added the new tests to main run

app/test/Makefile

@@ -626,7 +626,7 @@ test-sheet-cleanup:
 	@rm -f tmux-*.log
 	@tmux kill-server || printf ''
 
-test-sheet-all: test-sheet-1 test-sheet-2 test-sheet-3 test-sheet-4 test-sheet-5 test-sheet-6 test-sheet-7 test-sheet-8 test-sheet-9 test-sheet-10 test-sheet-11 test-sheet-12 test-sheet-13 test-sheet-14 test-sheet-subcommand test-sheet-prop-cmd-opt
+test-sheet-all: test-sheet-1 test-sheet-2 test-sheet-3 test-sheet-4 test-sheet-5 test-sheet-6 test-sheet-7 test-sheet-8 test-sheet-9 test-sheet-10 test-sheet-11 test-sheet-12 test-sheet-13 test-sheet-14 test-sheet-subcommand test-sheet-prop-cmd-opt test-sheet-example-extension
 	@(for SESSION in $^; do ! tmux kill-session -t "$$SESSION" 2>/dev/null; done && ${TEST_PASS} || ${TEST_FAIL})
 
 TMUX_TERM=xterm-256color