Implement pipeline expressions parser

1 files changed, 36 insertions, 0 deletions

diff --git a/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb b/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb
index 76d0163e44b..7f5f55660be 100644
--- a/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb
@@ -1,4 +1,40 @@
 require 'spec_helper'
 
 describe Gitlab::Ci::Pipeline::Expression::Statement do
+  let(:pipeline) { build(:ci_pipeline) }
+  let(:text) { '$VAR "text"' }
+
+  subject do
+    described_class.new(text, pipeline)
+  end
+
+  describe '#tokens' do
+    it 'returns raw tokens' do
+      expect(subject.tokens.size).to eq 2
+    end
+  end
+
+  describe '#lexemes' do
+    it 'returns an array of syntax lexemes' do
+      expect(subject.lexemes).to eq %w[variable string]
+    end
+  end
+
+  describe '#parse_tree' do
+    context 'when expression grammar is incorrect' do
+      it 'raises an error' do
+        expect { subject.parse_tree }
+          .to raise_error described_class::ParserError
+      end
+    end
+
+    context 'when expression grammar is correct' do
+      let(:text) { '$VAR == "value"' }
+
+      it 'returns a reverse descent parse tree when using operator' do
+        expect(subject.parse_tree)
+          .to be_a Gitlab::Ci::Pipeline::Expression::Equals
+      end
+    end
+  end
 end