132 lines
5.0 KiB
Ruby
132 lines
5.0 KiB
Ruby
require 'rails_helper'
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RSpec.describe UnitConversion do
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describe '.auto_unit' do
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it 'leaves units alone if reasonable' do
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expect(UnitConversion.auto_unit('1/2', 'tbsp')).to eq ['1/2', 'tablespoon']
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expect(UnitConversion.auto_unit('2', 'cups')).to eq ['2', 'cup']
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expect(UnitConversion.auto_unit('1', 'c')).to eq ['1', 'cup']
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end
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it 'leaves units alone if unknown' do
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expect(UnitConversion.auto_unit('1/16', 'splat')).to eq ['1/16', 'splat']
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expect(UnitConversion.auto_unit('4.5', 'dogs')).to eq ['4.5', 'dogs']
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expect(UnitConversion.auto_unit('0', '')).to eq ['0', '']
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end
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it 'converts standard volume units correctly' do
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expect(UnitConversion.auto_unit('6', 'tsp')).to eq ['2', 'tablespoon']
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expect(UnitConversion.auto_unit('24', 'tsp')).to eq ['1/2', 'cup']
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expect(UnitConversion.auto_unit('1/16', 'cup')).to eq ['1', 'tablespoon']
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expect(UnitConversion.auto_unit('1/48', 'cup')).to eq ['1', 'teaspoon']
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expect(UnitConversion.auto_unit('768', 'tsp')).to eq ['1', 'gallon']
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expect(UnitConversion.auto_unit('6', '[tsp_us]')).to eq ['2', 'tablespoon']
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end
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it 'converts standard mass units correctly' do
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expect(UnitConversion.auto_unit('32', 'oz')).to eq ['2', 'pound']
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expect(UnitConversion.auto_unit('40', 'oz')).to eq ['2 1/2', 'pound']
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expect(UnitConversion.auto_unit('3/4', 'lb')).to eq ['12', 'ounce']
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expect(UnitConversion.auto_unit('0.0625', 'lb')).to eq ['1', 'ounce']
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end
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end
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describe '.convert' do
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it 'scales decimal numbers' do
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expect(UnitConversion.convert('1', '2', 'cup', 'cup')).to eq '2'
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expect(UnitConversion.convert('1.5', '2', 'cup', 'cup')).to eq '3'
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expect(UnitConversion.convert('4', '.5', 'cup', 'cup')).to eq '2'
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expect(UnitConversion.convert('4', '1/2', 'cup', 'cup')).to eq '2'
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end
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it 'scales rational numbers' do
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expect(UnitConversion.convert('1/2', '2', 'cup', 'cup')).to eq '1'
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expect(UnitConversion.convert('1 1/2', '2', 'cup', 'cup')).to eq '3'
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expect(UnitConversion.convert('4', '.5', 'cup', 'cup')).to eq '2'
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expect(UnitConversion.convert('4', '1/2', 'cup', 'cup')).to eq '2'
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expect(UnitConversion.convert('2', '1/3', 'cup', 'cup')).to eq '2/3'
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end
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it 'converts units' do
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expect(UnitConversion.convert('1/2', '1', 'cup', 'tbsp')).to eq '8'
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expect(UnitConversion.convert('8', '1', 'tablespoon', 'cup')).to eq '1/2'
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expect(UnitConversion.convert('1', '1', 'tablespoon', 'cup')).to eq '1/16'
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expect(UnitConversion.convert('2.0', '1', 'tablespoon', 'cup')).to eq '0.125'
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expect(UnitConversion.convert('2/3', '1', 'tablespoon', 'teaspoons')).to eq '2'
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expect(UnitConversion.convert('2', '4', 'teaspoons', 'tablespoons')).to eq '2 2/3'
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end
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it 'scales odd units without conversion' do
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expect(UnitConversion.convert('1/2', '2', 'slices', 'slices')).to eq '1'
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expect(UnitConversion.convert('4', '1/8', nil, nil)).to eq '1/2'
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expect(UnitConversion.convert('4', '1/8', 'slices', nil)).to eq '1/2'
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expect(UnitConversion.convert('4', '1/8', 'slices', '')).to eq '1/2'
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end
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it 'converts and scales' do
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expect(UnitConversion.convert('1/2', '2', 'cup', 'tbsp')).to eq '16'
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expect(UnitConversion.convert('2.0', '1 1/2', 'tablespoon', 'cup')).to eq '0.188'
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expect(UnitConversion.convert('2', '1 1/2', 'tablespoon', 'cup')).to eq '3/16'
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end
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it 'converts from volume to mass' do
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expect(UnitConversion.convert('5', '1', 'cup', 'ounce', '5 oz/c')).to eq '25'
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end
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it 'converts from mass to volume' do
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expect(UnitConversion.convert('25', '1', 'ounce', 'cup', '5 oz/c')).to eq '5'
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end
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end
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describe '.parse' do
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it 'correctly parses strings to Units' do
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data = {
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'4 c' => Unitwise(4, 'cup'),
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'5.5 oz' => Unitwise(5.5, 'ounce'),
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'-4 tbsp' => Unitwise(-4, 'tablespoon'),
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'223 g/c' => Unitwise(223, 'gram/cup'),
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'1/3 c' => Unitwise("1/3".to_r, 'cup'),
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'-5/16 g' => Unitwise("-5/16".to_r, 'gram'),
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'2 1/2 c' => Unitwise("5/2".to_r, 'cup'),
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'1.03 gram/ml' => Unitwise(1.03, 'g/ml')
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}
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data.each do |input, output|
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expect(UnitConversion.parse(input).unitwise).to eq output
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end
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end
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it 'raises UnknownUnitError with bad units' do
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data = [
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'5 cats',
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'33 gulps/thinking',
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'9.2 meeters/s2',
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'5/8 floor'
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]
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data.each do |input|
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expect { UnitConversion.parse(input).unitwise }.to raise_error(UnitConversion::UnknownUnitError), "'#{input}' didn't raise"
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end
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end
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it 'raises UnparseableUnitError on malformed string' do
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data = [
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'5.5/2 cups',
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'2/3.0 cups',
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'ounce',
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'-.4 cups',
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'gallons 6',
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'5,5 tsp'
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]
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data.each do |input|
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expect { UnitConversion.parse(input) }.to raise_error(UnitConversion::UnparseableUnitError), "'#{input}' didn't raise"
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end
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end
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end
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end
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