Issue #18104: Add idlelib/idle_test/htest.py with a few sample tests to begin

consolidating and improving human-validated tests of Idle. Change other files
as needed to work with htest.  Running the module as __main__ runs all tests.

Lib/idlelib/idle_test/htest.py

@@ -0,0 +1,91 @@
+'''Run a human test of Idle wndow, dialog, and other widget classes.
+
+run(klass) runs a test for one class.
+runall() runs all the defined tests
+
+The file wih the widget class should end with
+if __name__ == '__main__':
+    <unittest, if there is one>
+    from idlelib.idle_test.htest import run
+    run(X)
+where X is a global object of the module. X must be a callable with a
+.__name__ attribute that accepts a 'parent' attribute. X will usually be
+a widget class, but a callable instance with .__name__ or a wrapper
+function also work. The name of wrapper functions, like _Editor_Window,
+should start with '_'.
+
+This file must then contain an instance of this template.
+_spec = {
+    'file': '',
+    'kwds': {'title': ''},
+    'msg': ""
+    }
+with X.__name__ prepended to _spec.
+File (no .py) is used in runall() to import the file and get the class.
+Kwds is passed to X (**kwds) after 'parent' is added, to initialize X.
+Msg. displayed is a window with a start button. hint as to how the user
+might test the widget. Closing The box skips or ends the test.
+'''
+from importlib import import_module
+import tkinter as tk
+
+# Template for class_spec dicts, copy and uncomment
+
+_Editor_window_spec = {
+    'file': 'EditorWindow',
+    'kwds': {},
+    'msg': "Test editor functions of interest"
+    }
+
+_Help_dialog_spec = {
+    'file': 'EditorWindow',
+    'kwds': {},
+    'msg': "If the help text displays, this works"
+    }
+
+AboutDialog_spec = {
+    'file': 'aboutDialog',
+    'kwds': {'title': 'About test'},
+    'msg': "Try each button"
+    }
+
+
+GetCfgSectionNameDialog_spec = {
+    'file': 'configSectionNameDialog',
+    'kwds': {'title':'Get Name',
+                 'message':'Enter something',
+                 'used_names': {'abc'},
+                 '_htest': True},
+    'msg': "After the text entered with [Ok] is stripped, <nothing>, "
+              "'abc', or more that 30 chars are errors.\n"
+              "Close 'Get Name' with a valid entry (printed to Shell), [Cancel], or [X]",
+    }
+
+def run(klas):
+    "Test the widget class klas using _spec dict"
+    root = tk.Tk()
+    klas_spec = globals()[klas.__name__+'_spec']
+    klas_kwds = klas_spec['kwds']
+    klas_kwds['parent'] = root
+    # This presumes that Idle consistently uses 'parent'
+    def run_klas():
+        widget = klas(**klas_kwds)
+        try:
+            print(widget.result)
+        except AttributeError:
+            pass
+    tk.Label(root, text=klas_spec['msg'], justify='left').pack()
+    tk.Button(root, text='Test ' + klas.__name__, command=run_klas).pack()
+    root.mainloop()
+
+def runall():
+    'Run all tests. Quick and dirty version.'
+    for k, d in globals().items():
+        if k.endswith('_spec'):
+            mod = import_module('idlelib.' + d['file'])
+            klas = getattr(mod, k[:-5])
+            run(klas)
+
+if __name__ == '__main__':
+    runall()
+