module.exports = function(knex) {

  describe('Transactions', function() {

    it('can run with exec', function(ok) {

      knex.transaction(function(t) {
        t.commit();
      }).exec(ok);

    });

    it('should be able to commit transactions', function() {

      var id = null;
      return knex.transaction(function(t) {

        knex('accounts')
          .transacting(t)
          .returning('id')
          .insert({
            first_name: 'Transacting',
            last_name: 'User',
            email:'transaction-test1@example.com',
            logins: 1,
            about: 'Lorem ipsum Dolore labore incididunt enim.',
            created_at: new Date(),
            updated_at: new Date()
          }).then(function(resp) {
            return knex('test_table_two').transacting(t).insert({
              account_id: (id = resp[0]),
              details: '',
              status: 1
            });
          }).then(function() {
            t.commit('Hello world');
          });

      }).then(function(commitMessage) {
        expect(commitMessage).to.equal('Hello world');
        return knex('accounts').where('id', id).select('first_name');
      }).then(function(resp) {
        expect(resp).to.have.length(1);
      });
    });

    it('should be able to rollback transactions', function() {
      var id = null;
      var err = new Error('error message');
      return knex.transaction(function(t) {
        knex('accounts')
          .transacting(t)
          .returning('id')
          .insert({
            first_name: 'Transacting',
            last_name: 'User2',
            email:'transaction-test2@example.com',
            logins: 1,
            about: 'Lorem ipsum Dolore labore incididunt enim.',
            created_at: new Date(),
            updated_at: new Date()
          }).then(function(resp) {
            return knex('test_table_two').transacting(t).insert({
              account_id: (id = resp[0]),
              details: '',
              status: 1
            });
          }).then(function() {
            t.rollback(err);
          });
      }).catch(function(msg) {
        expect(msg).to.equal(err);
        return knex('accounts').where('id', id).select('first_name');
      }).then(function(resp) {
        expect(resp).to.be.empty;
      });
    });

    it('should be able to commit transactions with a resolved trx query', function() {

      var id = null;
      return knex.transaction(function(trx) {
        return trx('accounts')
          .returning('id')
          .insert({
            first_name: 'Transacting',
            last_name: 'User',
            email:'transaction-test3@example.com',
            logins: 1,
            about: 'Lorem ipsum Dolore labore incididunt enim.',
            created_at: new Date(),
            updated_at: new Date()
          }).then(function(resp) {
            return trx('test_table_two').insert({
              account_id: (id = resp[0]),
              details: '',
              status: 1
            });
          }).then(function() {
            return 'Hello World';
          });
      }).then(function(commitMessage) {
        expect(commitMessage).to.equal('Hello World');
        return knex('accounts').where('id', id).select('first_name');
      }).then(function(resp) {
        expect(resp).to.have.length(1);
      });
    });

    it('should be able to rollback transactions with rejected trx query', function() {
      var id = null;
      var err = new Error('error message');
      var __cid, count = 0;
      return knex.transaction(function(trx) {
        return trx('accounts')
          .returning('id')
          .insert({
            first_name: 'Transacting',
            last_name: 'User2',
            email:'transaction-test4@example.com',
            logins: 1,
            about: 'Lorem ipsum Dolore labore incididunt enim.',
            created_at: new Date(),
            updated_at: new Date()
          }).then(function(resp) {
            return trx.insert({
              account_id: (id = resp[0]),
              details: '',
              status: 1
            }).into('test_table_two');
          }).then(function() {
            throw err;
          });
      })
      .on('query', function(obj) {
        count++;
        if (!__cid) __cid = obj.__cid;
        expect(__cid).to.equal(obj.__cid);
      })
      .catch(function(msg) {
        expect(count).to.equal(4);
        expect(msg).to.equal(err);
        return knex('accounts').where('id', id).select('first_name');
      }).then(function(resp) {
        expect(resp).to.be.empty;
      });
    });

  });

};