/**
* Copyright 2012-2020 The Feign Authors
*
* 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 feign;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.rules.ExpectedException;
import org.junit.Test;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import feign.codec.Decoder;
import static feign.Util.emptyToNull;
import static feign.Util.removeValues;
import static feign.Util.resolveLastTypeParameter;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;
public class UtilTest {
@Rule
public ExpectedException thrown = ExpectedException.none();
@Test
public void removesEmptyStrings() {
String[] values = new String[] {"", null};
assertThat(removeValues(values, (value) -> emptyToNull(value) == null, String.class))
.isEmpty();
}
@Test
public void removesEvenNumbers() {
Integer[] values = new Integer[] {22, 23};
assertThat(removeValues(values, (number) -> number % 2 == 0, Integer.class))
.containsExactly(23);
}
@Test
public void emptyValueOf() throws Exception {
assertEquals(false, Util.emptyValueOf(boolean.class));
assertEquals(false, Util.emptyValueOf(Boolean.class));
assertThat((byte[]) Util.emptyValueOf(byte[].class)).isEmpty();
assertEquals(Collections.emptyList(), Util.emptyValueOf(Collection.class));
assertThat((Iterator>) Util.emptyValueOf(Iterator.class)).isEmpty();
assertEquals(Collections.emptyList(), Util.emptyValueOf(List.class));
assertEquals(Collections.emptyMap(), Util.emptyValueOf(Map.class));
assertEquals(Collections.emptySet(), Util.emptyValueOf(Set.class));
assertEquals(Optional.empty(), Util.emptyValueOf(Optional.class));
}
/** In other words, {@code List} is as empty as {@code List>}. */
@Test
public void emptyValueOf_considersRawType() throws Exception {
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
assertThat((List>) Util.emptyValueOf(listStringType)).isEmpty();
}
/** Ex. your {@code Foo} object would be null, but so would things like Number. */
@Test
public void emptyValueOf_nullForUndefined() throws Exception {
assertThat(Util.emptyValueOf(Number.class)).isNull();
assertThat(Util.emptyValueOf(Parameterized.class)).isNull();
}
@Test
public void resolveLastTypeParameterWhenNotSubtype() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_LIST_STRING").getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, Parameterized.class);
assertEquals(listStringType, last);
}
@Test
public void lastTypeFromInstance() throws Exception {
Parameterized> instance = new ParameterizedSubtype();
Type last = resolveLastTypeParameter(instance.getClass(), Parameterized.class);
assertEquals(String.class, last);
}
@Test
public void lastTypeFromAnonymous() throws Exception {
Parameterized> instance = new Parameterized() {};
Type last = resolveLastTypeParameter(instance.getClass(), Parameterized.class);
assertEquals(Reader.class, last);
}
@Test
public void resolveLastTypeParameterWhenWildcard() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_WILDCARD_LIST_STRING")
.getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, Parameterized.class);
assertEquals(listStringType, last);
}
@Test
public void resolveLastTypeParameterWhenParameterizedSubtype() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_DECODER_LIST_STRING")
.getGenericType();
Type listStringType = LastTypeParameter.class.getDeclaredField("LIST_STRING").getGenericType();
Type last = resolveLastTypeParameter(context, ParameterizedDecoder.class);
assertEquals(listStringType, last);
}
@Test
public void unboundWildcardIsObject() throws Exception {
Type context =
LastTypeParameter.class.getDeclaredField("PARAMETERIZED_DECODER_UNBOUND").getGenericType();
Type last = resolveLastTypeParameter(context, ParameterizedDecoder.class);
assertEquals(Object.class, last);
}
@Test
public void checkArgumentInputFalseNotNullNullOutputIllegalArgumentException() {
// Arrange
final boolean expression = false;
final String errorMessageTemplate = "";
final Object[] errorMessageArgs = null;
// Act
thrown.expect(IllegalArgumentException.class);
Util.checkArgument(expression, errorMessageTemplate, errorMessageArgs);
// Method is not expected to return due to exception thrown
}
@Test
public void checkNotNullInputNullNotNullNullOutputNullPointerException() {
// Arrange
final Object reference = null;
final String errorMessageTemplate = "";
final Object[] errorMessageArgs = null;
// Act
thrown.expect(NullPointerException.class);
Util.checkNotNull(reference, errorMessageTemplate, errorMessageArgs);
// Method is not expected to return due to exception thrown
}
@Test
public void checkNotNullInputZeroNotNull0OutputZero() {
// Arrange
final Object reference = 0;
final String errorMessageTemplate = " ";
final Object[] errorMessageArgs = {};
// Act
final Object retval = Util.checkNotNull(reference, errorMessageTemplate, errorMessageArgs);
// Assert result
Assert.assertEquals(new Integer(0), retval);
}
@Test
public void checkStateInputFalseNotNullNullOutputIllegalStateException() {
// Arrange
final boolean expression = false;
final String errorMessageTemplate = "";
final Object[] errorMessageArgs = null;
// Act
thrown.expect(IllegalStateException.class);
Util.checkState(expression, errorMessageTemplate, errorMessageArgs);
// Method is not expected to return due to exception thrown
}
@Test
public void emptyToNullInputNotNullOutputNotNull() {
// Arrange
final String string = "AAAAAAAA";
// Act
final String retval = Util.emptyToNull(string);
// Assert result
Assert.assertEquals("AAAAAAAA", retval);
}
@Test
public void emptyToNullInputNullOutputNull() {
// Arrange
final String string = null;
// Act
final String retval = Util.emptyToNull(string);
// Assert result
Assert.assertNull(retval);
}
@Test
public void isBlankInputNotNullOutputFalse() {
// Arrange
final String value = "AAAAAAAA";
// Act
final boolean retval = Util.isBlank(value);
// Assert result
Assert.assertEquals(false, retval);
}
@Test
public void isBlankInputNullOutputTrue() {
// Arrange
final String value = null;
// Act
final boolean retval = Util.isBlank(value);
// Assert result
Assert.assertEquals(true, retval);
}
@Test
public void isNotBlankInputNotNullOutputFalse() {
// Arrange
final String value = "";
// Act
final boolean retval = Util.isNotBlank(value);
// Assert result
Assert.assertEquals(false, retval);
}
@Test
public void isNotBlankInputNotNullOutputTrue() {
// Arrange
final String value = "AAAAAAAA";
// Act
final boolean retval = Util.isNotBlank(value);
// Assert result
Assert.assertEquals(true, retval);
}
interface LastTypeParameter {
final List LIST_STRING = null;
final Parameterized> PARAMETERIZED_LIST_STRING = null;
final Parameterized extends List> PARAMETERIZED_WILDCARD_LIST_STRING = null;
final ParameterizedDecoder> PARAMETERIZED_DECODER_LIST_STRING = null;
final ParameterizedDecoder> PARAMETERIZED_DECODER_UNBOUND = null;
}
interface ParameterizedDecoder> extends Decoder {
}
interface Parameterized {
}
static class ParameterizedSubtype implements Parameterized {
}
}