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src/main/java/de/unistuttgart/iste/meitrex/common/testutil/MeitrexMatchers.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package de.unistuttgart.iste.meitrex.common.testutil; | ||
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| import org.hamcrest.FeatureMatcher; | ||
| import org.hamcrest.Matcher; | ||
| import org.springframework.graphql.ResponseError; | ||
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|
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| import java.util.Collection; | ||
| import java.util.function.Function; | ||
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| import static org.hamcrest.Matchers.contains; | ||
| import static org.hamcrest.Matchers.hasEntry; | ||
|
|
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| /** | ||
| * Collection of useful Hamcrest matchers. | ||
| */ | ||
| public class MeitrexMatchers { | ||
| private MeitrexMatchers() { | ||
| } | ||
|
|
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| /** | ||
| * Matcher that checks if a collection of {@link ResponseError}s contains exactly | ||
| * one error that matches the given matcher. | ||
| * | ||
| * @param errorMatcher the matcher for the response error to check against | ||
| * @return the matcher | ||
| */ | ||
| public static Matcher<Iterable<? extends ResponseError>> containsError(Matcher<ResponseError> errorMatcher) { | ||
| return contains(errorMatcher); | ||
| } | ||
|
|
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| /** | ||
| * Matcher for response errors that checks if the error is caused by a specific exception. | ||
| * | ||
| * @param exceptionClass the exception class | ||
| * @return the matcher | ||
| * @see #containsError(Matcher) | ||
| */ | ||
| public static Matcher<ResponseError> causedBy(Class<? extends Throwable> exceptionClass) { | ||
| return hasFeature("exception", | ||
| ResponseError::getExtensions, | ||
| hasEntry("exception", exceptionClass.getSimpleName())); | ||
| } | ||
|
|
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| /** | ||
| * Matcher for response errors that checks if the error has a specific message. | ||
| * | ||
| * @param messageMatcher the message | ||
| * @return the matcher | ||
| */ | ||
| public static Matcher<ResponseError> withMessage(Matcher<String> messageMatcher) { | ||
| return hasFeature("message", ResponseError::getMessage, messageMatcher); | ||
| } | ||
|
|
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| /** | ||
| * Matcher that accesses a function of the actual object and checks if the result matches the given matcher. | ||
| * This is useful, e.g., for checking if a certain field of an object has a specific value. | ||
| * | ||
| * @param accessor the function to access the feature | ||
| * @param matcher the matcher for the feature | ||
| * @param <T> type of the actual object | ||
| * @param <F> type of the feature | ||
| * @return the matcher | ||
| */ | ||
| public static <T, F> Matcher<T> hasFeature(Function<T, F> accessor, Matcher<F> matcher) { | ||
| return hasFeature("feature", accessor, matcher); | ||
| } | ||
|
|
||
| /** | ||
| * Like {@link #hasFeature(Function, Matcher)}, but with a custom feature name. | ||
| */ | ||
| public static <T, R> Matcher<T> hasFeature(String featureName, Function<T, R> accessor, Matcher<R> matcher) { | ||
| return new FeatureMatcher<>(matcher, "has " + featureName, featureName) { | ||
| @Override | ||
| protected R featureValueOf(T actual) { | ||
| return accessor.apply(actual); | ||
| } | ||
| }; | ||
| } | ||
|
|
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| /** | ||
| * Matcher that matches a collection of objects against a collection of matchers. | ||
| * | ||
| * @param collection the collection to match | ||
| * @param matcherFunction the function to create a matcher for each element | ||
| * @param <T> the type of the collection elements | ||
| * @param <E> the type of the matchers | ||
| * @return the array of matchers | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| public static <T, E> Matcher<E>[] each(Collection<T> collection, Function<T, Matcher<E>> matcherFunction) { | ||
| return (Matcher<E>[]) collection.stream() | ||
| .map(matcherFunction) | ||
| .toArray(Matcher[]::new); | ||
| } | ||
| } |
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