debian-mirror-gitlab/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb

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require 'spec_helper'
describe Gitlab::Ci::Pipeline::Expression::Statement do
subject do
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described_class.new(text, variables)
end
let(:variables) do
{ 'PRESENT_VARIABLE' => 'my variable',
EMPTY_VARIABLE: '' }
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end
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describe '.new' do
context 'when variables are not provided' do
it 'allows to properly initializes the statement' do
statement = described_class.new('$PRESENT_VARIABLE')
expect(statement.evaluate).to be_nil
end
end
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end
describe '#parse_tree' do
context 'when expression is empty' do
let(:text) { '' }
it 'raises an error' do
expect { subject.parse_tree }
.to raise_error described_class::StatementError
end
end
context 'when expression grammar is incorrect' do
table = [
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'$VAR "text"', # missing operator
'== "123"', # invalid left side
'"some string"', # only string provided
'$VAR ==', # invalid right side
'12345', # unknown syntax
'' # empty statement
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]
table.each do |syntax|
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context "when expression grammar is #{syntax.inspect}" do
let(:text) { syntax }
it 'aises a statement error exception' do
expect { subject.parse_tree }
.to raise_error described_class::StatementError
end
it 'is an invalid statement' do
expect(subject).not_to be_valid
end
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end
end
end
context 'when expression grammar is correct' do
context 'when using an operator' do
let(:text) { '$VAR == "value"' }
it 'returns a reverse descent parse tree' do
expect(subject.parse_tree)
.to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Equals
end
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it 'is a valid statement' do
expect(subject).to be_valid
end
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end
context 'when using a single token' do
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let(:text) { '$PRESENT_VARIABLE' }
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it 'returns a single token instance' do
expect(subject.parse_tree)
.to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Variable
end
end
end
end
describe '#evaluate' do
statements = [
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['$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'],
['$UNDEFINED_VARIABLE', nil]
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]
statements.each do |expression, value|
context "when using expression `#{expression}`" do
let(:text) { expression }
it "evaluates to `#{value.inspect}`" do
expect(subject.evaluate).to eq value
end
end
end
end
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describe '#truthful?' do
statements = [
['$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
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end