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require 'spec_helper'
describe Unparser::Buffer do
describe '#append' do
subject { object.append(string) }
let(:object) { described_class.new }
let(:string) { 'foo' }
specify do
expect { subject }.to change { object.content }.from('').to('foo')
end
it 'should prefix with indentation if line is empty' do
object.append('foo')
object.nl
object.indent
object.append('bar')
object.append('baz')
expect(object.content).to eql("foo\n barbaz")
end
it_should_behave_like 'a command method'
end
describe '#append_without_prefix' do
subject { object.append_without_prefix(string) }
let(:object) { described_class.new }
let(:string) { 'foo' }
specify do
expect { subject }.to change { object.content }.from('').to('foo')
end
it 'should not prefix with indentation' do
object.append_without_prefix('foo')
object.nl
object.indent
object.append_without_prefix('bar')
object.append_without_prefix('baz')
expect(object.content).to eql("foo\nbarbaz")
end
it_should_behave_like 'a command method'
end
describe '#content' do
subject { object.content }
let(:object) { described_class.new }
shared_examples_for 'buffer content' do
it 'contains expected content' do
should eql(expected_content)
end
it { should be_frozen }
it 'returns fresh string copies' do
first = object.content
second = object.content
expect(first).to eql(second)
expect(first).not_to be(second)
end
end
context 'with empty buffer' do
let(:expected_content) { '' }
it_should_behave_like 'buffer content'
end
context 'with filled buffer' do
before do
object.append('foo')
end
let(:expected_content) { 'foo' }
it_behaves_like 'buffer content'
end
end
describe '#fresh_line?' do
let(:object) { described_class.new }
it 'should return true while buffer is empty' do
expect(object.fresh_line?).to eql(true)
end
it 'should return false after content has been appended' do
object.append('foo')
expect(object.fresh_line?).to eql(false)
end
it 'should return true after a nl has been appended' do
object.append('foo')
object.nl
expect(object.fresh_line?).to eql(true)
end
end
describe '#indent' do
let(:object) { described_class.new }
subject { object.indent }
it 'should indent with two spaces' do
object.append('foo')
object.nl
object.indent
object.append('bar')
object.nl
object.indent
object.append('baz')
expect(object.content).to eql("foo\n bar\n baz")
end
it_should_behave_like 'a command method'
end
describe '#nl' do
let(:object) { described_class.new }
subject { object.nl }
it 'writes a newline' do
object.append('foo')
subject
object.append('bar')
expect(object.content).to eql("foo\nbar")
end
it_should_behave_like 'a command method'
end
describe '#unindent' do
let(:object) { described_class.new }
subject { object.unindent }
it 'unindents two chars' do
object.append('foo')
object.nl
object.indent
object.append('bar')
object.nl
object.unindent
object.append('baz')
expect(object.content).to eql("foo\n bar\nbaz")
end
it_should_behave_like 'a command method'
end
end
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