1 files changed, 68 insertions, 23 deletions

diff --git a/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb b/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb
index 472a58599d8..6685bf5385b 100644
--- a/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/expression/statement_spec.rb
@@ -1,14 +1,23 @@
 require 'spec_helper'
 
 describe Gitlab::Ci::Pipeline::Expression::Statement do
-  let(:pipeline) { build(:ci_pipeline) }
-
   subject do
-    described_class.new(text, pipeline)
+    described_class.new(text, variables)
+  end
+
+  let(:variables) do
+    { 'PRESENT_VARIABLE' => 'my variable',
+      EMPTY_VARIABLE: '' }
   end
 
-  before do
-    pipeline.variables.build([key: 'VARIABLE', value: 'my variable'])
+  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
@@ -23,18 +32,26 @@ describe Gitlab::Ci::Pipeline::Expression::Statement do
 
     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
+        '$VAR "text"',   # missing operator
+        '== "123"',      # invalid left side
+        '"some string"', # only string provided
+        '$VAR ==',       # invalid right side
+        '12345',         # unknown syntax
+        ''               # empty statement
       ]
 
       table.each do |syntax|
-        it "raises an error when syntax is `#{syntax}`" do
-          expect { described_class.new(syntax, pipeline).parse_tree }
-            .to raise_error described_class::StatementError
+        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
@@ -47,10 +64,14 @@ describe Gitlab::Ci::Pipeline::Expression::Statement 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) { '$VARIABLE' }
+        let(:text) { '$PRESENT_VARIABLE' }
 
         it 'returns a single token instance' do
           expect(subject.parse_tree)
@@ -62,14 +83,17 @@ describe Gitlab::Ci::Pipeline::Expression::Statement do
 
   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'],
-      ['$VAR', nil]
+      ['$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|
@@ -82,4 +106,25 @@ describe Gitlab::Ci::Pipeline::Expression::Statement do
       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