Try just running test_grdimage_over_dateline first before other tests

Author: weiji14

Makefile

@@ -29,7 +29,8 @@ test:
 	@echo ""
 	@cd $(TESTDIR); python -c "import $(PROJECT); $(PROJECT).show_versions()"
 	@echo ""
-	cd $(TESTDIR); pytest $(PYTEST_ARGS) $(PROJECT)
+	cd $(TESTDIR); pytest -m runfirst --no-summary $(PYTEST_ARGS) $(PROJECT)
+	cd $(TESTDIR); pytest -m 'not runfirst' $(PYTEST_ARGS) $(PROJECT)
 	cp $(TESTDIR)/coverage.xml .
 	cp -r $(TESTDIR)/htmlcov .
 	rm -r $(TESTDIR)

pygmt/tests/test_grdimage.py

@@ -75,6 +75,7 @@ def test_grdimage_fails():
         fig.grdimage(np.arange(20).reshape((4, 5)))
 
 
+@pytest.mark.runfirst
 @pytest.mark.mpl_image_compare
 def test_grdimage_over_dateline(xrgrid):
     """