feat: installFromDesc fails if description_file or destination_folder…

… do not exists

src/install.js

@@ -63,6 +63,18 @@ const installFromDesc = async function (
   with_exit = true
 ){
 
+  // fails if description_file does not exist
+  if (!fs.existsSync(description_file)) {
+    console.error(`❌ {${description_file}} does not exist.`)
+    return false
+  }
+
+  // fails if destination_folder does not exist
+  if (!fs.existsSync(destination_folder)) {
+    console.error(`❌ {${destination_folder}} does not exist.`)
+    return false
+  }
+
   const webR = new WebR();
 
   await webR.init();

tests/install.test.js

@@ -78,8 +78,17 @@ test('installFromDesc works', async () => {
       { recursive: true, force: true }
     )
   };
+
   const DESCRIPTION = path.join(__dirname, "./", "DESCRIPTION");
 
+  const package_not_installed = await installFromDesc(DESCRIPTION, temp_dir, with_exit = false);
+
+  expect(
+    package_not_installed
+  ).toBe(false);
+
+  fs.mkdirSync(temp_dir);
+
   await installFromDesc(DESCRIPTION, temp_dir, with_exit = false);
 
   expect(