Add BATS test setup

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  bats:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install bats-core
+        run: |
+          git clone --depth 1 https://github.com/bats-core/bats-core.git /tmp/bats-core
+          echo "/tmp/bats-core/bin" >> "$GITHUB_PATH"
+      - name: Run tests
+        run: make test

.travis.yml

@@ -0,0 +1,8 @@
+language: bash
+
+install:
+  - git clone --depth 1 https://github.com/bats-core/bats-core.git /tmp/bats-core
+  - export PATH="/tmp/bats-core/bin:$PATH"
+
+script:
+  - make test

Makefile

@@ -2,12 +2,17 @@ BIN ?= node-reinstall
 PREFIX ?= /usr/local
 USAGE ?= $$(./node-reinstall -h | grep "Usage:")
 
+.PHONY: install uninstall test readme
+
 install:
 	cp node-reinstall $(PREFIX)/bin/$(BIN)
 
 uninstall:
 	rm -f $(PREFIX)/bin/$(BIN)
 
+test:
+	bats test
+
 readme:
 	perl -pi -w -e "s/Usage:.*/$(USAGE)/" README.md
 	sed '/Commands/,$$ d' README.md > changes.md

README.md

@@ -82,6 +82,16 @@ With `node-reinstall` in your [$PATH](http://en.wikipedia.org/wiki/PATH_%28varia
 node-reinstall
 ```
 
+## Tests
+
+Run the BATS test suite with:
+
+```
+make test
+```
+
+The tests cover safe command-line paths that exit before any destructive reinstall operations run, plus stubbed reinstall flows that run against temporary `HOME` and `PREFIX` paths.
+
 
 ## Usage
 

test/node-reinstall.bats

@@ -0,0 +1,133 @@
+#!/usr/bin/env bats
+
+setup() {
+  export SCRIPT="$BATS_TEST_DIRNAME/../node-reinstall"
+  export TEST_ROOT="$BATS_TEST_TMPDIR/node-reinstall"
+  export HOME="$TEST_ROOT/home"
+  export PREFIX="$TEST_ROOT/prefix"
+  export STUB_BIN="$TEST_ROOT/bin"
+  export STUB_LOG="$TEST_ROOT/commands.log"
+
+  mkdir -p "$HOME" "$PREFIX/bin" "$STUB_BIN"
+  export PATH="$STUB_BIN:/usr/bin:/bin:$PREFIX/bin"
+}
+
+make_stub() {
+  local name="$1"
+  local body="$2"
+
+  printf '#!/usr/bin/env bash\n%s\n' "$body" > "$STUB_BIN/$name"
+  chmod +x "$STUB_BIN/$name"
+}
+
+stub_sudo() {
+  make_stub sudo 'echo "sudo $*" >> "$STUB_LOG"; exit 0'
+}
+
+stub_curl_for_nvm() {
+  make_stub curl '
+echo "curl $*" >> "$STUB_LOG"
+for arg in "$@"; do
+  if [[ "$arg" == "-o" ]]; then
+    write_next=1
+    continue
+  fi
+  if [[ -n "${write_next:-}" ]]; then
+    printf "%s\n" "#!/usr/bin/env bash" "echo \"nave \$*\" >> \"\$STUB_LOG\"" > "$arg"
+    chmod +x "$arg"
+    exit 0
+  fi
+done
+case "$*" in
+  *releases/latest*) printf "%s\n" "{\"tag_name\":\"v0.40.3\"}" ;;
+  *) printf "%s\n" "# nvm install script stub" ;;
+esac
+'
+}
+
+stub_nvm() {
+  make_stub nvm 'echo "nvm $*" >> "$STUB_LOG"; exit 0'
+}
+
+stub_absent_node() {
+  make_stub node 'exit 127'
+}
+
+stub_installed_node() {
+  make_stub node 'printf "%s\n" "v16.20.2"'
+}
+
+stub_npm_with_globals() {
+  make_stub npm '
+echo "npm $*" >> "$STUB_LOG"
+if [[ "$*" == "-g list --depth 0 --parseable" ]]; then
+  printf "%s\n" "/usr/local/lib" "/usr/local/lib/npm" "/usr/local/lib/eslint" "/usr/local/lib/prettier"
+  exit 0
+fi
+exit 0
+'
+}
+
+@test "script has valid bash syntax" {
+  run bash -n "$SCRIPT"
+
+  [ "$status" -eq 0 ]
+}
+
+@test "--help prints usage and exits before privileged operations" {
+  run "$SCRIPT" --help
+
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"Usage:"* ]]
+  [[ "$output" == *"--nvm-latest"* ]]
+  [[ "$output" != *"sudo"* ]]
+}
+
+@test "-v prints the package version" {
+  run "$SCRIPT" -v
+
+  [ "$status" -eq 0 ]
+  [ "$output" = "0.0.17" ]
+}
+
+@test "unknown options fail with usage output" {
+  run "$SCRIPT" --not-a-real-option
+
+  [ "$status" -eq 1 ]
+  [[ "$output" == *"Unknown option"* ]]
+  [[ "$output" == *"Usage:"* ]]
+}
+
+@test "--force --nvm installs the default version when node and npm are absent" {
+  stub_sudo
+  stub_curl_for_nvm
+  stub_nvm
+  stub_absent_node
+
+  run "$SCRIPT" --force --nvm
+
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"Installing Node, npm."* ]]
+  [[ "$output" == *"node-reinstall is done."* ]]
+  grep -q "sudo -v" "$STUB_LOG"
+  grep -q "nvm install 5" "$STUB_LOG"
+  grep -q "nvm alias default 5" "$STUB_LOG"
+}
+
+@test "--force --nave uses the requested node version without prompting" {
+  stub_sudo
+  stub_curl_for_nvm
+  stub_installed_node
+  stub_npm_with_globals
+
+  run "$SCRIPT" --force --nave 18.20.4
+
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"Found Node.js version v16.20.2 already installed."* ]]
+  [[ "$output" == *"Completely reinstalling Node, npm."* ]]
+  [[ "$output" == *"Reinstalling your global npm modules:"* ]]
+  grep -q "sudo -v" "$STUB_LOG"
+  grep -q "curl .*nave.sh.* -o $PREFIX/bin/nave" "$STUB_LOG"
+  grep -q "nave usemain 18.20.4" "$STUB_LOG"
+  grep -q "npm install --global eslint prettier" "$STUB_LOG"
+}