add test action, prevent failure on empty options

.github/workflows/test.yml

@@ -0,0 +1,17 @@
+name: 'build-test'
+on: # rebuild any PRs and main branch changes
+  pull_request:
+  push:
+    branches:
+      - master
+      - 'releases/*'
+
+jobs:
+  test: # make sure the action works on a clean machine without building
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./
+        with:
+          dep: list
+          deployer-version: "7.3.0"

index.js

@@ -109,12 +109,16 @@ async function dep() {
   let ansi = core.getBooleanInput('ansi') ? '--ansi' : '--no-ansi'
   let verbosity = core.getInput('verbosity')
   let options = []
-  try {
-    for (let [key, value] in Object.entries(JSON.parse(core.getInput('options')))) {
-      options.push('-o', `${key}=${value}`)
+  let optionsInput = core.getInput('options');
+
+  if (optionsInput !== '') {
+    try {
+      for (let [key, value] in Object.entries(JSON.parse(optionsInput))) {
+        options.push('-o', `${key}=${value}`)
+      }
+    } catch (e) {
+      throw new Error('Invalid JSON in options')
     }
-  } catch (e) {
-    throw new Error('Invalid JSON in options')
   }
 
   try {