diff --git a/tests/grib_grid_mercator.sh b/tests/grib_grid_mercator.sh
index 825262b29..2be01a3fb 100755
--- a/tests/grib_grid_mercator.sh
+++ b/tests/grib_grid_mercator.sh
@@ -32,11 +32,30 @@ cat > $tempFilt <<EOF
  print "[distinctLongitudes]";
 EOF
 
-${tools_dir}/grib_filter $tempFilt $input
+${tools_dir}/grib_filter $tempFilt $input > $tempOut
 
 # Nearest function
 ${tools_dir}/grib_ls -l 19,-97,1 $input > $tempOut
 grep -q "Point chosen #1 index=618" $tempOut
 
+# Error conditions
+# ----------------
+input=${data_dir}/mercator.grib2
+set +e
+${tools_dir}/grib_get_data -s latitudeOfFirstGridPointInDegrees=90 $input > $tempOut 2>&1
+status=$?
+set -e
+[ $status -ne 0 ]
+grep -q "Transformation cannot be computed at the poles" $tempOut
+
+input=${data_dir}/mercator.grib2
+set +e
+${tools_dir}/grib_get_data -s Ni=1 $input > $tempOut 2>&1
+status=$?
+set -e
+[ $status -ne 0 ]
+grep -q "Wrong number of points" $tempOut
+
+
 # Clean up
 rm -f $tempFilt $tempOut