InputStream Matcher for Mockito

InputStreamMatcher

package test.support;

import com.google.common.io.CharStreams;
import lombok.AllArgsConstructor;
import lombok.SneakyThrows;
import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import static org.mockito.Matchers.argThat;

@AllArgsConstructor
public class InputStreamMatcher extends BaseMatcher<InputStream> {

    private final String expectedData;

    @SneakyThrows(IOException.class)
    @Override public boolean matches(Object item) {
        InputStream inputStream = (InputStream) item;

        String actual = CharStreams.toString(new InputStreamReader(inputStream));
        inputStream.reset();

        return actual.equals(expectedData);
    }

    @Override public void describeTo(Description description) {
        description.appendText("InputStream containing ").appendValue(expectedData);
    }

    public static InputStream matchesContent(String expected) {
        return argThat(new InputStreamMatcher(expected));
    }
}