IDLE: Test stackbrowser.Stackbrowser

[terryjreedy]

BPO	33905
Nosy	@terryjreedy, @miss-islington
PRs	bpo-33905: Add test for idlelib.stackview.StackBrowser. #7852 [3.7] bpo-33905: Add test for idlelib.stackview.StackBrowser. (GH-7852) #7853 [3.6] bpo-33905: Add test for idlelib.stackview.StackBrowser. (GH-7852) #7854

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = <Date 2018-06-22.02:52:14.959>
created_at = <Date 2018-06-19.22:26:07.316>
labels = ['3.8', 'expert-IDLE', 'type-feature', '3.7']
title = 'IDLE: Test stackbrowser.Stackbrowser'
updated_at = <Date 2018-06-22.02:52:14.957>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2018-06-22.02:52:14.957>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-06-22.02:52:14.959>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-06-19.22:26:07.316>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 33905
keywords = ['patch']
message_count = 4.0
messages = ['320203', '320205', '320206', '320208']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'miss-islington']
pr_nums = ['7852', '7853', '7854']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33905'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[terryjreedy]

New changeset bcd3a1a by Terry Jan Reedy in branch 'master':
bpo-33905: Add test for idlelib.stackview.StackBrowser. (GH-7852)
bcd3a1a

[miss-islington]

New changeset d554414 by Miss Islington (bot) in branch '3.7':
bpo-33905: Add test for idlelib.stackview.StackBrowser. (GH-7852)
d554414

[miss-islington]

New changeset a0622f1 by Miss Islington (bot) in branch '3.6':
bpo-33905: Add test for idlelib.stackview.StackBrowser. (GH-7852)
a0622f1

[terryjreedy]

(My initial messages contained a mistaken idea based on a mis-remembering the details sys.last values and exceptions.)

If an exception is not caught and a traceback is printed, sys.last_type, sys.last_value, and sys.last_traceback are set. When an exception is caught, the last_ x values are not touched, but the same are available by calling sys.exc_info. Stackview accessed all 3 sys.last_x values, but they are not normally set when testing because exception are caught. The test sets them from a sys.exc_info after catching an exception.