describe IncomeTax::Countries::Iceland 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(116, 311)           }
    its(:gross_income) { should be == 1000                         }
    its(:net_income)   { should be == 627                          }
    its(:taxes)        { should be == 373                          }
  end

  describe "from gross income of 10000" do
    let(:income)       { 10000                                     }
    its(:rate)         { should be == Rational(116, 311)           }
    its(:gross_income) { should be == 10000                        }
    its(:net_income)   { should be == 6270                         }
    its(:taxes)        { should be == 3730                         }
  end

  describe "from gross income of 100000" do
    let(:income)       { 100000                                    }
    its(:rate)         { should be == Rational(116, 311)           }
    its(:gross_income) { should be == 100000                       }
    its(:net_income)   { should be == 62700                        }
    its(:taxes)        { should be == 37300                        }
  end

  describe "from gross income of 100000000" do
    let(:income)       { 100000000                                 }
    its(:rate)         { should be == Rational(125, 271)           }
    its(:gross_income) { should be == 100000000                    }
    its(:net_income)   { should be == "53874635.676".to_d          }
    its(:taxes)        { should be == "46125364.324".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(116, 311)           }
    its(:gross_income) { should be == "1594.896331738437".to_d     }
    its(:net_income)   { should be == 1000                         }
    its(:taxes)        { should be == "594.896331738437".to_d      }
  end

  describe "from net income of 10000" do
    let(:type)         { :net                                      }
    let(:income)       { 10000                                     }
    its(:rate)         { should be == Rational(116, 311)           }
    its(:gross_income) { should be == "15948.96331738437".to_d     }
    its(:net_income)   { should be == 10000                        }
    its(:taxes)        { should be == "5948.96331738437".to_d      }
  end

  describe "from net income of 100000" do
    let(:type)         { :net                                      }
    let(:income)       { 100000                                    }
    its(:rate)         { should be == Rational(116, 311)           }
    its(:gross_income) { should be == "159489.6331738437".to_d     }
    its(:net_income)   { should be == 100000                       }
    its(:taxes)        { should be == "59489.6331738437".to_d      }
  end

  describe "from net income of 100000000" do
    let(:type)         { :net                                      }
    let(:income)       { 100000000                                 }
    its(:rate)         { should be == Rational(145, 314)           }
    its(:gross_income) { should be == "185798668.757440476".to_d   }
    its(:net_income)   { should be == 100000000                    }
    its(:taxes)        { should be == "85798668.757440476".to_d    }
  end
end
