);
assertNotNull(result);
assertEquals(value.doubleValue(), result, 0.01);
}
@ParameterizedTest
@MethodSource("wideningConversionTestValues")
<T> void transformSupportsWideningConversion(Class<T> targetType, T expected, Object value) {
assertEquals(expected, DatatypeTransformer.transform(value, targetType));
}
private static Stream<Arguments> wideningConversionTestValues() {
return Stream.of(
Arguments.arguments(Long.class, 117L, 117),
Arguments.arguments(Float.class, 117.0f, 117),
Arguments.arguments(Double.class, 117.0, 117),
Arguments.arguments(Float.class, 117.0f, 117L),
Arguments.arguments(Double.class, 117.0, 117L)
);
}
@Test
void transformThrowsUnsupportedTypeConversionWhenNoTransformerIsFound() {
final Integer value = 117;
final UnsupportedTypeTransformationException ex = assertThrows(UnsupportedTypeTransformationException.class,
() -> DatatypeTransformer.transform(value, URL.class));
assertEquals(String.format("Cannot transform value %s of type %s to target type %s.", value, Integer.class,
URL.class), ex.getMessage());
}
@Test
void transformToStringDoesNotRequireExplicitTransformer() {
final Integer value = 117;
final String result = DatatypeTransformer.transform(value, String.class);
assertEquals(value.toString(), result);
}
@Test
void transformCastsValueWithoutTransformerWhenValueIsAssignableToTargetType() {
final Integer value = 117;
final Number result = DatatypeTransformer.transform(value, Number.class);
assertSame(result, value);
}
@Test
void transformSupportsConversionUsingConstructorWithParameterMatchingTransformedValueType() {
final String value = "http://onto.fel.cvut.cz";
final URL result = DatatypeTransformer.transform(value, URL.class);
assertNotNull(result);
assertEquals(value, result.toString());
}
@Test
void transformThrowsUnsupportedTypeConversionWhenTargetTypeDoesNotHaveMatchingConstructor() {
final String value = "https://onto.fel.cvut.cz";
final UnsupportedTypeTransformationException ex = assertThrows(UnsupportedTypeTransformationException.class,
() -> DatatypeTransformer.transform(value, InetAddress.class));
assertEquals(String.format("Cannot transform value %s of type %s to target type %s.", value, String.class,
InetAddress.class), ex.getMessage());
}
@Test
void transformTransformsLangStringToString() {
final LangString value = new LangString("test", "en");
final String result = DatatypeTransformer.transform(value, String.class);
assertEquals(value.getValue(), result);
}
}