fixup! restore tests

test/parallel/test-stream-end-of-streams.js

@@ -0,0 +1,20 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+
+const { Duplex, finished } = require('stream');
+
+assert.throws(
+  () => {
+    // Passing empty object to mock invalid stream
+    // should throw error
+    finished({}, () => {});
+  },
+  { code: 'ERR_INVALID_ARG_TYPE' }
+);
+
+const streamObj = new Duplex();
+streamObj.end();
+// Below code should not throw any errors as the
+// streamObj is `Stream`
+finished(streamObj, () => {});

test/parallel/test-stream-finished.js

@@ -260,7 +260,12 @@ const http = require('http');
   const streamLike = new EE();
   streamLike.readableEnded = true;
   streamLike.readable = true;
-  finished(streamLike, common.mustCall());
+  assert.throws(
+    () => {
+      finished(streamLike, () => {});
+    },
+    { code: 'ERR_INVALID_ARG_TYPE' }
+  );
   streamLike.emit('close');
 }