### Question:
IoParameters implements Parameters { public Optional<JsonNode> getCache() { return getAsNode(CACHE); } protected  IoParameters(); protected  IoParameters(IoParameters other); protected  IoParameters(Map<String, JsonNode> queryParameters); protected  IoParameters(Map<String, JsonNode> queryParameters, File defaults); protected  IoParameters(MultiValueMap<String, JsonNode> queryParameters); protected  IoParameters(MultiValueMap<String, JsonNode> queryParameters, File defaults); private  IoParameters(File defaultConfig); boolean shallBehaveBackwardsCompatible(); IoParameters setParseExceptionHandle(BiConsumer<String, IoParseException> handle); int getOffset(); int getLimit(); int getWidth(); int getHeight(); boolean isBase64(); boolean isGrid(); boolean isGeneralize(); boolean isLegend(); String getLocale(); StyleProperties getSingleStyle(); Map<String, StyleProperties> getReferencedStyles(); boolean hasStyles(); String getFormat(); boolean isSetRawFormat(); String getRawFormat(); String getTimeFormat(); IntervalWithTimeZone getTimespan(); static IntervalWithTimeZone createDefaultTimespan(); static IntervalWithTimeZone createTimespan(DateTime from, DateTime to); String getOutputTimezone(); Instant getResultTime(); boolean shallClassifyByResultTimes(); boolean isAllResultTimes(); Set<String> getResultTimes(); Optional<Filter< ? >> getODataFilter(); Set<String> getCategories(); Set<String> getServices(); Set<String> getOfferings(); Set<String> getFeatures(); Set<String> getProcedures(); Set<String> getPhenomena(); Set<String> getStations(); Set<String> getPlatforms(); Set<String> getDatasets(); Set<String> getSamplings(); Set<String> getMeasuringPrograms(); Set<String> getFields(); Set<String> getPlatformGeometryTypes(); Set<String> getObservedGeometryTypes(); String getMobile(); String getInsitu(); Set<String> getDatasetTypes(); Set<String> getObservationTypes(); Set<String> getValueTypes(); Set<String> getSearchTerms(); Set<String> getGeometryTypes(); FilterResolver getFilterResolver(); BoundingBox getSpatialFilter(); String getCrs(); boolean isForceXY(); boolean isMatchDomainIds(); boolean isExpanded(); boolean isForceLatestValueRequests(); String getHrefBase(); boolean isShowTimeIntervals(); boolean isShowVerticalIntervals(); boolean containsParameter(String parameter); String getOther(String parameter); String getAsString(String parameter, String defaultValue); String getAsString(String parameter); int getAsInteger(String parameter, int defaultValue); int getAsInteger(String parameter); boolean getAsBoolean(String parameter, boolean defaultValue); boolean getAsBoolean(String parameter); static JsonNode getJsonNodeFrom(Object object); IoParameters removeAllOf(String key); IoParameters extendWith(String key, String... values); IoParameters extendWith(String key, Collection<String> values); IoParameters replaceWith(String key, String... values); IoParameters replaceWith(String key, Collection<String> values); @Override String toString(); static IoParameters createDefaults(); static IoParameters createDefaults(File defaultConfig); static IoParameters createFromMultiValueMap(MultiValueMap<String, String> query); static IoParameters createFromSingleValueMap(Map<String, String> query); IoParameters respectBackwardsCompatibility(); boolean isPureStationaryInsituQuery(); boolean isExpandWithNextValuesBeyondInterval(); boolean hasCache(); Optional<JsonNode> getCache(); boolean formatToUnixTime(); Set<String> getAggregation(); Integer getLevel();  }### Answer:
@Test public void testGetCache() { IoParameters parameters = createDefaults(); Optional<JsonNode> cache = parameters.getCache(); assertTrue(cache.isPresent()); assertTrue(cache.get().has("stations")); assertTrue(cache.get().get("stations").asLong(0) == 1440); }