tether setting: fix test error: updateDisplay_shouldUpdateValue

ag/10257734 change band convert to general design.
Fix test to match new design

Bug: 149251992
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.wifi
Test: make RunSettingsRoboTests ROBOTEST_FILTER=CodeInspectionTest
Change-Id: I6f09d9d4f440515fb51a237d966327e232fe5928
diff --git a/tests/robotests/src/com/android/settings/wifi/tether/WifiTetherApBandPreferenceControllerTest.java b/tests/robotests/src/com/android/settings/wifi/tether/WifiTetherApBandPreferenceControllerTest.java
index 32cec68..e639b67 100644
--- a/tests/robotests/src/com/android/settings/wifi/tether/WifiTetherApBandPreferenceControllerTest.java
+++ b/tests/robotests/src/com/android/settings/wifi/tether/WifiTetherApBandPreferenceControllerTest.java
@@ -160,7 +160,7 @@
         // Set controller band index to 5GHz and verify is set.
         mController.displayPreference(mScreen);
         mController.onPreferenceChange(mPreference, VAL_5GHZ_STR);
-        assertThat(mController.getBandIndex()).isEqualTo(VAL_5GHZ_INT);
+        assertThat(mController.getBandIndex()).isEqualTo(VAL_2_5_GHZ_INT);
 
         // Disable 5Ghz band
         when(mWifiManager.is5GHzBandSupported()).thenReturn(false);