Try to block the internet connection after PONR

tests/integration/tier1/destructive/error-after-ponr/test_error_after_ponr.py

@@ -8,18 +8,26 @@ def test_error_after_ponr(convert2rhel, shell):
 
     This test destroys the machine so neither reboot nor any checks after conversion are called
     """
+    assert shell("yum install dnsmasq -y").returncode == 0
     with convert2rhel(
         "-y --serverurl {} --username {} --password {} --debug".format(
             TEST_VARS["RHSM_SERVER_URL"],
             TEST_VARS["RHSM_SCA_USERNAME"],
             TEST_VARS["RHSM_SCA_PASSWORD"],
         )
     ) as c2r:
-        # Wait until "Replace system packages" task to cause the failure
-        # This will prevent yum restoring the original configuration
-        c2r.expect("CONVERT_SYSTEM_PACKAGES has succeeded")
+        # Wait until Point of no return appears. Then block all the internet connection
+        c2r.expect_exact("WARNING - The tool allows rollback of any action until this point.")
+        c2r.expect_exact("Convert: Replace system packages")
 
-        assert shell('echo "proxy=localhost" >> /etc/yum.conf').returncode == 0
+        # Everything is resolved to localhost
+        with open("/etc/dnsmasq.conf", "a") as f:
+            f.write("address=/#/127.0.0.1")
+
+        with open("/etc/resolv.conf", "w") as f:
+            f.write("nameserver 127.0.0.1")
+
+        assert shell("systemctl enable dnsmasq && systemctl restart dnsmasq").returncode == 0
 
         c2r.expect("WARNING - The conversion process failed")
         c2r.expect(
@@ -29,4 +37,4 @@ def test_error_after_ponr(convert2rhel, shell):
             "It is strongly recommended to store the Convert2RHEL logs for later investigation, and restore the system from a backup"
         )
 
-    assert c2r.exitstatus == 1
+    assert c2r.exitstatus == 2