tree df7ee354a7e0501c030c830413453b0b997081a2
parent e2791b00d347936d5785aced53e870cd40d6f9b2
author Remi NGUYEN VAN <reminv@google.com> 1623146049 +0900
committer Remi NGUYEN VAN <reminv@google.com> 1623148148 +0900

Fix restorePrivateDnsSetting with null hostnames

When private DNS setting was set to opportunistic (mode) and null
(hostname), CtsNetUtils would not restore it.

Make sure that private DNS settings are restored after every test. Also
fail if restore is called without having saved any setting beforehand.

Bug: 190465704
Test: atest CtsNetTestCases
Change-Id: Ic5d8d8b729469e0eef89a0b53f166e604264c1ee