TST: shim mainloop in testing backend

Author: tacaswell

mpl_gui/__init__.py

@@ -76,8 +76,6 @@ def show(figs, *, block=None, timeout=0):
         block = not is_interactive()
 
     if block and len(managers):
-        # TODO expose the main loop more elegantly!
-        # TODO make timeout work!
         if timeout == 0:
             _cbm().Show().mainloop()
         elif len(managers):

mpl_gui/tests/conftest.py

@@ -1,4 +1,9 @@
-from matplotlib.backend_bases import _Backend, FigureCanvasBase, FigureManagerBase
+from matplotlib.backend_bases import (
+    _Backend,
+    FigureCanvasBase,
+    FigureManagerBase,
+    ShowBase,
+)
 import mpl_gui
 import sys
 
@@ -28,9 +33,15 @@ def destroy(self):
         self.call_info["destroy"] = {}
 
 
+class TestShow(ShowBase):
+    def mainloop(self):
+        ...
+
+
 class TestingBackend(_Backend):
     FigureCanvas = TestCanvas
     FigureManager = TestManger
+    Show = TestShow
 
 
 mpl_gui.switch_backend(TestingBackend)