tests: rename files (00x-*.t is basic stuff, >=100-*.t are tests using IPC)

testcases/t/003-ipc.t

@@ -0,0 +1,26 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+
+use i3test;
+
+my $x = X11::XCB::Connection->new;
+
+fresh_workspace;
+
+#####################################################################
+# Ensure IPC works by switching workspaces
+#####################################################################
+
+# Create a window so we can get a focus different from NULL
+my $window = open_window($x);
+
+my $focus = $x->input_focus;
+
+# Switch to another workspace
+fresh_workspace;
+
+sync_with_i3($x);
+my $new_focus = $x->input_focus;
+isnt($focus, $new_focus, "Focus changed");
+
+done_testing;