diff --git a/testcases/t/293-focus-follows-mouse.t b/testcases/t/293-focus-follows-mouse.t
new file mode 100644
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--- /dev/null
+++ b/testcases/t/293-focus-follows-mouse.t
@@ -0,0 +1,60 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Please read the following documents before working on tests:
+# • https://build.i3wm.org/docs/testsuite.html
+#   (or docs/testsuite)
+#
+# • https://build.i3wm.org/docs/lib-i3test.html
+#   (alternatively: perldoc ./testcases/lib/i3test.pm)
+#
+# • https://build.i3wm.org/docs/ipc.html
+#   (or docs/ipc)
+#
+# • http://onyxneon.com/books/modern_perl/modern_perl_a4.pdf
+#   (unless you are already familiar with Perl)
+#
+# Tests the focus_follows_mouse setting.
+use i3test i3_config => <<EOT;
+# i3 config file (v4)
+font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
+
+fake-outputs 1000x1000+0+0
+EOT
+
+my ($first, $second);
+
+sub synced_warp_pointer {
+    my ($x_px, $y_px) = @_;
+    sync_with_i3;
+    $x->root->warp_pointer($x_px, $y_px);
+    sync_with_i3;
+}
+
+###################################################################
+# Test a simple case with 2 windows.
+###################################################################
+
+synced_warp_pointer(600, 600);
+$first = open_window;
+$second = open_window;
+is($x->input_focus, $second->id, 'second window focused');
+
+synced_warp_pointer(0, 0);
+is($x->input_focus, $first->id, 'first window focused');
+
+###################################################################
+# Test that focus isn't changed with tabbed windows.
+###################################################################
+
+fresh_workspace;
+synced_warp_pointer(600, 600);
+$first = open_window;
+cmd 'layout tabbed';
+$second = open_window;
+is($x->input_focus, $second->id, 'second (tabbed) window focused');
+
+synced_warp_pointer(0, 0);
+is($x->input_focus, $second->id, 'second window still focused');
+
+done_testing;