1 files changed, 92 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/pipeline/expression/lexeme/string_spec.rb b/spec/lib/gitlab/ci/pipeline/expression/lexeme/string_spec.rb
new file mode 100644
index 00000000000..86234dfb9e5
--- /dev/null
+++ b/spec/lib/gitlab/ci/pipeline/expression/lexeme/string_spec.rb
@@ -0,0 +1,92 @@
+require 'spec_helper'
+
+describe Gitlab::Ci::Pipeline::Expression::Lexeme::String do
+  describe '.build' do
+    it 'creates a new instance of the token' do
+      expect(described_class.build('"my string"'))
+        .to be_a(described_class)
+    end
+  end
+
+  describe '.type' do
+    it 'is a value lexeme' do
+      expect(described_class.type).to eq :value
+    end
+  end
+
+  describe '.scan' do
+    context 'when using double quotes' do
+      it 'correctly identifies string token' do
+        scanner = StringScanner.new('"some string"')
+
+        token = described_class.scan(scanner)
+
+        expect(token).not_to be_nil
+        expect(token.build.evaluate).to eq 'some string'
+      end
+    end
+
+    context 'when using single quotes' do
+      it 'correctly identifies string token' do
+        scanner = StringScanner.new("'some string 2'")
+
+        token = described_class.scan(scanner)
+
+        expect(token).not_to be_nil
+        expect(token.build.evaluate).to eq 'some string 2'
+      end
+    end
+
+    context 'when there are mixed quotes in the string' do
+      it 'is a greedy scanner for double quotes' do
+        scanner = StringScanner.new('"some string" "and another one"')
+
+        token = described_class.scan(scanner)
+
+        expect(token).not_to be_nil
+        expect(token.build.evaluate).to eq 'some string'
+      end
+
+      it 'is a greedy scanner for single quotes' do
+        scanner = StringScanner.new("'some string' 'and another one'")
+
+        token = described_class.scan(scanner)
+
+        expect(token).not_to be_nil
+        expect(token.build.evaluate).to eq 'some string'
+      end
+
+      it 'allows to use single quotes inside double quotes' do
+        scanner = StringScanner.new(%("some ' string"))
+
+        token = described_class.scan(scanner)
+
+        expect(token).not_to be_nil
+        expect(token.build.evaluate).to eq "some ' string"
+      end
+
+      it 'allow to use double quotes inside single quotes' do
+        scanner = StringScanner.new(%('some " string'))
+
+        token = described_class.scan(scanner)
+
+        expect(token).not_to be_nil
+        expect(token.build.evaluate).to eq 'some " string'
+      end
+    end
+  end
+
+  describe '#evaluate' do
+    it 'returns string value it is is present' do
+      string = described_class.new('my string')
+
+      expect(string.evaluate).to eq 'my string'
+    end
+
+    it 'returns an empty string if it is empty' do
+      string = described_class.new('')
+
+      expect(string.evaluate).to eq ''
+    end
+  end
+end