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Mock objects library for java
/*
* Copyright (c) 2016 Mockito contributors
* This program is made available under the terms of the MIT License.
*/
package org.mockito.hamcrest;
import static org.mockito.internal.hamcrest.MatcherGenericTypeExtractor.genericTypeOfMatcher;
import static org.mockito.internal.progress.ThreadSafeMockingProgress.mockingProgress;
import static org.mockito.internal.util.Primitives.defaultValue;
import org.hamcrest.Matcher;
import org.mockito.ArgumentMatcher;
import org.mockito.internal.hamcrest.HamcrestArgumentMatcher;
/**
* Allows matching arguments with hamcrest matchers.
* Requires hamcrest on classpath,
* Mockito does not depend on hamcrest!
* Note the NullPointerException auto-unboxing caveat described below.
*
* Before implementing or reusing an existing hamcrest matcher please read
* how to deal with sophisticated argument matching in {@link ArgumentMatcher}.
*
* Mockito 2.1.0 was decoupled from Hamcrest to avoid version incompatibilities
* that have impacted our users in past. Mockito offers a dedicated API to match arguments
* via {@link ArgumentMatcher}.
* Hamcrest integration is provided so that users can take advantage of existing Hamcrest matchers.
*
* Example:
*
* import static org.mockito.hamcrest.MockitoHamcrest.argThat;
*
* //stubbing
* when(mock.giveMe(argThat(new MyHamcrestMatcher())));
*
* //verification
* verify(mock).giveMe(argThat(new MyHamcrestMatcher()));
*
* NullPointerException auto-unboxing caveat.
* In rare cases when matching primitive parameter types you *must* use relevant intThat(), floatThat(), etc. method.
* This way you will avoid NullPointerException during auto-unboxing.
* Due to how java works we don't really have a clean way of detecting this scenario and protecting the user from this problem.
* Hopefully, the javadoc describes the problem and solution well.
* If you have an idea how to fix the problem, let us know via the mailing list or the issue tracker.
*
* By default, a matcher passed to a varargs parameter will match against the first element in the varargs array.
* To match against the raw varargs array pass the type of the varargs parameter to {@link MockitoHamcrest#argThat(Matcher, Class)}
*
* For example, to match any number of {@code String} values:
*
* import static org.hamcrest.CoreMatchers.isA;
* import static org.mockito.hamcrest.MockitoHamcrest.argThat;
*
* // Given:
* void varargMethod(String... args);
*
* //stubbing
* when(mock.varargMethod(argThat(isA(String[].class), String[].class));
*
* //verification
* verify(mock).giveMe(argThat(isA(String[].class), String[].class));
*
*
* @since 2.1.0
*/
public final class MockitoHamcrest {
/**
* Allows matching arguments with hamcrest matchers.
*
* See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return null or default value for primitive (0, false, etc.)
* @since 2.1.0
*/
@SuppressWarnings("unchecked")
public static T argThat(Matcher matcher) {
reportMatcher(matcher);
return (T) defaultValue(genericTypeOfMatcher(matcher.getClass()));
}
/**
* Allows matching arguments with hamcrest matchers.
*
* This variant can be used to pass an explicit {@code type},
* which can be useful to provide a matcher that matches against all
* elements in a varargs parameter.
*
* See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @param type the type the matcher matches.
* @return null or default value for primitive (0, false, etc.)
* @since 5.0.0
*/
@SuppressWarnings("unchecked")
public static T argThat(Matcher matcher, Class type) {
reportMatcher(matcher, type);
return (T) defaultValue(genericTypeOfMatcher(matcher.getClass()));
}
/**
* Enables integrating hamcrest matchers that match primitive char arguments.
* Note that {@link #argThat} will not work with primitive char matchers due to NullPointerException auto-unboxing caveat.
*
* See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return 0.
*/
public static char charThat(Matcher matcher) {
reportMatcher(matcher);
return 0;
}
/**
* Enables integrating hamcrest matchers that match primitive boolean arguments.
* Note that {@link #argThat} will not work with primitive boolean matchers due to NullPointerException auto-unboxing caveat.
*
* See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return false.
*/
public static boolean booleanThat(Matcher matcher) {
reportMatcher(matcher);
return false;
}
/**
* Enables integrating hamcrest matchers that match primitive byte arguments.
* Note that {@link #argThat} will not work with primitive byte matchers due to NullPointerException auto-unboxing caveat.
*
* * See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return 0.
*/
public static byte byteThat(Matcher matcher) {
reportMatcher(matcher);
return 0;
}
/**
* Enables integrating hamcrest matchers that match primitive short arguments.
* Note that {@link #argThat} will not work with primitive short matchers due to NullPointerException auto-unboxing caveat.
*
* * See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return 0.
*/
public static short shortThat(Matcher matcher) {
reportMatcher(matcher);
return 0;
}
/**
* Enables integrating hamcrest matchers that match primitive int arguments.
* Note that {@link #argThat} will not work with primitive int matchers due to NullPointerException auto-unboxing caveat.
*
* * See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return 0.
*/
public static int intThat(Matcher matcher) {
reportMatcher(matcher);
return 0;
}
/**
* Enables integrating hamcrest matchers that match primitive long arguments.
* Note that {@link #argThat} will not work with primitive long matchers due to NullPointerException auto-unboxing caveat.
*
* * See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return 0.
*/
public static long longThat(Matcher matcher) {
reportMatcher(matcher);
return 0;
}
/**
* Enables integrating hamcrest matchers that match primitive float arguments.
* Note that {@link #argThat} will not work with primitive float matchers due to NullPointerException auto-unboxing caveat.
*
* * See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return 0.
*/
public static float floatThat(Matcher matcher) {
reportMatcher(matcher);
return 0;
}
/**
* Enables integrating hamcrest matchers that match primitive double arguments.
* Note that {@link #argThat} will not work with primitive double matchers due to NullPointerException auto-unboxing caveat.
*
* * See examples in javadoc for {@link MockitoHamcrest} class
*
* @param matcher decides whether argument matches
* @return 0.
*/
public static double doubleThat(Matcher matcher) {
reportMatcher(matcher);
return 0;
}
private static void reportMatcher(Matcher matcher) {
reportMatcher(new HamcrestArgumentMatcher(matcher));
}
private static void reportMatcher(Matcher matcher, Class type) {
reportMatcher(new HamcrestArgumentMatcher(matcher, type));
}
private static void reportMatcher(final HamcrestArgumentMatcher matcher) {
mockingProgress().getArgumentMatcherStorage().reportMatcher(matcher);
}
private MockitoHamcrest() {}
}