Add a test for the global debounce

test/spawn/debounce-multi-file.js

@@ -0,0 +1,25 @@
+const tap = require('tap');
+
+const { spawn, touchFile } = require('../utils');
+
+tap.test('should reset debounce timer if a different file changes', t => {
+  spawn('--debounce=1000 --interval=50 server.js', out => {
+    if (out.match(/touch message.js/)) {
+      const ts = Date.now();
+      touchFile('server.js');
+      for (let i = 0; i <= 2000; i += 500) {
+        setTimeout(() => {
+          touchFile('message.js');
+        }, i);
+      }
+      return out2 => {
+        if (out2.match(/Restarting/)) {
+          if (Date.now() - ts < 2500) {
+            t.fail('Debounce logic did not wait 200 ms after the second change.');
+          }
+          return { exit: t.end.bind(t) };
+        }
+      };
+    }
+  });
+});