function deleteDatabaseEntries() {
		if (CacheManager) {
			return Promise.resolve(function() {
				Log.debug(new Date() + ". Deleting all entries");
			}).then(function() {
				return CacheManager.reset();
			}).then(function() {
				Log.debug(new Date() + ". Entries deleted ");
			});
		}
	}
Executes given method with given arguments and verifies the execution had happened.
@param {string} sMethod CacheManager method to call
@param {any[]} args Arguments to call the method with
@param {any} rejectValue value to reject the Promise with
@returns {Promise}