```ruby
require 'spec_helper'

describe Farm do
  before { @farm = build(:farm) }

  it "should be a valid" do
    expect(@farm).to be_valid
  end

  it "geocodes the location when being saved" do
    @farm.save!

    expect(@farm.latitude).not_to be_nil
    expect(@farm.longitude).not_to be_nil
  end
end
```

Add tests for farm relation insertions.
user
```ruby
require 'spec_helper'

describe Farm do
  before { @farm = build(:farm) }

  it "should be a valid" do
    expect(@farm).to be_valid
  end

  it "geocodes the location when being saved" do
    @farm.save!

    expect(@farm.latitude).not_to be_nil
    expect(@farm.longitude).not_to be_nil
  end

  it "inserts a farm relation entry" do
    related_farm = build(:farm, name: "A related farm")
    @farm.places << related_farm.place
    expect(@farm.places).to include(related_farm.place)
  end

  it "inserts a depot relation entry" do
    related_depot = build(:depot, name: "A related depot")
    @farm.places << related_depot.place
    expect(@farm.places).to include(related_depot.place)
  end

end
```
assistant