require 'spec_helper' describe Gitlab::Ci::Pipeline::Expression::Statement do subject do described_class.new(text, variables) end let(:variables) do { 'PRESENT_VARIABLE' => 'my variable', EMPTY_VARIABLE: '' } end describe '.new' do context 'when variables are not provided' do it 'allows to properly initializes the statement' do statement = described_class.new('$PRESENT_VARIABLE') expect(statement.evaluate).to be_nil end end end describe '#parse_tree' do context 'when expression is empty' do let(:text) { '' } it 'raises an error' do expect { subject.parse_tree } .to raise_error described_class::StatementError end end context 'when expression grammar is incorrect' do table = [ '$VAR "text"', # missing operator '== "123"', # invalid left side '"some string"', # only string provided '$VAR ==', # invalid right side '12345', # unknown syntax '' # empty statement ] table.each do |syntax| context "when expression grammar is #{syntax.inspect}" do let(:text) { syntax } it 'aises a statement error exception' do expect { subject.parse_tree } .to raise_error described_class::StatementError end it 'is an invalid statement' do expect(subject).not_to be_valid end end end end context 'when expression grammar is correct' do context 'when using an operator' do let(:text) { '$VAR == "value"' } it 'returns a reverse descent parse tree' do expect(subject.parse_tree) .to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Equals end it 'is a valid statement' do expect(subject).to be_valid end end context 'when using a single token' do let(:text) { '$PRESENT_VARIABLE' } it 'returns a single token instance' do expect(subject.parse_tree) .to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Variable end end end end describe '#evaluate' do statements = [ ['$PRESENT_VARIABLE == "my variable"', true], ["$PRESENT_VARIABLE == 'my variable'", true], ['"my variable" == $PRESENT_VARIABLE', true], ['$PRESENT_VARIABLE == null', false], ['$EMPTY_VARIABLE == null', false], ['"" == $EMPTY_VARIABLE', true], ['$EMPTY_VARIABLE', ''], ['$UNDEFINED_VARIABLE == null', true], ['null == $UNDEFINED_VARIABLE', true], ['$PRESENT_VARIABLE', 'my variable'], ['$UNDEFINED_VARIABLE', nil] ] statements.each do |expression, value| context "when using expression `#{expression}`" do let(:text) { expression } it "evaluates to `#{value.inspect}`" do expect(subject.evaluate).to eq value end end end end describe '#truthful?' do statements = [ ['$PRESENT_VARIABLE == "my variable"', true], ["$PRESENT_VARIABLE == 'no match'", false], ['$UNDEFINED_VARIABLE == null', true], ['$PRESENT_VARIABLE', true], ['$UNDEFINED_VARIABLE', false], ['$EMPTY_VARIABLE', false] ] statements.each do |expression, value| context "when using expression `#{expression}`" do let(:text) { expression } it "returns `#{value.inspect}`" do expect(subject.truthful?).to eq value end end end end end