diff --git a/Makefile b/Makefile
index da148e75..bb837709 100644
--- a/Makefile
+++ b/Makefile
@@ -37,6 +37,7 @@ dev:
 # for an example of using a script like this with the 'git bisect run'
 # command.
 test: clean all
+	touch tests/project/1/.git
 	$(EMACS) -Q -batch -L . -l tests/php-mode-test.el -f ert-run-tests-batch-and-exit
 
 .PHONY: all autoloads clean test
diff --git a/tests/php-mode-test.el b/tests/php-mode-test.el
index 0ef1021d..431998fd 100644
--- a/tests/php-mode-test.el
+++ b/tests/php-mode-test.el
@@ -134,6 +134,8 @@ file name and check that the faces of the fonts in the buffer match."
   `(with-temp-buffer
      (setq php-mode-enable-backup-style-variables nil)
      (insert-file-contents (expand-file-name ,file php-mode-test-dir))
+     (setq default-directory
+           (expand-file-name ".." (expand-file-name ,file php-mode-test-dir)))
      (php-mode)
      ,(if (fboundp 'font-lock-ensure)
           '(font-lock-ensure)
@@ -635,8 +637,12 @@ as a keyword."
     (should (eq 0 (- (point-max) (point-min))))))
 
 (ert-deftest php-project-root ()
-  (should (string= (abbreviate-file-name default-directory)
-                   (php-project-get-root-dir))))
+  "Test for detection `php-project-root' by directory."
+  (dolist (root (mapcar #'car php-project-available-root-files))
+    (with-php-mode-test ("project/1/src/functions.php")
+      (let ((php-project-root root))
+        (should (string= (expand-file-name "project/1/" php-mode-test-dir)
+                         (expand-file-name (php-project-get-root-dir))))))))
 
 (defun php-mode-test-in-function-p (&optional pos)
   "Determine whether POS is inside a function.
diff --git a/tests/project/1/.editorconfig b/tests/project/1/.editorconfig
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/project/1/.hg b/tests/project/1/.hg
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/project/1/.projectile b/tests/project/1/.projectile
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/project/1/.svn b/tests/project/1/.svn
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/project/1/composer.json b/tests/project/1/composer.json
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/project/1/src/functions.php b/tests/project/1/src/functions.php
new file mode 100644
index 00000000..b3d9bbc7
--- /dev/null
+++ b/tests/project/1/src/functions.php
@@ -0,0 +1 @@
+<?php