Use unique earth_age tiles in test_dataset_to_strings_with_none_values

Author: seisman

pygmt/helpers/caching.py

@@ -42,6 +42,8 @@ def cache_data():
         # Names like @N35E135.earth_relief_03s_g.nc are for internal use only.
         # The naming scheme may change. DO NOT USE IT IN YOUR SCRIPTS.
         "@N00W030.earth_age_01m_g.nc",
+        "@N30E060.earth_age_01m_g.nc",
+        "@N30E090.earth_age_01m_g.nc",
         "@N00W030.earth_faa_01m_p.nc",
         "@N00W030.earth_geoid_01m_g.nc",
         "@S30W060.earth_mag_02m_p.nc",

pygmt/tests/test_datatypes_dataset.py

@@ -151,7 +151,7 @@ def test_dataset_to_strings_with_none_values():
 
     See the bug report at https://github.com/GenericMappingTools/pygmt/issues/3170.
     """
-    tiles = ["@N30W120.earth_relief_15s_p.nc", "@N00W010.earth_relief_15s_p.nc"]
+    tiles = ["@N30E060.earth_age_01m_g.nc", "@N30E090.earth_age_01m_g.nc"]
     paths = which(fname=tiles, download="a")
     assert len(paths) == 2
     # 'paths' may contain an empty string or not, depending on if the tiles are cached.