Implement SuggestionService to provide a fake suggestion.

          package="com.android.settings.intelligence">

    <uses-sdk android:minSdkVersion="27" android:targetSdkVersion="27" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application>

        <service

            android:name=".suggestions.SuggestionService"

            android:exported="true"

            android:permission="android.permission.BIND_SETTINGS_SUGGESTIONS_SERVICE" />

    </application>

</manifest>

package com.android.settings.intelligence.suggestions;

public class SuggestionService {

import android.service.settings.suggestions.Suggestion;

import android.util.Log;

import java.util.ArrayList;

import java.util.List;

public class SuggestionService extends android.service.settings.suggestions.SuggestionService  {

    private static final String TAG = "SuggestionService";

    @Override

    public List<Suggestion> onGetSuggestions() {

        final List<Suggestion> data = new ArrayList<>();

        data.add(new Suggestion.Builder("test").build());

        return data;

    }

    @Override

    public void onSuggestionDismissed(Suggestion suggestion) {

        Log.d(TAG, "dismissing suggestion " + suggestion.getTitle());

    }

}