96 lines
2.7 KiB
Ruby
96 lines
2.7 KiB
Ruby
# Nathan Hinton 2 Oct 2025
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# Test file for the ship object
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require './ship'
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RSpec.describe Ship do
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let(:initial_x) { 0 }
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let(:initial_y) { 0 }
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subject(:ship) { Ship.new(initial_x, initial_y) }
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describe '#initialize' do
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it 'stores the given position' do
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expect(ship.instance_variable_get(:@position)).to eq([initial_x, initial_y])
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end
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it 'sets the speed to 0.1' do
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expect(ship.instance_variable_get(:@speed)).to eq(0.1)
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end
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it 'does not set @moving until a direction is chosen' do
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expect(ship.instance_variable_get(:@moving)).to be_nil
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end
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end
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describe '#tick' do
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it 'does nothing (but does not raise an exception)' do
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expect { ship.tick }.not_to raise_error
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end
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end
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describe '#move' do
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context 'when coordinates are valid' do
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it 'accepts adjacent moves whose sum is even' do
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# adjacent positions that satisfy the rules
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expect { ship.move(1, 1) }.not_to raise_error # sum = 2
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expect { ship.move(2, 0) }.not_to raise_error # sum = 2
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expect { ship.move(0, 2) }.not_to raise_error # sum = 2
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expect { ship.move(-1, -1) }.not_to raise_error # sum = -2
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end
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end
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context 'when the x + y sum is odd' do
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it 'raises an ArgumentError' do
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expect { ship.move(0, 1) }.to raise_error(
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ArgumentError,
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/must add to be even/
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)
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end
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end
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context 'when the target is not adjacent' do
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it 'raises an ArgumentError' do
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# distance > 1: difference of sums != 2
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expect { ship.move(3, 3) }.to raise_error(
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ArgumentError,
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/must be to an adjcent space/
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)
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expect { ship.move(0, 0) }.to raise_error(
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ArgumentError,
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/must be to an adjcent space/
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)
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end
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end
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end
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describe '#move_direction' do
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it 'accepts direction values between 0 and 5' do
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(0..5).each do |direction|
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expect { ship.move_direction(direction) }.not_to raise_error
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# verify the @moving vector matches the spec
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expected = case direction
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when 0 then [2, 0]
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when 1 then [1, 1]
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when 2 then [-1, 1]
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when 3 then [-2, 0]
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when 4 then [-1, -1]
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when 5 then [1, -1]
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end
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expect(ship.instance_variable_get(:@moving)).to eq(expected)
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end
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end
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it 'raises an ArgumentError for invalid directions' do
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expect { ship.move_direction(-1) }.to raise_error(
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ArgumentError,
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/must be between \(0..5\)/
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)
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expect { ship.move_direction(6) }.to raise_error(
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ArgumentError,
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/must be between \(0..5\)/
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)
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end
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end
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end
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