Merge pull request matplotlib#20451 from dmatos2012/testcov_textbox

Add initial TextBox widget testing

Author: QuLogic

lib/matplotlib/tests/test_widgets.py

@@ -254,6 +254,31 @@ def test_CheckButtons():
     check.disconnect(cid)
 
 
+def test_TextBox():
+    from unittest.mock import Mock
+    submit_event = Mock()
+    text_change_event = Mock()
+    ax = get_ax()
+
+    tool = widgets.TextBox(ax, 'Evaluate')
+    tool.on_submit(submit_event)
+    tool.on_text_change(text_change_event)
+    tool.set_val('x**2')
+
+    assert tool.text == 'x**2'
+    assert text_change_event.call_count == 1
+
+    tool.begin_typing(tool.text)
+    tool.stop_typing()
+
+    assert submit_event.call_count == 2
+    do_event(tool, '_click')
+    do_event(tool, '_keypress', key='+')
+    do_event(tool, '_keypress', key='5')
+
+    assert text_change_event.call_count == 3
+
+
 @image_comparison(['check_radio_buttons.png'], style='mpl20', remove_text=True)
 def test_check_radio_buttons_image():
     # Remove this line when this test image is regenerated.