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require 'spec_helper'
describe Gitlab::Ci::Pipeline::Expression::Statement do
let(:pipeline) { build(:ci_pipeline) }
subject do
described_class.new(text, pipeline)
end
before do
pipeline.variables.build([key: 'VARIABLE', value: 'my variable'])
end
describe '#parse_tree' do
context 'when expression is empty' do
let(:text) { '' }
it 'raises an error' do
expect { subject.parse_tree }
.to raise_error described_class::StatementError
end
end
context 'when expression grammar is incorrect' do
table = [
'$VAR "text"', # missing operator
'== "123"', # invalid right side
"'single quotes'", # single quotes string
'$VAR ==', # invalid right side
'12345', # unknown syntax
'' # empty statement
]
table.each do |syntax|
it "raises an error when syntax is `#{syntax}`" do
expect { described_class.new(syntax, pipeline).parse_tree }
.to raise_error described_class::StatementError
end
end
end
context 'when expression grammar is correct' do
context 'when using an operator' do
let(:text) { '$VAR == "value"' }
it 'returns a reverse descent parse tree' do
expect(subject.parse_tree)
.to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Equals
end
end
context 'when using a single token' do
let(:text) { '$VARIABLE' }
it 'returns a single token instance' do
expect(subject.parse_tree)
.to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Variable
end
end
end
end
describe '#evaluate' do
statements = [
['$VARIABLE == "my variable"', true],
["$VARIABLE == 'my variable'", true],
['"my variable" == $VARIABLE', true],
['$VARIABLE == null', false],
['$VAR == null', true],
['null == $VAR', true],
['$VARIABLE', 'my variable'],
['$VAR', nil]
]
statements.each do |expression, value|
context "when using expression `#{expression}`" do
let(:text) { expression }
it "evaluates to `#{value.inspect}`" do
expect(subject.evaluate).to eq value
end
end
end
end
end
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