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OptionalDoubleSubject.java
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OptionalDoubleSubject.java
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/*
* Copyright (c) 2016 Google, Inc.
*
* 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.truth;
import static com.google.common.truth.Fact.fact;
import static com.google.common.truth.Fact.simpleFact;
import java.util.OptionalDouble;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Propositions for Java 8 {@link OptionalDouble} subjects.
*
* @author Ben Douglass
*/
@SuppressWarnings("Java7ApiChecker") // used only from APIs with Java 8 in their signatures
@IgnoreJRERequirement
public final class OptionalDoubleSubject extends Subject {
private final OptionalDouble actual;
OptionalDoubleSubject(
FailureMetadata failureMetadata,
@Nullable OptionalDouble subject,
@Nullable String typeDescription) {
super(failureMetadata, subject, typeDescription);
this.actual = subject;
}
/** Fails if the {@link OptionalDouble} is empty or the subject is null. */
public void isPresent() {
if (actual == null) {
failWithActual(simpleFact("expected present optional"));
} else if (!actual.isPresent()) {
failWithoutActual(simpleFact("expected to be present"));
}
}
/** Fails if the {@link OptionalDouble} is present or the subject is null. */
public void isEmpty() {
if (actual == null) {
failWithActual(simpleFact("expected empty optional"));
} else if (actual.isPresent()) {
failWithoutActual(
simpleFact("expected to be empty"),
fact("but was present with value", actual.getAsDouble()));
}
}
/**
* Fails if the {@link OptionalDouble} does not have the given value or the subject is null. This
* method is <i>not</i> recommended when the code under test is doing any kind of arithmetic,
* since the exact result of floating point arithmetic is sensitive to apparently trivial changes.
* More sophisticated comparisons can be done using {@code assertThat(optional.getAsDouble())…}.
* This method is recommended when the code under test is specified as either copying a value
* without modification from its input or returning a well-defined literal or constant value.
*/
public void hasValue(double expected) {
if (actual == null) {
failWithActual("expected an optional with value", expected);
} else if (!actual.isPresent()) {
failWithoutActual(fact("expected to have value", expected), simpleFact("but was absent"));
} else {
checkNoNeedToDisplayBothValues("getAsDouble()")
.that(actual.getAsDouble())
.isEqualTo(expected);
}
}
public static Subject.Factory<OptionalDoubleSubject, OptionalDouble> optionalDoubles() {
return (metadata, subject) -> new OptionalDoubleSubject(metadata, subject, "optionalDouble");
}
}