Enable removing plugins via CLI executable

tests/test_plugin_clean.sh

@@ -14,16 +14,49 @@ manually_install_the_plugin() {
 	git clone --quiet https://github.com/tmux-plugins/tmux-example-plugin
 }
 
-test_plugin_uninstallation() {
+# TMUX KEY-BINDING TESTS
+
+test_plugin_uninstallation_via_tmux_key_binding() {
 	set_tmux_conf_helper <<- HERE
 	run-shell "$TPM_DIR/tpm"
 	HERE
 
 	manually_install_the_plugin
 
-	# opens tmux and test it with `expect`
 	"$CURRENT_DIR/expect_successful_clean_plugins" ||
-		fail_helper "Clean fails"
+		fail_helper "[key-binding] clean fails"
+
+	teardown_helper
+}
+
+# SCRIPT TESTS
+
+test_plugin_uninstallation_via_script() {
+	set_tmux_conf_helper <<- HERE
+	run-shell "$TPM_DIR/tpm"
+	HERE
+
+	manually_install_the_plugin
+
+	script_run_helper "$TPM_DIR/bin/clean_plugins" '"tmux-example-plugin" clean success' ||
+		fail_helper "[script] plugin cleaning fails"
+
+	teardown_helper
+}
+
+test_unsuccessful_plugin_uninstallation_via_script() {
+	set_tmux_conf_helper <<- HERE
+	run-shell "$TPM_DIR/tpm"
+	HERE
+
+	manually_install_the_plugin
+	chmod 000 "$PLUGINS_DIR/tmux-example-plugin" # disable directory deletion
+
+	local expected_exit_code=1
+	script_run_helper "$TPM_DIR/bin/clean_plugins" '"tmux-example-plugin" clean fail' "$expected_exit_code" ||
+		fail_helper "[script] unsuccessful plugin cleaning doesn't fail"
+
+	chmod 755 "$PLUGINS_DIR/tmux-example-plugin" # enable directory deletion
 
 	teardown_helper
 }