describe IncomeTax::Countries::UnitedStates do
  subject(:result) { described_class.new(income: income, income_type: type) }
  let(:type) { :gross }

  describe "from gross income of 0" do
    let(:income)       { 0                                         }
    its(:rate)         { should be == Rational(0, 1)               }
    its(:gross_income) { should be == 0                            }
    its(:net_income)   { should be == 0                            }
    its(:taxes)        { should be == 0                            }
  end

  describe "from gross income of 1000" do
    let(:income)       { 1000                                      }
    its(:rate)         { should be == Rational(1, 10)              }
    its(:gross_income) { should be == 1000                         }
    its(:net_income)   { should be == 900                          }
    its(:taxes)        { should be == 100                          }
  end

  describe "from gross income of 10000" do
    let(:income)       { 10000                                     }
    its(:rate)         { should be == Rational(1, 10)              }
    its(:gross_income) { should be == 10000                        }
    its(:net_income)   { should be == 9000                         }
    its(:taxes)        { should be == 1000                         }
  end

  describe "from gross income of 100000" do
    let(:income)       { 100000                                    }
    its(:rate)         { should be == Rational(63, 316)            }
    its(:gross_income) { should be == 100000                       }
    its(:net_income)   { should be == "80062.75".to_d              }
    its(:taxes)        { should be == "19937.25".to_d              }
  end

  describe "from gross income of 100000000" do
    let(:income)       { 100000000                                 }
    its(:rate)         { should be == Rational(142, 359)           }
    its(:gross_income) { should be == 100000000                    }
    its(:net_income)   { should be == "60445495.75".to_d           }
    its(:taxes)        { should be == "39554504.25".to_d           }
  end

  describe "from net income of 0" do
    let(:type)         { :net                                      }
    let(:income)       { 0                                         }
    its(:rate)         { should be == Rational(0, 1)               }
    its(:gross_income) { should be == 0                            }
    its(:net_income)   { should be == 0                            }
    its(:taxes)        { should be == 0                            }
  end

  describe "from net income of 1000" do
    let(:type)         { :net                                      }
    let(:income)       { 1000                                      }
    its(:rate)         { should be == Rational(1, 10)              }
    its(:gross_income) { should be == "1111.111111111111111".to_d  }
    its(:net_income)   { should be == 1000                         }
    its(:taxes)        { should be == "111.111111111111111".to_d   }
  end

  describe "from net income of 10000" do
    let(:type)         { :net                                      }
    let(:income)       { 10000                                     }
    its(:rate)         { should be == Rational(1, 10)              }
    its(:gross_income) { should be == "11111.1111111111111".to_d   }
    its(:net_income)   { should be == 10000                        }
    its(:taxes)        { should be == "1111.1111111111111".to_d    }
  end

  describe "from net income of 100000" do
    let(:type)         { :net                                      }
    let(:income)       { 100000                                    }
    its(:rate)         { should be == Rational(139, 641)           }
    its(:gross_income) { should be == "127690.625".to_d            }
    its(:net_income)   { should be == 100000                       }
    its(:taxes)        { should be == "27690.625".to_d             }
  end

  describe "from net income of 100000000" do
    let(:type)         { :net                                      }
    let(:income)       { 100000000                                 }
    its(:rate)         { should be == Rational(74, 187)            }
    its(:gross_income) { should be == "165487589.817880794".to_d   }
    its(:net_income)   { should be == 100000000                    }
    its(:taxes)        { should be == "65487589.817880794".to_d    }
  end
end
