When Hugo seems to disappear, just reinstall and then continue normally (#82)

should fix #81 (or at least mitigate it)

test/index.spec.js

@@ -1,12 +1,33 @@
 /* eslint-env node, mocha */
+import path from "path";
 import { execFile } from "child_process";
 import assert from "assert";
+import del from "del";
 import hugo from "../index.js";
+import { getBinPath } from "../lib/utils.js";
 
 it("Hugo exists and runs?", async function () {
   this.timeout(30000); // increase timeout to an excessive 30 seconds for CI
 
-  assert(execFile(hugo, ["env"], function (error, stdout) {
+  const hugoPath = await hugo();
+
+  assert(execFile(hugoPath, ["env"], function (error, stdout) {
+    if (error) {
+      throw error;
+    }
+    console.log(stdout);
+  }));
+});
+
+it("Hugo doesn't exist, install it instead of throwing an error", async function () {
+  this.timeout(30000); // increase timeout to an excessive 30 seconds for CI
+
+  // delete binary to ensure it's auto-reinstalled
+  await del(path.dirname(getBinPath()));
+
+  const hugoPath = await hugo();
+
+  assert(execFile(hugoPath, ["version"], function (error, stdout) {
     if (error) {
       throw error;
     }