data.js

with (admin.database().ref().child("test").child("Admin")) {
    set(null);
    push().set({"hoge": 1, "fuga": 5});
    push().set({"hoge": 2, "fuga": 4});
    push().set({"hoge": 3, "fuga": 3});
    push().set({"hoge": 4, "fuga": 2});
    push().set({"hoge": 5, "fuga": 1});
}