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There is a newer version: 1.0.0-M12

package io.sphere.sdk.test;

import org.fest.assertions.GenericAssert;

import java.util.Optional;

import static java.lang.String.format;

public class OptionalAssert extends GenericAssert> {
    protected OptionalAssert(final Optional actual) {
        super(OptionalAssert.class, actual);
    }

    public static OptionalAssert assertThat(final Optional actual) {
        return new OptionalAssert(actual);
    }

    public OptionalAssert isPresentAs(final Object thing) {
        if (!actual.isPresent()) {
            failIfCustomMessageIsSet();
            throw failure(format("The optional is empty."));
        }
        if (!actual.get().equals(thing)) {
            failIfCustomMessageIsSet();
            throw failure(format("%s is not %s.", actual, Optional.ofNullable(thing)));
        }
        return this;
    }

    public OptionalAssert isPresent() {
        if (!actual.isPresent()) {
            failIfCustomMessageIsSet();
            throw failure(format("The optional is empty."));
        }
        return this;
    }

    public OptionalAssert isAbsent() {
        if (actual.isPresent()) {
            failIfCustomMessageIsSet();
            throw failure(format("The optional is filled: %s.", actual));
        }
        return this;
    }

    public OptionalAssert isEmpty() {
        return isAbsent();
    }

    public OptionalAssert butNotAs(final Object thing) {
        if (actual.get().equals(thing)) {
            failIfCustomMessageIsSet();
            throw failure(format("%s is %s.", actual, Optional.ofNullable(thing)));
        }
        return this;
    }

    public OptionalAssert isNotPresentAs(final Object thing) {
        if (actual.isPresent() && actual.get().equals(thing)) {
            failIfCustomMessageIsSet();
            throw failure(format("%s is %s.", actual, Optional.ofNullable(thing)));
        }
        return this;
    }
}