Added tests and makefile (mainly for installing)

Makefile

@@ -0,0 +1,31 @@
+PREFIX=
+
+all:
+	@echo "Nothing to do."
+
+test:
+	@./tests.sh
+
+install:
+	@prefix="$(PREFIX)"; \
+	if [ ! "$$prefix" ]; then \
+		printf '\033[1mWhere do you want to install? (default: /usr/local) \033[0m'; \
+		read prefix; \
+	fi; \
+	[ ! "$$prefix" ] && prefix="/usr/local"; \
+	mkdir -pv -m 755 "$$prefix/share/man/man1" "$$prefix/bin" \
+	&& cp -v trash.1 "$$prefix/share/man/man1/" \
+	&& rm -f "$$prefix/bin/trash" \
+	&& cp -v trash "$$prefix/bin/"
+
+uninstall:
+	@prefix="$(PREFIX)"; \
+	if [ ! "$$prefix" ]; then \
+		printf '\033[1mWhere do you want to uninstall from? (default: /usr/local) \033[0m'; \
+		read prefix; \
+	fi; \
+	[ ! "$$prefix" ] && prefix="/usr/local"; \
+	echo "Deleting..."; \
+	rm -rvf "$$prefix/bin/trash" "$$prefix/share/man/man1/trash.1"
+
+.PHONY: all, test, install, uninstall

tests.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+# Simple test suite
+set -e
+tmp="tests"
+mkdir -p "$tmp"
+trap 'rm -rf "$tmp"' EXIT
+
+testdirs="1.testdir 2.testdir 3.testdir 4.testdir"
+testfiles="1.testfile 2.testfile 3.testfile"
+for d in $testdirs; do
+  mkdir -p "$tmp/$d"
+  for f in $testfiles; do touch "$tmp/$d/$f"; done
+done
+
+./trash -v "$tmp/1.testdir/1.testfile" "$tmp/1.testdir/2.testfile" "$tmp/2.testdir" "$tmp/3.testdir"
+./trash -vfu 1.testfile
+./trash -vfu 2.testdir
+
+  [ -e "$tmp/1.testdir/1.testfile" ]
+! [ -e "$tmp/1.testdir/2.testfile" ]
+  [ -e "$tmp/1.testdir/3.testfile" ]
+  [ -e "$tmp/2.testdir" ]
+  [ -e "$tmp/2.testdir/1.testfile" ]
+! [ -e "$tmp/3.testdir" ]
+  [ -e "$tmp/4.testdir" ]
+
+echo "Tests passed!"