Configured emulator DNS server and added resolution checks in CI scripts

Author: DenBond7

script/ci-setup-and-run-emulator.sh

@@ -42,4 +42,5 @@ cat "$HOME/.android/avd/${AVD_NAME}.avd/config.ini"
   -wipe-data \
   -gpu swiftshader_indirect \
   -read-only \
-  -no-metrics &
+  -no-metrics \
+  -dns-server 10.0.2.2 &

script/ci-wait-for-emulator.sh

@@ -32,6 +32,10 @@ adb shell "iptables -t nat -A OUTPUT -s 127.0.0.1 -p tcp --dport 443 -j REDIRECT
 # Forwards requests on a specific host port to a different port on a device.
 adb forward tcp:1212 tcp:1212
 
+# Print DNS configuration for easier CI debugging.
+adb shell getprop net.dns1 || true
+adb shell getprop net.dns2 || true
+
 # Check that the emulator has internet connection.
 for attempt in {1..5}; do
   if adb shell "ping -c 1 www.google.com"; then
@@ -46,5 +50,21 @@ for attempt in {1..5}; do
   sleep 2
 done
 
+# Check that Android emulator can resolve FlowCrypt test domains.
+# Host-side dnsmasq resolving is not enough: the emulator has its own DNS configuration.
+for attempt in {1..5}; do
+  if adb shell "ping -c 1 fes.flowcrypt.test"; then
+    break
+  fi
+
+  if [[ "$attempt" -eq 5 ]]; then
+    echo "Emulator can't resolve fes.flowcrypt.test"
+    echo "Make sure ci-setup-and-run-emulator.sh starts emulator with: -dns-server 10.0.2.2"
+    exit 1
+  fi
+
+  sleep 2
+done
+
 echo "Emulator is ready"
-set +o xtrace
+set +o xtrace