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UtilTest.java
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/**
* Copyright 2012-2021 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.Rule;
import org.junit.rules.ExpectedException;
import org.junit.Test;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.*;
import feign.codec.Decoder;
import static feign.Util.*;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
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<String>} 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<Reader>() {};
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
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
assertEquals("AAAAAAAA", retval);
}
@Test
public void emptyToNullInputNullOutputNull() {
// Arrange
final String string = null;
// Act
final String retval = Util.emptyToNull(string);
// Assert result
assertNull(retval);
}
@Test
public void isBlankInputNotNullOutputFalse() {
// Arrange
final String value = "AAAAAAAA";
// Act
final boolean retval = Util.isBlank(value);
// Assert result
assertEquals(false, retval);
}
@Test
public void isBlankInputNullOutputTrue() {
// Arrange
final String value = null;
// Act
final boolean retval = Util.isBlank(value);
// Assert result
assertEquals(true, retval);
}
@Test
public void isNotBlankInputNotNullOutputFalse() {
// Arrange
final String value = "";
// Act
final boolean retval = Util.isNotBlank(value);
// Assert result
assertEquals(false, retval);
}
@Test
public void isNotBlankInputNotNullOutputTrue() {
// Arrange
final String value = "AAAAAAAA";
// Act
final boolean retval = Util.isNotBlank(value);
// Assert result
assertEquals(true, retval);
}
@Test
public void caseInsensitiveCopyOfMap() {
// Arrange
Map<String, Collection<String>> sourceMap = new HashMap<>();
sourceMap.put("First", Arrays.asList("abc", "qwerty", "xyz"));
sourceMap.put("camelCase", Collections.singleton("123"));
// Act
Map<String, Collection<String>> actualMap = caseInsensitiveCopyOf(sourceMap);
// Assert result
assertThat(actualMap)
.hasEntrySatisfying("First", value -> {
assertThat(value).contains("xyz", "abc", "qwerty");
}).hasEntrySatisfying("first", value -> {
assertThat(value).contains("xyz", "abc", "qwerty");
}).hasEntrySatisfying("CAMELCASE", value -> {
assertThat(value).contains("123");
}).hasEntrySatisfying("camelcase", value -> {
assertThat(value).contains("123");
});
}
@Test
public void copyIsUnmodifiable() {
// Arrange
Map<String, Collection<String>> sourceMap = new HashMap<>();
sourceMap.put("First", Arrays.asList("abc", "qwerty", "xyz"));
sourceMap.put("camelCase", Collections.singleton("123"));
// Act
Map<String, Collection<String>> unmodifiableMap = caseInsensitiveCopyOf(sourceMap);
// Assert result
assertThatThrownBy(() -> unmodifiableMap.put("new", Collections.singleton("223322")))
.isInstanceOf(UnsupportedOperationException.class);
assertThatThrownBy(() -> unmodifiableMap.get("camelCase").clear())
.isInstanceOf(UnsupportedOperationException.class);
}
@Test
public void nullMap() {
// Act
Map<String, Collection<String>> actualMap = caseInsensitiveCopyOf(null);
// Assert result
assertThat(actualMap)
.isNotNull()
.isEmpty();
}
interface LastTypeParameter {
List<String> LIST_STRING = null;
Parameterized<List<String>> PARAMETERIZED_LIST_STRING = null;
Parameterized<? extends List<String>> PARAMETERIZED_WILDCARD_LIST_STRING = null;
ParameterizedDecoder<List<String>> PARAMETERIZED_DECODER_LIST_STRING = null;
ParameterizedDecoder<?> PARAMETERIZED_DECODER_UNBOUND = null;
}
interface ParameterizedDecoder<T extends List<String>> extends Decoder {
}
interface Parameterized<T> {
}
static class ParameterizedSubtype implements Parameterized<String> {
}
}