                message: new MockBuilder(
                    {
                        from: 'test@valid.sender',
                        to: '-d0.1a@example.com'
                    },
                    'message\r\nline 2'
                )
            },
            function (err, data) {
                expect(err).to.exist;
                expect(data).to.not.exist;
                expect(output).to.equal('');
                client._spawn.restore();
                done();
            }
        );
    });
The software constructs a string for a command to executed by a separate component
in another control sphere, but it does not properly delimit the
intended arguments, options, or switches within that command string.