[Koha-bugs] [Bug 18356] Prediction pattern wrong, skips years, for some year based frequencies

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=18356

Kyle M Hall <kyle at bywatersolutions.com> changed:

           What    |Removed                     |Added
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             Status|Signed Off                  |Passed QA
  Attachment #64021|0                           |1
        is obsolete|                            |
  Attachment #64022|0                           |1
        is obsolete|                            |

Jonathan Druart <jonathan.druart at bugs.koha-community.org> changed:

           What    |Removed                     |Added
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             Status|Passed QA                   |Pushed to Master

--- Comment #12 from Kyle M Hall <kyle at bywatersolutions.com> ---
Created attachment 64310
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=64310&action=edit
Bug 18356: Extend GetNextDate.t, add GetFictiveIssueNumber.t (unit=year)

This patch deals with tests for yearly frequencies.

Adjust/extend GetNextDate.t:
[1] Adjust mixup of units/issues in a description.
[2] Add testing +2 years on 29-2 of leap year for freq 1 issue/2 years.
[3] Add tests for freq 9 issues/year.

Add GetFictiveIssueNumber.t:
[1] Two subtests are provided for irregular frequencies (very trivial) and
    for year frequencies (with four specific test cases).

Test plan:
[1] Run t/db_dependent/Serials/GetNextDate.t
[2] Run t/db_dependent/Serials/GetFictiveIssueNumber.t

Note: Without the second patch both tests should fail. This shows the need
of the adjustments in the second patch.

Signed-off-by: Marcel de Rooy <m.de.rooy at rijksmuseum.nl>

Signed-off-by: Josef Moravec <josef.moravec at gmail.com>

Signed-off-by: Kyle M Hall <kyle at bywatersolutions.com>

--- Comment #13 from Kyle M Hall <kyle at bywatersolutions.com> ---
Created attachment 64311
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=64311&action=edit
Bug 18356: Fix date calculations for yearly frequencies in Serials

The problem as described on BZ 18356 is a combination of an error in
GetFictiveIssueNumber and GetNextDate for unit==year.

[1] In GetNextDate the Add_Delta_YM calculation should be applied only to
frequencies based on years per unit.
In the case of multiple units per year we calculate the number of days to
add. And if we have reached the end of a cycle, we correct the
rounding applied in the cycle.
NOTE 1: We obsolete the idea here of rebasing dates on firstacqui. In case
of manual adjustments, we probably do not want it. And otherwise we do not
need it anymore due to the correction at the end of a cycle.
NOTE 2: The calls to Add_Delta_YM are intentionally not corrected for leap
years. Say you start at 2016-02-29. If you use 1/yr or 1/2yr, you will
switch to the Feb 28th in the following years. In 2020 there will be no
switch to Feb 29 again; if someone should need it, please use a manual
adjustment. This is probably highly exceptional.

[2] In GetFictiveIssueNumber the year should be decreased by one if you
have more units per year and you did not yet reach firstacqui day and
month. This affects calculations in GetNextDate with irregularities.
NOTE 1: I added a wrapper around Date::Calc::N_Delta_YMD in order to improve
its results; this will especially be needed when we use it later for
month units.
NOTE 2: In case of manual adjustments this calculation does not really make
sense. Another report should deal with improving irregularities.

Test plan:
[1] Verify that both GetNextDate.t as well as GetFictiveIssueNumber.t pass.
[2] Look at the prediction pattern for a few frequencies.
    For example: 1 iss/y, 1 iss/2y, 5 iss/y.

Signed-off-by: Marcel de Rooy <m.de.rooy at rijksmuseum.nl>

Signed-off-by: Josef Moravec <josef.moravec at gmail.com>

Signed-off-by: Kyle M Hall <kyle at bywatersolutions.com>

--- Comment #14 from Jonathan Druart <jonathan.druart at bugs.koha-community.org> ---
Pushed to master for 17.11, thanks to everybody involved!

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