*/
    public static ExhaustiveLinesSearcher useUnifiedDiff() {
        return new ExhaustiveLinesSearcher(true);
    }

    /**
     * Uses the LCS (longest common subsequence) algorithm for presenting matches.
     *
     * @return searcher that uses a unified diff output
     */
    public static ExhaustiveLinesSearcher useLcsDiff() {
        return new ExhaustiveLinesSearcher(false);
    }

        switch (assertionFailureFormat) {
            case LINEWISE:
                return assertOutputContainsUsingSearcher(expectedText, ExhaustiveLinesSearcher.useLcsDiff());
            case UNIFIED:
                return assertOutputContainsUsingSearcher(expectedText, ExhaustiveLinesSearcher.useUnifiedDiff());
            default:

        switch (assertionFailureFormat) {
            case LINEWISE:
                return assertOutputContainsUsingSearcher(expectedText, ExhaustiveLinesSearcher.useLcsDiff());
            case UNIFIED:
                return assertOutputContainsUsingSearcher(expectedText, ExhaustiveLinesSearcher.useUnifiedDiff());
            default:

import spock.lang.Specification
import spock.lang.Subject

class ExhaustiveLinesSearcherTest extends Specification {
    @Subject
    def comparer = ExhaustiveLinesSearcher.useLcsDiff()

    // region: assertLinesContainedIn
    def "neither expected or actual lines can be empty"() {
        when:
        comparer.assertLinesContainedIn([], ["a"])
        then: