test(integration): fixed the writer context tests to properly simulate writable stream production

Author: travi

package-lock.json

@@ -34,6 +34,7 @@
     "escape-string-regexp": "5.0.0",
     "fs-extra": "^11.1.0",
     "semantic-release": "20.1.0",
+    "stream-buffers": "3.0.2",
     "tempy": "^3.0.0",
     "testdouble": "3.16.8",
     "xo": "0.39.1"