[R-package] added test on training with sparse features #2847
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guolinke
approved these changes
Mar 2, 2020
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#2831 noted a bug that could cause errors training with sparse features (features with some missing values). That issue has been closed and the bug fixed. In this PR, I propose adding a test in the R package to prevent us from re-introducing that bug.
Thanks to @rgranvil for the clean reproducible example. I just turned that example into a test.