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diff --git a/tests/test-testutil-gloss--load-wiktionary-fixture.el b/tests/test-testutil-gloss--load-wiktionary-fixture.el
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+;;; 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