Add basic support for CI/CD config extension

1 files changed, 63 insertions, 0 deletions

diff --git a/spec/lib/gitlab/ci/config/extendable_spec.rb b/spec/lib/gitlab/ci/config/extendable_spec.rb
new file mode 100644
index 00000000000..a23fe560202
--- /dev/null
+++ b/spec/lib/gitlab/ci/config/extendable_spec.rb
@@ -0,0 +1,63 @@
+require 'fast_spec_helper'
+
+describe Gitlab::Ci::Config::Extendable do
+  subject { described_class.new(hash) }
+
+  describe '#each' do
+    context 'when there is extendable entry in the hash' do
+      let(:test) do
+        { extends: 'something', only: %w[master] }
+      end
+
+      let(:hash) do
+        { something: { script: 'ls' }, test: test }
+      end
+
+      it 'yields the test hash' do
+        expect { |b| subject.each(&b) }
+          .to yield_with_args(:test, :something, test)
+      end
+    end
+
+    pending 'when not extending using a hash'
+  end
+
+  describe '#extend!' do
+    context 'when a hash has a single simple extension' do
+      let(:hash) do
+        {
+          something: {
+            script: 'deploy',
+            only: { variables: %w[$SOMETHING] }
+          },
+          test: {
+            extends: 'something',
+            script: 'ls',
+            only: { refs: %w[master] }
+          }
+        }
+      end
+
+      it 'extends a hash with reverse merge' do
+        expect(subject.extend!).to eq(
+          something: {
+            script: 'deploy',
+            only: { variables: %w[$SOMETHING] }
+          },
+          test: {
+            extends: 'something',
+            script: 'ls',
+            only: {
+              refs: %w[master],
+              variables: %w[$SOMETHING]
+            }
+          }
+        )
+      end
+    end
+
+    pending 'when a hash recursive extensions'
+
+    pending 'when invalid `extends` is specified'
+  end
+end