feat: add possible testing framework for harpoon

makefile

@@ -5,3 +5,16 @@ install: ./harpoon
 
 uninstall:
 	@rm $(INSTALL_PATH)
+
+test: docker
+	@docker run -h harpoon-test --name harpoon-test harpoon-test
+
+docker: test/Dockerfile harpoon test/driver.sh --clean
+	@docker build -t harpoon-test -f test/Dockerfile .
+
+--clean:
+	@docker ps -a --format '{{.Image}}' | grep -w "harpoon-test" \
+		| xargs -I {} docker rm {} >/dev/null 2>&1 || :;
+	@docker images -a --format '{{.Repository}}' | grep -w "harpoon-test" \
+		| xargs -I {} docker rmi {} >/dev/null 2>&1 || :;
+

test/Dockerfile

@@ -0,0 +1,15 @@
+FROM ubuntu:latest
+
+WORKDIR /root
+
+RUN apt update -yq && apt install -yq tmux curl wget git && cd \
+    && git clone https://github.com/junegunn/fzf.git --depth 1
+RUN cd /root/fzf && ./install --all
+RUN apt-get clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /var/log/dmesg.* && \
+    cat /dev/null > /var/log/dmesg
+
+COPY ./harpoon /bin/harpoon
+COPY ./test/driver.sh  /bin/driver
+
+ENTRYPOINT [ "driver" ]

test/driver.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+! type harpoon >/dev/null && echo "Could not find harpoon" && exit 1
+
+setup() {
+	mkdir /root/.cache
+	TERM="${TERM:-screen256color}"
+	tmux new -ds home
+	cachefile=/root/.cache/.tmux-harpoon-sessions
+	harpoon -h >/dev/null
+}
+
+failed() {
+	echo "$LINENO Failed"
+	exit 1
+}
+
+setup
+
+! [ "$(cat "$cachefile")" = "" ] && failed
+echo pass
+
+tmux ls
+tmux -V
+tmux send-keys -t "home" Enter "harpoon -a" Enter
+sleep 1
+
+! [ "$(cat "$cachefile")" = "home=/root" ] && failed
+echo "pass"