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diff --git a/test/lisp/progmodes/xref-tests.el b/test/lisp/progmodes/xref-tests.el
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+++ b/test/lisp/progmodes/xref-tests.el
@@ -0,0 +1,91 @@
+;;; xref-tests.el --- tests for xref
+
+;; Copyright (C) 2016 Free Software Foundation, Inc.
+
+;; Author: Dmitry Gutov <dgutov@yandex.ru>
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'xref)
+(require 'cl-lib)
+
+(defvar xref-tests-data-dir
+  (expand-file-name "data/xref/"
+                    (getenv "EMACS_TEST_DIRECTORY")))
+
+(ert-deftest xref-collect-matches-finds-none-for-some-regexp ()
+  (should (null (xref-collect-matches "zzz" "*" xref-tests-data-dir nil))))
+
+(ert-deftest xref-collect-matches-finds-some-for-bar ()
+  (let* ((matches (xref-collect-matches "bar" "*" xref-tests-data-dir nil))
+         (locs (cl-sort (mapcar #'xref-item-location matches)
+                        #'string<
+                        :key #'xref-location-group)))
+    (should (= 2 (length matches)))
+    (should (string-match-p "file1\\.txt\\'" (xref-location-group (nth 0 locs))))
+    (should (string-match-p "file2\\.txt\\'" (xref-location-group (nth 1 locs))))))
+
+(ert-deftest xref-collect-matches-finds-two-matches-on-the-same-line ()
+  (let* ((matches (xref-collect-matches "foo" "*" xref-tests-data-dir nil))
+         (locs (mapcar #'xref-item-location matches)))
+    (should (= 2 (length matches)))
+    (should (string-match-p "file1\\.txt\\'" (xref-location-group (nth 0 locs))))
+    (should (string-match-p "file1\\.txt\\'" (xref-location-group (nth 1 locs))))
+    (should (equal 1 (xref-location-line (nth 0 locs))))
+    (should (equal 1 (xref-location-line (nth 1 locs))))
+    (should (equal 0 (xref-file-location-column (nth 0 locs))))
+    (should (equal 4 (xref-file-location-column (nth 1 locs))))))
+
+(ert-deftest xref-collect-matches-finds-an-empty-line-regexp-match ()
+  (let* ((matches (xref-collect-matches "^$" "*" xref-tests-data-dir nil))
+         (locs (mapcar #'xref-item-location matches)))
+    (should (= 1 (length matches)))
+    (should (string-match-p "file2\\.txt\\'" (xref-location-group (nth 0 locs))))
+    (should (equal 1 (xref-location-line (nth 0 locs))))
+    (should (equal 0 (xref-file-location-column (nth 0 locs))))))
+
+(ert-deftest xref--buf-pairs-iterator-groups-markers-by-buffers-1 ()
+  (let* ((xrefs (xref-collect-matches "foo" "*" xref-tests-data-dir nil))
+         (iter (xref--buf-pairs-iterator xrefs))
+         (cons (funcall iter :next)))
+    (should (null (funcall iter :next)))
+    (should (string-match "file1\\.txt\\'" (buffer-file-name (car cons))))
+    (should (= 2 (length (cdr cons))))))
+
+(ert-deftest xref--buf-pairs-iterator-groups-markers-by-buffers-2 ()
+  (let* ((xrefs (xref-collect-matches "bar" "*" xref-tests-data-dir nil))
+         (iter (xref--buf-pairs-iterator xrefs))
+         (cons1 (funcall iter :next))
+         (cons2 (funcall iter :next)))
+    (should (null (funcall iter :next)))
+    (should-not (equal (car cons1) (car cons2)))
+    (should (= 1 (length (cdr cons1))))
+    (should (= 1 (length (cdr cons2))))))
+
+(ert-deftest xref--buf-pairs-iterator-cleans-up-markers ()
+  (let* ((xrefs (xref-collect-matches "bar" "*" xref-tests-data-dir nil))
+         (iter (xref--buf-pairs-iterator xrefs))
+         (cons1 (funcall iter :next))
+         (cons2 (funcall iter :next)))
+    (funcall iter :cleanup)
+    (should (null (marker-position (car (nth 0 (cdr cons1))))))
+    (should (null (marker-position (cdr (nth 0 (cdr cons1))))))
+    (should (null (marker-position (car (nth 0 (cdr cons2))))))
+    (should (null (marker-position (cdr (nth 0 (cdr cons2))))))))