Don't rename the subject

[sirion1987]

# good
RSpec.describe Foo do
  subject { described_class.new }

  it 'is valid' do
    expect(subject.valid?).to be(true)
  end
end

# bad
RSpec.describe Foo do
  # Foo or user?
  subject(:user) { described_class.new }

  it 'is valid' do
    expect(user.valid?).to be(true)
  end
end