versionConstraint.branch = 'release'
                }
            }
        """
        repoB.createBranch('release')
        repoB.checkout('release')
        repoB.commit('version 1.2')
        repoB.createLightWeightTag('1.2')
        repoC.createBranch('release')
        repoC.checkout('release')
        repoC.commit('version 1.2')
        repoC.createLightWeightTag('1.2')

    @Override
    public Ref checkout(String branchName) throws GitAPIException {
        return backingRepo.checkout(branchName);
    }

    @Override
    public Ref createBranch(String branchName) throws GitAPIException {
        return backingRepo.createBranch(branchName);
    }

    @Override
    public Ref createLightWeightTag(String tagName) throws GitAPIException {
        return backingRepo.createLightWeightTag(tagName);
    }

import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.revwalk.RevCommit;
import org.gradle.test.fixtures.file.TestFile;

import java.net.URI;

public interface GitRepository {
    URI getUrl();

    Ref createBranch(String branchName) throws GitAPIException;

    Ref checkout(String branchName) throws GitAPIException;

    Ref createLightWeightTag(String tagName) throws GitAPIException;

    TestFile getWorkTree();

        }
        add.call();
        final CommitCommand commit = git.commit();
        commit.setSign(false);
        return commit.setMessage(message).call();
    }

    @Override
    public Ref createBranch(String branchName) throws GitAPIException {
        return git.branchCreate().setName(branchName).call();
    }

    @Override
    public Ref checkout(String branchName) throws GitAPIException {

        // Commit a file to the repository
        def textFile = repo.workTree.file('source.txt')
        textFile << 'Hello world!'
        c1 = repo.commit('Initial commit')
        repo.createBranch('release')
        repo.createLightWeightTag('1.0.1')
        repo.createAnnotatedTag('v1.0.1', 'Release 1.0.1')
        def anotherSource = repo.workTree.file('dir/another.txt')
        anotherSource << 'Goodbye world!'