Rewrite the test using GMTTempFile

pygmt/tests/test_figure.py

@@ -10,6 +10,7 @@
 import pytest
 from pygmt import Figure, set_display
 from pygmt.exceptions import GMTInvalidInput
+from pygmt.helpers import GMTTempFile
 
 
 def test_figure_region():
@@ -102,10 +103,9 @@ def test_figure_savefig_filename_with_spaces():
     """
     fig = Figure()
     fig.basemap(region=[0, 1, 0, 1], projection="X1c/1c", frame=True)
-    fname = "test_figure_savefig filename with spaces.png"
-    fig.savefig(fname)
-    assert os.path.exists(fname)
-    os.remove(fname)
+    with GMTTempFile(prefix="pygmt-filename with spaces", suffix=".png") as imgfile:
+        fig.savefig(imgfile.name)
+        assert os.path.exists(imgfile.name)
 
 
 def test_figure_savefig():