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/*
* Copyright (C) 2011 The Guava 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 com.google.common.base;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.testing.EqualsTester;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
import junit.framework.TestCase;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Field;
/**
* Tests for {@link Enums}.
*
* @author Steve McKay
*/
@GwtCompatible(emulated = true)
public class EnumsTest extends TestCase {
private enum TestEnum {
CHEETO,
HONDA,
POODLE,
}
private enum OtherEnum {}
public void testValueOfFunction() {
Function<String, TestEnum> function = Enums.valueOfFunction(TestEnum.class);
assertEquals(TestEnum.CHEETO, function.apply("CHEETO"));
assertEquals(TestEnum.HONDA, function.apply("HONDA"));
assertEquals(TestEnum.POODLE, function.apply("POODLE"));
}
public void testValueOfFunction_caseSensitive() {
Function<String, TestEnum> function = Enums.valueOfFunction(TestEnum.class);
assertNull(function.apply("cHEETO"));
assertNull(function.apply("Honda"));
assertNull(function.apply("poodlE"));
}
public void testValueOfFunction_nullWhenNoMatchingConstant() {
Function<String, TestEnum> function = Enums.valueOfFunction(TestEnum.class);
assertNull(function.apply("WOMBAT"));
}
public void testValueOfFunction_equals() {
new EqualsTester()
.addEqualityGroup(
Enums.valueOfFunction(TestEnum.class), Enums.valueOfFunction(TestEnum.class))
.addEqualityGroup(Enums.valueOfFunction(OtherEnum.class))
.testEquals();
}
@GwtIncompatible("SerializableTester")
public void testValueOfFunction_serialization() {
Function<String, TestEnum> function = Enums.valueOfFunction(TestEnum.class);
SerializableTester.reserializeAndAssert(function);
}
public void testGetIfPresent() {
assertEquals(Optional.of(TestEnum.CHEETO), Enums.getIfPresent(TestEnum.class, "CHEETO"));
assertEquals(Optional.of(TestEnum.HONDA), Enums.getIfPresent(TestEnum.class, "HONDA"));
assertEquals(Optional.of(TestEnum.POODLE), Enums.getIfPresent(TestEnum.class, "POODLE"));
assertTrue(Enums.getIfPresent(TestEnum.class, "CHEETO").isPresent());
assertTrue(Enums.getIfPresent(TestEnum.class, "HONDA").isPresent());
assertTrue(Enums.getIfPresent(TestEnum.class, "POODLE").isPresent());
assertEquals(TestEnum.CHEETO, Enums.getIfPresent(TestEnum.class, "CHEETO").get());
assertEquals(TestEnum.HONDA, Enums.getIfPresent(TestEnum.class, "HONDA").get());
assertEquals(TestEnum.POODLE, Enums.getIfPresent(TestEnum.class, "POODLE").get());
}
public void testGetIfPresent_caseSensitive() {
assertFalse(Enums.getIfPresent(TestEnum.class, "cHEETO").isPresent());
assertFalse(Enums.getIfPresent(TestEnum.class, "Honda").isPresent());
assertFalse(Enums.getIfPresent(TestEnum.class, "poodlE").isPresent());
}
public void testGetIfPresent_whenNoMatchingConstant() {
assertEquals(Optional.absent(), Enums.getIfPresent(TestEnum.class, "WOMBAT"));
}
@GwtIncompatible("NullPointerTester")
public void testNullPointerExceptions() {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicStaticMethods(Enums.class);
}
@Retention(RetentionPolicy.RUNTIME)
private @interface ExampleAnnotation {}
private enum AnEnum {
@ExampleAnnotation FOO,
BAR
}
@GwtIncompatible("reflection")
public void testGetField() {
Field foo = Enums.getField(AnEnum.FOO);
assertEquals("FOO", foo.getName());
assertTrue(foo.isAnnotationPresent(ExampleAnnotation.class));
Field bar = Enums.getField(AnEnum.BAR);
assertEquals("BAR", bar.getName());
assertFalse(bar.isAnnotationPresent(ExampleAnnotation.class));
}
}
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