1 files changed, 50 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/components/header_spec.rb b/spec/lib/gitlab/ci/components/header_spec.rb
new file mode 100644
index 00000000000..b1af4ca9238
--- /dev/null
+++ b/spec/lib/gitlab/ci/components/header_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+RSpec.describe Gitlab::Ci::Components::Header, feature_category: :pipeline_composition do
+  subject { described_class.new(spec) }
+
+  context 'when spec is valid' do
+    let(:spec) do
+      {
+        spec: {
+          inputs: {
+            website: nil,
+            run: {
+              options: %w[opt1 opt2]
+            }
+          }
+        }
+      }
+    end
+
+    it 'fabricates a spec from valid data' do
+      expect(subject).not_to be_empty
+    end
+
+    describe '#inputs' do
+      it 'fabricates input data' do
+        input = subject.inputs({ website: 'https//gitlab.com', run: 'opt1' })
+
+        expect(input.count).to eq 2
+      end
+    end
+
+    describe '#context' do
+      it 'fabricates interpolation context' do
+        ctx = subject.context({ website: 'https//gitlab.com', run: 'opt1' })
+
+        expect(ctx).to be_valid
+      end
+    end
+  end
+
+  context 'when spec is empty' do
+    let(:spec) { { spec: {} } }
+
+    it 'returns an empty header' do
+      expect(subject).to be_empty
+    end
+  end
+end