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47 lines
1.2 KiB
Ruby
47 lines
1.2 KiB
Ruby
require 'rails_helper'
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describe Frame do
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let(:frame) { described_class.new(snapshot, cursor) }
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let(:snapshot) { double('snapshot', :diff => snapshot_diff) }
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let(:cursor) { double('cursor', :diff => cursor_diff) }
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let(:snapshot_diff) { double('snapshot_diff') }
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let(:cursor_diff) { double('cursor_diff') }
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describe '#diff' do
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let(:other) { double('other', :snapshot => other_snapshot,
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:cursor => other_cursor) }
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let(:other_snapshot) { double('other_snapshot') }
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let(:other_cursor) { double('other_cursor') }
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let(:frame_diff) { double('frame_diff') }
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subject { frame.diff(other) }
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before do
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allow(FrameDiff).to receive(:new).
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with(snapshot_diff, cursor_diff) { frame_diff }
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end
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it 'returns a FrameDiff instance built from snapshot and cursor diffs' do
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expect(subject).to be(frame_diff)
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end
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context "when other is nil" do
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let(:other) { nil }
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it 'diffs its snapshot with nil' do
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subject
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expect(snapshot).to have_received(:diff).with(nil)
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end
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it 'diffs its cursor with nil' do
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subject
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expect(cursor).to have_received(:diff).with(nil)
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end
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end
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end
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end
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