gistfile1.rb

require 'rspec'

require 'webmock/rspec'
WebMock.disable_net_connect!

require 'httparty'

class MyClass
  include HTTParty

  def self.post
    super("http://example.com/", body: "hello world")
  end
end

describe 'Body test' do

  it 'works with body' do
    stub_request(:post, "http://example.com/").to_return(:status => 200, :body => "xxx", :headers => {})
    response = MyClass.post
    expect(response).to_not be_nil
  end

  it 'works with blank body' do
    stub_request(:post, "http://example.com/").to_return(:status => 200, :body => "", :headers => {})
    response = MyClass.post
    expect(response).to_not be_nil
  end

end