Add separate tests for poppler and ghostscript

tests/test_plotting.py

@@ -5,6 +5,7 @@ import os
 import pytest
 
 import camelot
+from camelot.backends.image_conversion import ImageConversionBackend
 
 
 testdir = os.path.dirname(os.path.abspath(__file__))
@@ -26,12 +27,19 @@ def test_textedge_plot():
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_lattice_contour_plot():
+def test_lattice_contour_plot_poppler():
     filename = os.path.join(testdir, "foo.pdf")
     tables = camelot.read_pdf(filename)
     return camelot.plot(tables[0], kind="contour")
 
 
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_lattice_contour_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend=ImageConversionBackend('ghostscript'))
+    return camelot.plot(tables[0], kind="contour")
+
+
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
 def test_stream_contour_plot():
     filename = os.path.join(testdir, "tabula/12s0324.pdf")
@@ -40,21 +48,42 @@ def test_stream_contour_plot():
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_line_plot():
+def test_line_plot_poppler():
     filename = os.path.join(testdir, "foo.pdf")
     tables = camelot.read_pdf(filename)
     return camelot.plot(tables[0], kind="line")
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_joint_plot():
+def test_line_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend=ImageConversionBackend('ghostscript'))
+    return camelot.plot(tables[0], kind="line")
+
+
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_joint_plot_poppler():
     filename = os.path.join(testdir, "foo.pdf")
     tables = camelot.read_pdf(filename)
     return camelot.plot(tables[0], kind="joint")
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_grid_plot():
+def test_joint_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend=ImageConversionBackend('ghostscript'))
+    return camelot.plot(tables[0], kind="joint")
+
+
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_grid_plot_poppler():
     filename = os.path.join(testdir, "foo.pdf")
     tables = camelot.read_pdf(filename)
     return camelot.plot(tables[0], kind="grid")
+
+
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_grid_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend=ImageConversionBackend('ghostscript'))
+    return camelot.plot(tables[0], kind="grid")