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diff --git a/tests/test-gloss-core--find-buffer-position.el b/tests/test-gloss-core--find-buffer-position.el
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+;;; test-gloss-core--find-buffer-position.el --- Tests for gloss-core-find-buffer-position -*- lexical-binding: t -*-
+
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+;;; Commentary:
+;; Tests for `gloss-core-find-buffer-position' covering N/B/E cases.
+
+;;; Code:
+
+(require 'ert)
+(require 'gloss-core)
+(require 'testutil-gloss)
+
+(ert-deftest test-gloss-core-find-buffer-position-existing-term-returns-marker ()
+  "Normal: returns a marker pointing at the term's heading."
+  (gloss-test--with-temp-glossary gloss-test--sample-content
+    (let ((marker (gloss-core-find-buffer-position "anaphora")))
+      (should (markerp marker))
+      (with-current-buffer (marker-buffer marker)
+        (goto-char marker)
+        (should (looking-at-p "^\\* anaphora"))))))
+
+(ert-deftest test-gloss-core-find-buffer-position-second-term-returns-marker ()
+  "Normal: marker for second term points at its heading, not the first."
+  (gloss-test--with-temp-glossary gloss-test--sample-content
+    (let ((marker (gloss-core-find-buffer-position "SBIR")))
+      (should (markerp marker))
+      (with-current-buffer (marker-buffer marker)
+        (goto-char marker)
+        (should (looking-at-p "^\\* SBIR"))))))
+
+(ert-deftest test-gloss-core-find-buffer-position-missing-term-returns-nil ()
+  "Boundary: returns nil for a term not in the glossary."
+  (gloss-test--with-temp-glossary gloss-test--sample-content
+    (should-not (gloss-core-find-buffer-position "nonexistent"))))
+
+(ert-deftest test-gloss-core-find-buffer-position-missing-file-returns-nil ()
+  "Error: returns nil when the file does not exist."
+  (let ((gloss-file (concat temporary-file-directory "gloss-pos-nonexistent-"
+                            (number-to-string (random 100000)) ".org")))
+    (unwind-protect
+        (progn
+          (gloss-core--cache-reset)
+          (should-not (gloss-core-find-buffer-position "any")))
+      (gloss-core--cache-reset)
+      (when (file-exists-p gloss-file) (delete-file gloss-file)))))
+
+(provide 'test-gloss-core--find-buffer-position)
+;;; test-gloss-core--find-buffer-position.el ends here