  The first experimental campaigns have proven that, due to the optimization of
the magnetic configuration with respect to neoclassical transport, the
contribution of turbulence is essential to understand and predict the total
particle and energy transport in Wendelstein 7-X (W7-X). This has spurred much
work on gyrokinetic modelling for the interpretation of the available
experimental results and for the preparation of the next campaigns. At the same
time, new stellarator gyrokinetic codes have just been or are being developed.
It is therefore desirable to have a sufficiently complete, documented and
verified set of gyrokinetic simulations in W7-X geometry against which new
codes or upgrades of existing codes can be tested and benchmarked. This paper
attemps to provide such a set of simulations in the form of a comprehensive
benchmark between the recently developed code stella and the well-established
code GENE. The benchmark consists of electrostatic gyrokinetic simulations in
W7-X magnetic geometry and includes different flux tubes, linear
ion-temperature-gradient (ITG) and trapped-electron-mode (TEM)} stability
analyses, computation of linear zonal flow responses and calculation of
ITG-driven heat fluxes.
