diff --git a/test/test_latlons.py b/test/test_latlons.py
index 8056b7c7..6b510521 100644
--- a/test/test_latlons.py
+++ b/test/test_latlons.py
@@ -10,18 +10,65 @@
 @pytest.mark.parametrize(
     "filename, expected",
     [
+        # gridType='rotated_ll'
         ("cl00010000_ecoclimap_rot.grib1", [
             [-8.840292, 31.874274],
             [32.845938, 32.675248],
             [-36.036376, 64.895728],
             [57.967172, 66.542672],
         ]),
+        # gridType='regular_ll'
         ("gfs.grb", [
             [0.0, 90.0],
             [357.5, 90.0],
             [0.0, -90.0],
             [357.5, -90.0]
+        ]),
+        # gridType='lambert'
+        ("eta.grb", [
+            [-133.459, 12.19],
+            [-65.091275,14.334642],
+            [-152.855459, 54.535803],
+            [-49.385097, 57.289403]
+        ]),
+        # gridType='polar_stereographic'
+        ("ngm.grb", [
+            [-133.443, 7.647],
+            [-76.557281, 7.647150],
+            [173.746409, 44.287971],
+            [-23.74651083940669,44.288441]
+        ]),
+        # gridType='regular_gg'
+        ("flux.grb", [
+           [0.0, 88.54195],
+           [358.125, 88.541950],
+           [0.0, -88.54195],
+           [358.125, -88.54195]
+        ]),
+        # gridType='reduced_gg'
+        ("ecmwf_tigge.grb", [
+           [0.0, 89.655964],
+           [359.55, 89.655964],
+           [0.0,-89.655964],
+           [359.55, -89.655964]
+        ]),
+        # gridType='mercator'
+        ("dspr.temp.bin", [
+          [-68.027832, 16.977484],
+          [-63.9843, 16.97748],
+          [-68.02783299999994, 19.54449],
+          [-63.9843, 19.54449]
+        ]),
+        # gridType='reduced_ll'
+        ("reduced_latlon_surface.grib2", [
+          [0.0, 90.0],
+          [359.64, 90.0],
+          [0.0, -90.0],
+          [359.64, -90.0]
         ])
+        # no coverage for gridType = 'rotated_gg', 'albers', 'space_view',
+        # 'equatorial_azimuthal_equidistant','lambert_azimuthal_equal_area'
+        # (no sample grib files that use those grids)
     ])
 def test_latlons_corners(samplegribfile, expected):
     """Test the resulting grid data."""
@@ -40,7 +87,13 @@ def test_latlons_corners(samplegribfile, expected):
     "filename, pt_ji, expected",
     [
         ("cl00010000_ecoclimap_rot.grib1", [20, 17], [-6.549827, 36.674752]),
-        ("gfs.grb", [37, 24], [60., -2.5])
+        ("gfs.grb", [37, 24], [60., -2.5]),
+        ("eta.grb", [32, 31], [-114.320061, 39.636536]),
+        ("ngm.grb", [22, 17], [-124.093697, 42.418053]),
+        ("flux.grb", [47, 64], [120.0, -0.952367]),
+        ("ecmwf_tigge.grb", [200, 266], [119.7, -0.224718]),
+        ("dspr.temp.bin", [112, 113], [-66.676034, 18.2714926]),
+        ("reduced_latlon_surface.grib2", [250, 334], [119.99976, 0.0])
     ])
 def test_latlons_randpoint(samplegribfile, pt_ji, expected):
     """Test the resulting grid data."""