Add test for cube() support with .SDcols patterns

[nityasingh07]

Description

Added a test file tests/tests-cube-sdcols.R to verify behavior of cube() when using .SDcols with patterns().

Reproducible Code

library(data.table)

DT <- data.table(grp = c("A","A","B","B"), a1 = 1:4, a2 = 5:8)
cube(DT, .SDcols = patterns("^a"))

Currently returns:

Error in cube.data.table(DT, .SDcols = patterns("^a")) :
  argument "by" is missing, with no default

This suggests that cube() doesn’t support .SDcols or patterns() yet.

System Info

• R version 4.4.1 (Windows 10)
• data.table version 1.17.8

Related Issue

Fixes #7354

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.13%. Comparing base (df7fa80) to head (b942b66).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7410   +/-   ##
=======================================
  Coverage   99.13%   99.13%           
=======================================
  Files          85       85           
  Lines       16618    16618           
=======================================
  Hits        16474    16474           
  Misses        144      144           

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[nityasingh07]

Hello. This is my first contribution to data.table.

I’ve added a small test for cube() support with .SDcols patterns.
Please let me know if any adjustments or additional details are needed.

[tdhock]

please move this test into inst/tests.Rraw

and test the output instead of ignoring the output.

[jangorecki]

Why would we want to have such unit test in the first place? This unit test seems to be not functional because it always succeed and only print console, which is not what unit tests are for.

Isn't it an output of an AI rather than your own contribution?

[jangorecki]

Why do you think that this error message "suggests that cube() doesn’t support .SDcols or patterns() yet." ?