### Question:
SpotifyAPICalls { public Device[] getDevices() { Device[] devices; if (getSpotifyApi() != null && this.userData.getRefreshToken() != null) { GetUsersAvailableDevicesRequest getUsersAvailableDevicesRequest = getSpotifyApi().getUsersAvailableDevices() .build(); devices = exceptionHandlingWithResults(getUsersAvailableDevicesRequest::execute); if (devices != null) return devices; } return new Device[0]; }  SpotifyApi getSpotifyApi(); URI authorizationCodeUri(); boolean createRefreshToken(String authCode); void setClientID(String clientID); void setClientSecret(String clientSecret); boolean setCurrentDevice(String deviceID); boolean checkPlayerState(); Device[] getDevices(); Device getActiveDevice(); boolean checkDeviceIsLoggedIn(String deviceId); boolean playSongFromUri(String uri); boolean playListFromUri(String uri); boolean resume(); boolean pause(); boolean skip(); boolean back(); boolean setVolume(int volume); int getVolume(); CurrentlyPlayingContext getCurrentPlayingContext(); boolean getIsPlaying(); SearchResult searchInSpotify(String searchItem, String type, int limit); FeaturedPlaylists getFeaturedPlaylists(int limit); Paging<PlaylistSimplified> getOwnPlaylists(int limit); static final String SPOTIFY_CLIENTSECRET_KEY; static final String SPOTIFY_CLIENTID_KEY; static final String SPOTIFY_REFRSHTOKEN_KEY; static final int TOKEN_EXPIRE_TIME_OFFSET; static final String SPOTIFY_ERROR_TAG; }### Answer:
@Test public void testgetDevices() { doReturn(this.spotifyApi).when(this.spotifyAPICalls).getSpotifyApi(); assertThat(this.spotifyAPICalls.getDevices(), equalTo(new Device[0])); }