test: add gloss secondary commands test suite (red phase)

Six test files for the remaining stub commands. All 14 tests fail at
this commit because the implementations are stubs.

`gloss--add-finish-internal' (the pure save side of `gloss-add') gets
N/B/E coverage on validation and the persistence side effect.
`gloss--stats-text' (the pure stats string formatter) covers empty,
populated, and missing-file cases. The interactive commands
(`gloss-edit', `gloss-list-terms', `gloss-reload', `gloss-drill-export')
get smoke tests only — the design treats them as mode-glue with 70%
coverage targets, since prompts and `switch-to-buffer' are framework
behaviour Emacs already tests.

Two error-path tests assert the message contains a specific substring,
not just that `user-error' was raised. The stubs raise `user-error' too,
so a bare `should-error' would pass for the wrong reason. The substring
check anchors red against the real error path.

1 files changed, 40 insertions, 0 deletions

diff --git a/tests/test-gloss--stats-text.el b/tests/test-gloss--stats-text.el
new file mode 100644
index 0000000..32093b1
--- /dev/null
+++ b/tests/test-gloss--stats-text.el
@@ -0,0 +1,40 @@
+;;; test-gloss--stats-text.el --- Tests for gloss--stats-text -*- lexical-binding: t -*-
+
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+;;; Commentary:
+;; Tests for the pure helper `gloss--stats-text' which formats a
+;; multi-line stats summary. Drill-tagged count walks the org file via
+;; the same primitives as `gloss-drill', so this also indirectly
+;; exercises that integration.
+
+;;; Code:
+
+(require 'ert)
+(require 'gloss)
+(require 'testutil-gloss)
+
+(ert-deftest test-gloss-stats-text-empty-glossary-reports-zero ()
+  "Boundary: empty glossary file reports zero terms."
+  (gloss-test--with-temp-glossary "#+TITLE: Glossary\n#+STARTUP: showall\n"
+    (let ((text (gloss--stats-text)))
+      (should (string-match-p "Total terms: +0" text))
+      (should (string-match-p "Drill-tagged: +0" text)))))
+
+(ert-deftest test-gloss-stats-text-populated-glossary-counts-terms ()
+  "Normal: populated glossary reports total terms and source breakdown."
+  (gloss-test--with-temp-glossary gloss-test--sample-content
+    (let ((text (gloss--stats-text)))
+      (should (string-match-p "Total terms: +2" text))
+      (should (string-match-p "wiktionary=2" text))
+      (should (string-match-p "File size:" text))
+      (should (string-match-p "Cache mtime:" text)))))
+
+(ert-deftest test-gloss-stats-text-missing-file-reports-zero-and-never ()
+  "Error: missing glossary file reports zero terms and \"never\" mtime."
+  (gloss-test--with-missing-glossary
+    (let ((text (gloss--stats-text)))
+      (should (string-match-p "Total terms: +0" text)))))
+
+(provide 'test-gloss--stats-text)
+;;; test-gloss--stats-text.el ends here