Migrate Figure.text tests to dvc

Related to #1131.

Author: michaelgrund

pygmt/tests/test_text.py

@@ -304,7 +304,7 @@ def test_text_angle_font_justify_from_textfile():
     return fig
 
 
-@check_figures_equal()
+@pytest.mark.mpl_image_compare
 def test_text_transparency():
     """
     Add texts with a constant transparency.
@@ -313,17 +313,12 @@ def test_text_transparency():
     y = np.arange(11, 20)
     text = [f"TEXT-{i}-{j}" for i, j in zip(x, y)]
 
-    fig_ref, fig_test = Figure(), Figure()
-    # Use single-character arguments for the reference image
-    with GMTTempFile() as tmpfile:
-        np.savetxt(tmpfile.name, np.c_[x, y, text], fmt="%s")
-        fig_ref.basemap(R="0/10/10/20", J="X10c", B="")
-        fig_ref.text(textfiles=tmpfile.name, t=50)
+    fig = Figure()
 
-    fig_test.basemap(region=[0, 10, 10, 20], projection="X10c", frame=True)
-    fig_test.text(x=x, y=y, text=text, transparency=50)
+    fig.basemap(region=[0, 10, 10, 20], projection="X10c", frame=True)
+    fig.text(x=x, y=y, text=text, transparency=50)
 
-    return fig_ref, fig_test
+    return fig
 
 
 @check_figures_equal()