test: add Wiktionary fixture loader helper

Append `gloss-test--load-wiktionary-fixture' to tests/testutil-gloss.el. It takes a fixture name (e.g. "anaphora") and returns the raw JSON body from tests/fixtures/wiktionary-NAME.json, or signals `error' with the full path when the file isn't there. The helper resolves the fixtures directory from a `defconst' captured at load time. That way it works the same whether a test file requires testutil-gloss directly or pulls it in transitively through `make test'.

Three ERT cases under tests/test-testutil-gloss--load-wiktionary-fixture.el cover Normal (anaphora loads as a non-empty JSON string), Boundary (the smallest fixture, 404, loads), and Error (a missing fixture raises with the path embedded in the message).

Verified with `make test': 35 passed, 0 unexpected.

2 files changed, 54 insertions, 0 deletions

diff --git a/tests/test-testutil-gloss--load-wiktionary-fixture.el b/tests/test-testutil-gloss--load-wiktionary-fixture.el
new file mode 100644
index 0000000..daf24af
--- /dev/null
+++ b/tests/test-testutil-gloss--load-wiktionary-fixture.el
@@ -0,0 +1,37 @@
+;;; test-testutil-gloss--load-wiktionary-fixture.el --- Tests for fixture loader -*- lexical-binding: t -*-
+
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+;;; Commentary:
+;; Tests for `gloss-test--load-wiktionary-fixture' covering
+;; Normal/Boundary/Error cases.
+
+;;; Code:
+
+(require 'ert)
+(require 'testutil-gloss)
+
+(ert-deftest test-testutil-gloss-load-wiktionary-fixture-existing-returns-string ()
+  "Normal: an existing fixture loads as a non-empty JSON string."
+  (let ((body (gloss-test--load-wiktionary-fixture "anaphora")))
+    (should (stringp body))
+    (should (> (length body) 0))
+    (should (string-prefix-p "{" body))))
+
+(ert-deftest test-testutil-gloss-load-wiktionary-fixture-smallest-fixture-loads ()
+  "Boundary: the 404 error-body fixture (smallest) loads as a string."
+  (let ((body (gloss-test--load-wiktionary-fixture "404")))
+    (should (stringp body))
+    (should (> (length body) 0))
+    (should (string-match-p "404" body))))
+
+(ert-deftest test-testutil-gloss-load-wiktionary-fixture-missing-raises-error ()
+  "Error: a missing fixture signals `error' with the path in the message."
+  (let* ((name "does-not-exist-xyzzy")
+         (err (should-error (gloss-test--load-wiktionary-fixture name)
+                            :type 'error)))
+    (should (string-match-p (format "wiktionary-%s\\.json" name)
+                            (error-message-string err)))))
+
+(provide 'test-testutil-gloss--load-wiktionary-fixture)
+;;; test-testutil-gloss--load-wiktionary-fixture.el ends here
diff --git a/tests/testutil-gloss.el b/tests/testutil-gloss.el
index 7510765..36ba7ef 100644
--- a/tests/testutil-gloss.el
+++ b/tests/testutil-gloss.el
@@ -76,5 +76,22 @@ any visiting buffer if BODY created them."
        (when (file-exists-p gloss-file)
          (delete-file gloss-file)))))
 
+(defconst gloss-test--testutil-dir
+  (file-name-directory (or load-file-name buffer-file-name default-directory))
+  "Directory of this testutil file; used to locate fixtures.")
+
+(defun gloss-test--load-wiktionary-fixture (name)
+  "Return the raw JSON body of fixture `wiktionary-NAME.json' as a string.
+NAME is the fixture name without the `wiktionary-' prefix or `.json'
+suffix (e.g. \"anaphora\").  Fixtures live in tests/fixtures/ alongside
+this file.  Signal `error' with the full path if the file is missing."
+  (let ((path (expand-file-name (format "fixtures/wiktionary-%s.json" name)
+                                gloss-test--testutil-dir)))
+    (unless (file-exists-p path)
+      (error "Wiktionary fixture not found: %s" path))
+    (with-temp-buffer
+      (insert-file-contents path)
+      (buffer-string))))
+
 (provide 'testutil-gloss)
 ;;; testutil-gloss.el ends here