Add real figure unit test

setup.cfg

@@ -53,6 +53,7 @@ test =
     pytest
     pytest-doctestplus
     pytest-cov
+    pytest-mpl
 docs =
     sphinx
     sphinx-automodapi

solarmach/tests/figure_hashes_mpl_353.json

@@ -0,0 +1,4 @@
+{
+  "solarmach.tests.test.test_solarmach_plot": "81ac59e6d0803820cde44e62f6324990da07b837962a7450ec42fd208b44585e",
+  "solarmach.tests.test.test_solarmach_pfss": "f668036286f29197e67e26f5eeec1dc70d93c0d1c8e58c323d27794126581141"
+}

solarmach/tests/test.py

@@ -7,7 +7,9 @@
 import numpy as np
 import pandas
 import pfsspy
+import pytest
 import sunpy
+from pathlib import Path
 from solarmach import SolarMACH, print_body_list, get_gong_map, calculate_pfss_solution, sc_distance
 
 
@@ -58,6 +60,7 @@ def test_solarmach_get_sw_speed():
     assert sm.coord_table[sm.coord_table['Spacecraft/Body']=='BepiColombo']['Vsw'].values[0] == 400.0
 
 
+@pytest.mark.mpl_image_compare(hash_library=Path(__file__).parent / 'figure_hashes_mpl_353.json')
 def test_solarmach_plot():
     body_list = ['STEREO-A']
     vsw_list = [400]
@@ -72,15 +75,16 @@ def test_solarmach_plot():
     background_spirals=[6, 600]
 
     sm = SolarMACH(date=date, body_list=body_list, vsw_list=vsw_list, reference_long=reference_long, reference_lat=reference_lat)
-    sm.plot(plot_spirals=True, plot_sun_body_line=True,
-            reference_vsw=reference_vsw, transparent=False,
-            show_earth_centered_coord=False, markers='numbers',
-            long_sector=long_sector, long_sector_vsw=long_sector_vsw, long_sector_color=long_sector_color,
-            background_spirals=background_spirals, outfile=filename)
-
+    fig, ax = sm.plot(plot_spirals=True, plot_sun_body_line=True,
+                      reference_vsw=reference_vsw, transparent=False,
+                      show_earth_centered_coord=False, markers='numbers',
+                      long_sector=long_sector, long_sector_vsw=long_sector_vsw, long_sector_color=long_sector_color,
+                      background_spirals=background_spirals, outfile=filename, return_plot_object=True)
     assert os.path.exists(os.getcwd()+os.sep+filename)
+    return fig
 
 
+@pytest.mark.mpl_image_compare(hash_library=Path(__file__).parent / 'figure_hashes_mpl_353.json')
 def test_solarmach_pfss():
     date = '2021-4-1 1:00:00'
     body_list = ['Earth', 'STEREO-A']
@@ -94,6 +98,7 @@ def test_solarmach_pfss():
                            markers='numbers', long_sector=[290, 328], long_sector_vsw=[400, 600],
                            long_sector_color='red', reference_vsw=400.0)
     assert isinstance(fig, matplotlib.figure.Figure)
+    return fig
 
 
 def test_sc_distance():

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{36,37,38}-test
+    py{38,39,310}-test
     build_docs
     codestyle
 isolated_build = true
@@ -9,7 +9,7 @@ skip_missing_interpreters = True
 
 [testenv]
 # Pass through the following environemnt variables which may be needed for the CI
-passenv = HOME WINDIR LC_ALL LC_CTYPE CC CI TRAVIS
+passenv = HOME, WINDIR, LC_ALL, LC_CTYPE, CC, CI, TRAVIS
 
 # Run the tests in a temporary directory to make sure that we don't import
 # the package from the source tree
@@ -34,7 +34,7 @@ extras =
 
 commands =
     pip freeze
-    pytest --pyargs solarmach {toxinidir}/docs --cov solarmach --cov-config={toxinidir}/setup.cfg {posargs}
+    pytest --pyargs solarmach {toxinidir}/docs --cov solarmach --cov-config={toxinidir}/setup.cfg {posargs} --mpl
 
 [testenv:build_docs]
 changedir = docs