refactor test_sphinterpolate.py to remove grdinfo

Author: willschlitzer

pygmt/tests/test_sphinterpolate.py

@@ -4,7 +4,7 @@
 import os
 
 import numpy.testing as npt
-from pygmt import grdinfo, sphinterpolate
+from pygmt import sphinterpolate
 from pygmt.helpers import GMTTempFile
 
 
@@ -28,10 +28,7 @@ def test_sphinterpolate_no_outgrid():
     assert temp_grid.dims == ("lat", "lon")
     assert temp_grid.gmt.gtype == 1  # Geographic grid
     assert temp_grid.gmt.registration == 0  # Gridline registration
-    result = grdinfo(grid=temp_grid, force_scan="a", per_column="n").strip().split()
-    assert int(result[0]) == 0  # x minimum
-    assert int(result[1]) == 360  # x maximum
-    assert int(result[2]) == -90  # y minimum
-    assert int(result[3]) == 90  # y maximum
-    npt.assert_approx_equal(float(result[4]), -6908.19873047)  # v minimum
-    npt.assert_approx_equal(float(result[5]), 14628.1435547)  # v maximum
+    npt.assert_allclose(temp_grid.max(), 14628.144)
+    npt.assert_allclose(temp_grid.min(), -6908.1987)
+    npt.assert_allclose(temp_grid.median(), 118.96849)
+    npt.assert_allclose(temp_grid.mean(), 272.60593)