test(config-utilities): cover with-timer, compile-buffer, summary, info commands

Four new test files extending the existing coverage of
cj/emacs-build--format-build-time. The interactive heavyweights
(cj/recompile-emacs-home, cj/delete-emacs-home-compiled-files,
cj/benchmark-this-method, cj/validate-org-agenda-timestamps) are out
of scope for this pass — each needs an internal/wrapper split first
before tests can exercise the logic without UI.

- with-timer macro: 4 tests asserting it returns the FORMS' value,
  evaluates the body exactly once, emits both announce and done
  messages, and returns the last form when given multiple.
- cj/compile-this-elisp-buffer: 6 tests dispatching across native-async,
  native-sync, and byte-compile fallbacks, plus the not-elisp /
  no-buffer-file-name error paths and the sync-native error catch.
- cj/emacs-build--summary-string: 5 tests asserting the shape of the
  multi-line report (Version, System, Build date, Capabilities section,
  yes/no flag rendering) without locking exact wording.
- info-commands smoke: 5 tests exercising cj/info-emacs-build,
  cj/info-loaded-packages, cj/info-loaded-features, cj/reload-init-file,
  and cj/org-alert-list-timers via boundary-mocked pop-to-buffer and
  load-file, asserting buffer creation, content shape, or echo-area
  message as appropriate.

20 new tests, all passing. Full suite green.

1 files changed, 54 insertions, 0 deletions

diff --git a/tests/test-config-utilities--summary-string.el b/tests/test-config-utilities--summary-string.el
new file mode 100644
index 00000000..cd9ae77a
--- /dev/null
+++ b/tests/test-config-utilities--summary-string.el
@@ -0,0 +1,54 @@
+;;; test-config-utilities--summary-string.el --- Tests for cj/emacs-build--summary-string -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for `cj/emacs-build--summary-string'. The function returns a
+;; multi-line string covering Emacs version, system, build metadata,
+;; and capability flags. Tests assert that key sections are present
+;; without locking to exact wording.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'config-utilities)
+
+(ert-deftest test-config-utilities-summary-string-includes-version-line ()
+  "Normal: summary string includes a Version line with `emacs-version'."
+  (let ((text (cj/emacs-build--summary-string)))
+    (should (string-match-p (regexp-quote (format "Version: %s" emacs-version))
+                            text))))
+
+(ert-deftest test-config-utilities-summary-string-includes-system-line ()
+  "Normal: summary string includes the System: line."
+  (should (string-match-p "^System: " (cj/emacs-build--summary-string))))
+
+(ert-deftest test-config-utilities-summary-string-includes-build-date-line ()
+  "Normal: summary string includes Build date."
+  (should (string-match-p "^Build date: " (cj/emacs-build--summary-string))))
+
+(ert-deftest test-config-utilities-summary-string-includes-capabilities-section ()
+  "Normal: summary string includes the Capabilities section with the
+known capability lines (native compilation, dynamic modules, GnuTLS,
+libxml2, ImageMagick, SQLite)."
+  (let ((text (cj/emacs-build--summary-string)))
+    (should (string-match-p "Capabilities:" text))
+    (dolist (cap '("Native compilation"
+                   "Dynamic modules"
+                   "GnuTLS"
+                   "libxml2"
+                   "ImageMagick"
+                   "SQLite"))
+      (should (string-match-p (regexp-quote cap) text)))))
+
+(ert-deftest test-config-utilities-summary-string-renders-yes-or-no-flags ()
+  "Boundary: each capability line ends in either \"yes\" or \"no\"."
+  (let ((text (cj/emacs-build--summary-string)))
+    (dolist (cap '("Native compilation" "Dynamic modules"
+                   "GnuTLS" "libxml2"
+                   "ImageMagick" "SQLite"))
+      (let ((re (concat "^- " (regexp-quote cap) ": \\(yes\\|no\\)")))
+        (should (string-match-p re text))))))
+
+(provide 'test-config-utilities--summary-string)
+;;; test-config-utilities--summary-string.el ends here