test: add cluster equivalence tests for tidy/glance.fixest

[LeonidasZhak]

Summary

Adds tests verifying that tidy(fit, cluster=...) and glance(fit, cluster=...) produce the same results as tidying/summarizing a pre-clustered summary.fixest object.

Problem

The existing test-fixest.R tests tidy() and glance() with se = "hetero" equivalence against a pre-summarized object, but the same pattern was not tested for the cluster argument. This means the cluster-pass-through behavior of both tidy.fixest and glance.fixest was untested.

Fix

Added a test block inside the existing "tidiers work with model results or summary of model results" test that:

• Creates a pre-clustered summary: summary(fit2, cluster = c("id", "v1"))
• Verifies tidy(fit2, cluster = ...) matches tidy(fit2_clust)
• Verifies tidy(fit2, cluster = ..., conf.int = TRUE) matches
• Verifies glance(fit2, cluster = ...) matches glance(fit2_clust)

Relation to PR #1276

PR #1276 added dedicated test blocks for the cluster and vcov arguments on tidy.fixest. This PR adds the missing glance.fixest cluster equivalence test. The two PRs are complementary and do not conflict.

Validation

• New equivalence assertions pass (verified locally with R 4.5.2)
• No existing tests broken

Files changed

• tests/testthat/test-fixest.R — 9 lines added

[LeonidasZhak]

Withdrawing this small automated PR while I consolidate an oversized batch of contributions and reduce maintainer review burden. Sorry for the noise, and thank you for maintaining the project.