```ruby
require "test_helper"

class JsonConfigTest < ActiveSupport::TestCase
  include CustomizedFiles

  test "loads default fields.json" do
    config = JsonConfig.default.load("fields.json")
    expected_config = {
      "DateTime" => {
        "display_components" => [],
        "editor_components" => ["DateTimeInput"]
      }
    }
    assert_equal(expected_config, config)
  end

  test "falls back to default fields.json if no override present" do
    catalog = catalogs(:one)
    config = JsonConfig.for_catalog(catalog).load("fields.json")
    expected_config = {
      "DateTime" => {
        "display_components" => [],
        "editor_components" => ["DateTimeInput"]
      }
    }
    assert_equal(expected_config, config)
  end

  test "allows override of fields.json per catalog" do
    catalog = catalogs(:one)
    with_customized_file("test/custom/config/fields.json",
                         "catalogs/one/config/fields.json") do
      config = JsonConfig.for_catalog(catalog).load("fields.json")
      expected_config = {
        "DateTime" => {
          "display_components" => ["Foo"],
          "editor_components" => []
        }
      }
      assert_equal(expected_config, config)
    end
  end
end
```

Adjust default React input configuration in tests
user
```ruby
require "test_helper"

class JsonConfigTest < ActiveSupport::TestCase
  include CustomizedFiles

  test "loads default fields.json" do
    config = JsonConfig.default.load("fields.json")
    expected_config = {
      "DateTime" => {
        "display_components" => [],
        "editor_components" => ["DateTimeInput"]
      },
      "Geometry" => {
        "display_components" => [],
        "editor_components" => ["GeoEditor"]
      }
    }
    assert_equal(expected_config, config)
  end

  test "falls back to default fields.json if no override present" do
    catalog = catalogs(:one)
    config = JsonConfig.for_catalog(catalog).load("fields.json")
    expected_config = {
      "DateTime" => {
        "display_components" => [],
        "editor_components" => ["DateTimeInput"]
      },
      "Geometry" => {
        "display_components" => [],
        "editor_components" => ["GeoEditor"]
      }
    }
    assert_equal(expected_config, config)
  end

  test "allows override of fields.json per catalog" do
    catalog = catalogs(:one)
    with_customized_file("test/custom/config/fields.json",
                         "catalogs/one/config/fields.json") do
      config = JsonConfig.for_catalog(catalog).load("fields.json")
      expected_config = {
        "DateTime" => {
          "display_components" => ["Foo"],
          "editor_components" => []
        }
      }
      assert_equal(expected_config, config)
    end
  end
end
```
assistant