Index: node_modules/pstree.remy/tests/index.test.js
===================================================================
--- node_modules/pstree.remy/tests/index.test.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/pstree.remy/tests/index.test.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,51 @@
+const tap = require('tap');
+const test = tap.test;
+const readFile = require('fs').readFileSync;
+const spawn = require('child_process').spawn;
+const pstree = require('../');
+const { tree, pidsForTree, getStat } = require('../lib/utils');
+
+if (process.platform !== 'darwin') {
+  test('reads from /proc', async (t) => {
+    const ps = await getStat();
+    t.ok(ps.split('\n').length > 1);
+  });
+}
+
+test('tree for live env', async (t) => {
+  const pid = 4079;
+  const fixture = readFile(__dirname + '/fixtures/out2', 'utf8');
+  const ps = await tree(fixture);
+  t.deepEqual(
+    pidsForTree(ps, pid).map((_) => _.PID),
+    ['4080']
+  );
+});
+
+function testTree(t, runCallCount) {
+  const sub = spawn('node', [`${__dirname}/fixtures/index.js`, runCallCount], {
+    stdio: 'pipe',
+  });
+  setTimeout(() => {
+    const pid = sub.pid;
+
+    pstree(pid, (error, pids) => {
+      pids.concat([pid]).forEach((p) => {
+        spawn('kill', ['-s', 'SIGTERM', p]);
+      });
+
+      // the fixture launches `sh` which launches node which is why we
+      // are looking for two processes.
+      // Important: IDKW but MacOS seems to skip the `sh` process. no idea.
+      t.equal(pids.length, runCallCount * 2);
+      t.end();
+    });
+  }, 1000);
+}
+
+test('can read full process tree', (t) => {
+  testTree(t, 1);
+});
+test('can read full process tree with multiple processes', (t) => {
+  testTree(t, 2);
+});