diff --git a/Lib/idlelib/CallTipWindow.py b/Lib/idlelib/CallTipWindow.py
index 84d22fd..170d146 100644
--- a/Lib/idlelib/CallTipWindow.py
+++ b/Lib/idlelib/CallTipWindow.py
@@ -133,37 +133,27 @@
 
 
 def _calltip_window(parent):  # htest #
-    import re
-    from tkinter import Tk, Text, LEFT, BOTH
+    from tkinter import Toplevel, Text, LEFT, BOTH
 
-    root = Tk()
-    root.title("Test calltips")
-    width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
-    root.geometry("+%d+%d"%(x, y + 150))
+    top = Toplevel(parent)
+    top.title("Test calltips")
+    top.geometry("200x100+%d+%d" % (parent.winfo_rootx() + 200,
+                  parent.winfo_rooty() + 150))
+    text = Text(top)
+    text.pack(side=LEFT, fill=BOTH, expand=1)
+    text.insert("insert", "string.split")
+    top.update()
+    calltip = CallTip(text)
 
-    class MyEditWin: # conceptually an editor_window
-        def __init__(self):
-            text = self.text = Text(root)
-            text.pack(side=LEFT, fill=BOTH, expand=1)
-            text.insert("insert", "string.split")
-            root.update()
-            self.calltip = CallTip(text)
-
-            text.event_add("<<calltip-show>>", "(")
-            text.event_add("<<calltip-hide>>", ")")
-            text.bind("<<calltip-show>>", self.calltip_show)
-            text.bind("<<calltip-hide>>", self.calltip_hide)
-
-            text.focus_set()
-            root.mainloop()
-
-        def calltip_show(self, event):
-            self.calltip.showtip("Hello world", "insert", "end")
-
-        def calltip_hide(self, event):
-            self.calltip.hidetip()
-
-    MyEditWin()
+    def calltip_show(event):
+        calltip.showtip("(s=Hello world)", "insert", "end")
+    def calltip_hide(event):
+        calltip.hidetip()
+    text.event_add("<<calltip-show>>", "(")
+    text.event_add("<<calltip-hide>>", ")")
+    text.bind("<<calltip-show>>", calltip_show)
+    text.bind("<<calltip-hide>>", calltip_hide)
+    text.focus_set()
 
 if __name__=='__main__':
     from idlelib.idle_test.htest import run
diff --git a/Lib/idlelib/ClassBrowser.py b/Lib/idlelib/ClassBrowser.py
index a0e782e..5be65ef 100644
--- a/Lib/idlelib/ClassBrowser.py
+++ b/Lib/idlelib/ClassBrowser.py
@@ -19,6 +19,9 @@
 from idlelib.TreeWidget import TreeNode, TreeItem, ScrolledCanvas
 from idlelib.configHandler import idleConf
 
+file_open = None  # Method...Item and Class...Item use this.
+# Normally PyShell.flist.open, but there is no PyShell.flist for htest.
+
 class ClassBrowser:
 
     def __init__(self, flist, name, path, _htest=False):
@@ -27,6 +30,9 @@
         """
         _htest - bool, change box when location running htest.
         """
+        global file_open
+        if not _htest:
+            file_open = PyShell.flist.open
         self.name = name
         self.file = os.path.join(path[0], self.name + ".py")
         self._htest = _htest
@@ -170,7 +176,7 @@
     def OnDoubleClick(self):
         if not os.path.exists(self.file):
             return
-        edit = PyShell.flist.open(self.file)
+        edit = file_open(self.file)
         if hasattr(self.cl, 'lineno'):
             lineno = self.cl.lineno
             edit.gotoline(lineno)
@@ -206,7 +212,7 @@
     def OnDoubleClick(self):
         if not os.path.exists(self.file):
             return
-        edit = PyShell.flist.open(self.file)
+        edit = file_open(self.file)
         edit.gotoline(self.cl.methods[self.name])
 
 def _class_browser(parent): #Wrapper for htest
@@ -221,8 +227,9 @@
     dir, file = os.path.split(file)
     name = os.path.splitext(file)[0]
     flist = PyShell.PyShellFileList(parent)
+    global file_open
+    file_open = flist.open
     ClassBrowser(flist, name, [dir], _htest=True)
-    parent.mainloop()
 
 if __name__ == "__main__":
     from idlelib.idle_test.htest import run
diff --git a/Lib/idlelib/ColorDelegator.py b/Lib/idlelib/ColorDelegator.py
index 22bb22f..13a9010 100644
--- a/Lib/idlelib/ColorDelegator.py
+++ b/Lib/idlelib/ColorDelegator.py
@@ -2,7 +2,6 @@
 import re
 import keyword
 import builtins
-from tkinter import *
 from idlelib.Delegator import Delegator
 from idlelib.configHandler import idleConf
 
@@ -234,20 +233,23 @@
         for tag in self.tagdefs:
             self.tag_remove(tag, "1.0", "end")
 
-def _color_delegator(parent):
+def _color_delegator(parent):  # htest #
+    from tkinter import Toplevel, Text
     from idlelib.Percolator import Percolator
-    root = Tk()
-    root.title("Test ColorDelegator")
-    width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
-    root.geometry("+%d+%d"%(x, y + 150))
-    source = "if somename: x = 'abc' # comment\nprint"
-    text = Text(root, background="white")
-    text.insert("insert", source)
+
+    top = Toplevel(parent)
+    top.title("Test ColorDelegator")
+    top.geometry("200x100+%d+%d" % (parent.winfo_rootx() + 200,
+                  parent.winfo_rooty() + 150))
+    source = "if somename: x = 'abc' # comment\nprint\n"
+    text = Text(top, background="white")
     text.pack(expand=1, fill="both")
+    text.insert("insert", source)
+    text.focus_set()
+
     p = Percolator(text)
     d = ColorDelegator()
     p.insertfilter(d)
-    root.mainloop()
 
 if __name__ == "__main__":
     from idlelib.idle_test.htest import run
diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index 1056552..bdf4a1a 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -1711,7 +1711,8 @@
     tk.call('set', 'tcl_nonwordchars', '[^a-zA-Z0-9_]')
 
 
-def _editor_window(parent):
+def _editor_window(parent):  # htest #
+    # error if close master window first - timer event, after script
     root = parent
     fixwordbreaks(root)
     if sys.argv[1:]:
@@ -1721,7 +1722,8 @@
     macosxSupport.setupApp(root, None)
     edit = EditorWindow(root=root, filename=filename)
     edit.text.bind("<<close-all-windows>>", edit.close_event)
-    parent.mainloop()
+    # Does not stop error, neither does following
+    # edit.text.bind("<<close-window>>", edit.close_event)
 
 if __name__ == '__main__':
     from idlelib.idle_test.htest import run
diff --git a/Lib/idlelib/GrepDialog.py b/Lib/idlelib/GrepDialog.py
index 5d22a9e..aa866d0 100644
--- a/Lib/idlelib/GrepDialog.py
+++ b/Lib/idlelib/GrepDialog.py
@@ -131,7 +131,7 @@
             self.top.withdraw()
 
 
-def _grep_dialog(parent):  # for htest
+def _grep_dialog(parent):  # htest #
     from idlelib.PyShell import PyShellFileList
     root = Tk()
     root.title("Test GrepDialog")
diff --git a/Lib/idlelib/configDialog.py b/Lib/idlelib/configDialog.py
index cd3d5c0..938b0bc 100644
--- a/Lib/idlelib/configDialog.py
+++ b/Lib/idlelib/configDialog.py
@@ -24,7 +24,7 @@
 
 class ConfigDialog(Toplevel):
 
-    def __init__(self, parent, title, _htest=False, _utest=False):
+    def __init__(self, parent, title='', _htest=False, _utest=False):
         """
         _htest - bool, change box location when running htest
         _utest - bool, don't wait_window when running unittest
@@ -36,7 +36,7 @@
         self.wm_withdraw()
 
         self.configure(borderwidth=5)
-        self.title('IDLE Preferences')
+        self.title(title or 'IDLE Preferences')
         self.geometry(
                 "+%d+%d" % (parent.winfo_rootx() + 20,
                 parent.winfo_rooty() + (30 if not _htest else 150)))
diff --git a/Lib/idlelib/dynOptionMenuWidget.py b/Lib/idlelib/dynOptionMenuWidget.py
index 877ca1b..515b4ba 100644
--- a/Lib/idlelib/dynOptionMenuWidget.py
+++ b/Lib/idlelib/dynOptionMenuWidget.py
@@ -2,17 +2,15 @@
 OptionMenu widget modified to allow dynamic menu reconfiguration
 and setting of highlightthickness
 """
-from tkinter import OptionMenu, _setit, Tk, StringVar, Button
-
 import copy
-import re
+from tkinter import OptionMenu, _setit, StringVar, Button
 
 class DynOptionMenu(OptionMenu):
     """
     unlike OptionMenu, our kwargs can include highlightthickness
     """
     def __init__(self, master, variable, value, *values, **kwargs):
-        #get a copy of kwargs before OptionMenu.__init__ munges them
+        # TODO copy value instead of whole dict
         kwargsCopy=copy.copy(kwargs)
         if 'highlightthickness' in list(kwargs.keys()):
             del(kwargs['highlightthickness'])
@@ -35,22 +33,24 @@
         if value:
             self.variable.set(value)
 
-def _dyn_option_menu(parent):
-    root = Tk()
-    root.title("Tets dynamic option menu")
-    var = StringVar(root)
-    width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
-    root.geometry("+%d+%d"%(x, y + 150))
+def _dyn_option_menu(parent):  # htest #
+    from tkinter import Toplevel
+
+    top = Toplevel()
+    top.title("Tets dynamic option menu")
+    top.geometry("200x100+%d+%d" % (parent.winfo_rootx() + 200,
+                  parent.winfo_rooty() + 150))
+    top.focus_set()
+
+    var = StringVar(top)
     var.set("Old option set") #Set the default value
-    dyn = DynOptionMenu(root,var, "old1","old2","old3","old4")
+    dyn = DynOptionMenu(top,var, "old1","old2","old3","old4")
     dyn.pack()
 
     def update():
-        dyn.SetMenu(["new1","new2","new3","new4"],value="new option set")
-
-    button = Button(root, text="Change option set", command=update)
+        dyn.SetMenu(["new1","new2","new3","new4"], value="new option set")
+    button = Button(top, text="Change option set", command=update)
     button.pack()
-    root.mainloop()
 
 if __name__ == '__main__':
     from idlelib.idle_test.htest import run
diff --git a/Lib/idlelib/idle_test/htest.py b/Lib/idlelib/idle_test/htest.py
index d0faf44..d673fe4 100644
--- a/Lib/idlelib/idle_test/htest.py
+++ b/Lib/idlelib/idle_test/htest.py
@@ -1,11 +1,24 @@
 '''Run human tests of Idle's window, dialog, and popup widgets.
 
 run(*tests)
-Run each callable in tests after finding the matching test spec in this file.
-If there are none, run an htest for each spec dict in this file after finding
-the matching callable in the module named in the spec.
+Create a master Tk window.  Within that, run each callable in tests
+after finding the matching test spec in this file.  If tests is empty,
+run an htest for each spec dict in this file after finding the matching
+callable in the module named in the spec.  Close the window to skip or
+end the test.
 
-In a tested module, let X be a global name bound to a widget callable.
+In a tested module, let X be a global name bound to a callable (class
+or function) whose .__name__ attrubute is also X (the usual situation).
+The first parameter of X must be 'parent'.  When called, the parent
+argument will be the root window.  X must create a child Toplevel
+window (or subclass thereof).  The Toplevel may be a test widget or
+dialog, in which case the callable is the corresonding class.  Or the
+Toplevel may contain the widget to be tested or set up a context in
+which a test widget is invoked.  In this latter case, the callable is a
+wrapper function that sets up the Toplevel and other objects.  Wrapper
+function names, such as _editor_window', should start with '_'.
+
+
 End the module with
 
 if __name__ == '__main__':
@@ -13,13 +26,25 @@
     from idlelib.idle_test.htest import run
     run(X)
 
-The X object must have a .__name__ attribute and a 'parent' parameter.
-X will often 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 '_'.
+To have wrapper functions and test invocation code ignored by coveragepy
+reports, put '# htest #' on the def statement header line.
 
-This file must contain a matching instance of the following template,
-with X.__name__ prepended, as in '_editor_window_spec ...'.
+def _wrapper(parent):  # htest #
+
+Also make sure that the 'if __name__' line matches the above.  Then have
+make sure that .coveragerc includes the following.
+
+[report]
+exclude_lines =
+    .*# htest #
+    if __name__ == .__main__.:
+
+(The "." instead of "'" is intentional and necessary.)
+
+
+To run any X, this file must contain a matching instance of the
+following template, with X.__name__ prepended to '_spec'.
+When all tests are run, the prefix is use to get X.
 
 _spec = {
     'file': '',
@@ -27,18 +52,19 @@
     'msg': ""
     }
 
-file (no .py): used in run() to import the file and get X.
-kwds: passed to X (**kwds), after 'parent' is added, to initialize X.
-title: an example; used for some widgets, delete if not.
-msg: displayed in a master window. Hints as to how the user might
-  test the widget. Close the window to skip or end the test.
+file (no .py): run() imports file.py.
+kwds: augmented with {'parent':root} and passed to X as **kwds.
+title: an example kwd; some widgets need this, delete if not.
+msg: master window hints about testing the widget.
 
-Modules not being tested at the moment:
+
+Modules and classes not being tested at the moment:
 PyShell.PyShellEditorWindow
 Debugger.Debugger
 AutoCompleteWindow.AutoCompleteWindow
 OutputWindow.OutputWindow (indirectly being tested with grep test)
 '''
+
 from importlib import import_module
 from idlelib.macosxSupport import _initializeTkVariantTests
 import tkinter as tk
@@ -79,7 +105,7 @@
 
 ConfigDialog_spec = {
     'file': 'configDialog',
-    'kwds': {'title': 'Settings',
+    'kwds': {'title': 'ConfigDialogTest',
              '_htest': True,},
     'msg': "IDLE preferences dialog.\n"
            "In the 'Fonts/Tabs' tab, changing font face, should update the "
@@ -92,6 +118,7 @@
            "changes made have persisted."
     }
 
+# TODO Improve message
 _dyn_option_menu_spec = {
     'file': 'dynOptionMenuWidget',
     'kwds': {},
@@ -100,10 +127,12 @@
            "Select one of the many options in the 'new option set'."
     }
 
+# TODO edit wrapper
 _editor_window_spec = {
    'file': 'EditorWindow',
     'kwds': {},
-    'msg': "Test editor functions of interest."
+    'msg': "Test editor functions of interest.\n"
+           "Best to close editor first."
     }
 
 GetCfgSectionNameDialog_spec = {