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diff --git a/tests/test-gloss-fetch--definitions-500-returns-server-error.el b/tests/test-gloss-fetch--definitions-500-returns-server-error.el
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+;;; test-gloss-fetch--definitions-500-returns-server-error.el --- 5xx path -*- lexical-binding: t -*-
+
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+;;; Commentary:
+;; HTTP 5xx, malformed JSON, schema mismatch, and 4xx other than 404/429
+;; all roll up to :server-error.  When every source fails this way, the
+;; user-facing rollup is :empty with the source listed under :failed.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(require 'gloss-fetch)
+(require 'testutil-gloss-fetch)
+
+(ert-deftest test-gloss-fetch-definitions-500-rolls-up-to-failed ()
+  "Normal: HTTP 500 maps the source to :server-error (in :failed)."
+  (gloss-fetch-test--with-mocked-url
+      (lambda (_url)
+        (gloss-fetch-test--status-response "HTTP/1.1 500 Internal Server Error"
+                                           "Server is sad."))
+    (let ((result (gloss-fetch-definitions "anaphora")))
+      (should (eq (car result) :empty))
+      (should (member 'wiktionary (plist-get result :failed)))
+      (should-not (plist-get result :no-defs)))))
+
+(ert-deftest test-gloss-fetch-definitions-503-rolls-up-to-failed ()
+  "Normal: HTTP 503 maps the source to :server-error (in :failed)."
+  (gloss-fetch-test--with-mocked-url
+      (lambda (_url)
+        (gloss-fetch-test--status-response "HTTP/1.1 503 Service Unavailable" ""))
+    (let ((result (gloss-fetch-definitions "anaphora")))
+      (should (eq (car result) :empty))
+      (should (member 'wiktionary (plist-get result :failed))))))
+
+(ert-deftest test-gloss-fetch-definitions-malformed-json-rolls-up-to-failed ()
+  "Boundary: a 200 with non-JSON body also maps to :server-error."
+  (gloss-fetch-test--with-mocked-url
+      (lambda (_url) (gloss-fetch-test--ok-response "<html>not json</html>"))
+    (let ((result (gloss-fetch-definitions "anaphora")))
+      (should (eq (car result) :empty))
+      (should (member 'wiktionary (plist-get result :failed))))))
+
+(ert-deftest test-gloss-fetch-definitions-400-rolls-up-to-failed ()
+  "Error: HTTP 400 (4xx other than 404/429) maps to :server-error (in :failed)."
+  (gloss-fetch-test--with-mocked-url
+      (lambda (_url)
+        (gloss-fetch-test--status-response "HTTP/1.1 400 Bad Request" ""))
+    (let ((result (gloss-fetch-definitions "anaphora")))
+      (should (eq (car result) :empty))
+      (should (member 'wiktionary (plist-get result :failed))))))
+
+(provide 'test-gloss-fetch--definitions-500-returns-server-error)
+;;; test-gloss-fetch--definitions-500-returns-server-error.el ends here