Summary of skipped tests

[krlmlr]

Shows skipped tests, but only if there are no failures. Example:

Testing bigrquery
DBItest: Connection : ..SS..S.SS
1. Skip: DBItest: cannot_query_disconnected --------------------------------------------------------------------------------------------------------------
Not yet implemented

2. Skip: DBItest: cannot_disconnect_twice ----------------------------------------------------------------------------------------------------------------
by request

3. Skip: DBItest: stress_connections ---------------------------------------------------------------------------------------------------------------------
by request

4. Skip: DBItest: get_info_connection --------------------------------------------------------------------------------------------------------------------
Not yet implemented

5. Skip: DBItest: stress_load_connect_unload -------------------------------------------------------------------------------------------------------------
by request

DONE 

Will improve the coding once we agree on the concept.

Fixes #234.

CC @HarlanH @kenahoo-windlogics

Fixes #349 (=includes it).

[hadley]

I like the idea, but I think the output could be more compact, e.g.:

Skip: 

1. DBItest: cannot_query_disconnected - Not yet implemented
2. DBItest: cannot_disconnect_twice - by request
3. DBItest: stress_connections - by request
4. DBItest: get_info_connection - Not yet implemented
5. DBItest: stress_load_connect_unload - by request

[hadley]

This might also be a good template for how to handle warnings (#310)

[krlmlr]

Implemented more compact output.

[krlmlr]

Related: #310.

[krlmlr]

@hadley: How to include the context in the output, if at all? (Same question for error and warning output.)

[krlmlr]

Print file + line rather than context: #352

[krlmlr]

There are two possible file + line locations to report: The test that failed/warned/skipped, and the actual code that causes the error/warning/skip. The former should be always available, even if the latter is not (#352 (comment)).

[hadley]

I think we should try for the actual line of code, and fall back to the test.

[krlmlr]

This is complete "as is", file + line information should be handled separately (#352).