io.github.olib963.javatest.matchers.internal.CauseMatcher Maven / Gradle / Ivy

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Matchers to create assertions from common conditions

There is a newer version: 0.2.0

package io.github.olib963.javatest.matchers.internal;

import io.github.olib963.javatest.matchers.MatchResult;
import io.github.olib963.javatest.matchers.Matcher;

public class CauseMatcher implements Matcher {
    private final Matcher causeMatcher;

    public CauseMatcher(Matcher causeMatcher) {
        this.causeMatcher = causeMatcher;
    }

    @Override
    public MatchResult matches(Throwable value) {
        var cause = value.getCause();
        return causeMatcher.matches(cause)
                .mapMismatch(mismatch -> "cause {" + cause + "} " + mismatch);
    }

    @Override
    public String describeExpected() {
        return "have a cause that was expected to " + causeMatcher.describeExpected();
    }
}