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For non-english environments, GridCoverage2D class loses "nullValues" and "testSingleBandedCoverage" function fails.
The creation of a CoverageInfo class in CatalogBuilder checks the "no data" flag to extract nullValues data. See:
https://github.com/geoserver/geoserver/blob/master/src/main/src/main/java/org/geoserver/catalog/CatalogBuilder.java#L1102
GeoTools adds this item in some situations as "localized" string:
https://github.com/geotools/geotools/blob/master/modules/plugin/geotiff/src/main/java/org/geotools/gce/geotiff/GeoTiffReader.java#L820
We have a spanish environment, and this text is "Falta de datos", because of this, the extraction of "nullValues" is losed.
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