1 files changed, 31 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/config/yaml/result_spec.rb b/spec/lib/gitlab/ci/config/yaml/result_spec.rb
new file mode 100644
index 00000000000..eda15ee9eb2
--- /dev/null
+++ b/spec/lib/gitlab/ci/config/yaml/result_spec.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Ci::Config::Yaml::Result, feature_category: :pipeline_composition do
+  it 'does not have a header when config is a single hash' do
+    result = described_class.new(config: { a: 1, b: 2 })
+
+    expect(result).not_to have_header
+  end
+
+  it 'has a header when config is an array of hashes' do
+    result = described_class.new(config: [{ a: 1 }, { b: 2 }])
+
+    expect(result).to have_header
+    expect(result.header).to eq({ a: 1 })
+  end
+
+  it 'raises an error when reading a header when there is none' do
+    result = described_class.new(config: { b: 2 })
+
+    expect { result.header }.to raise_error(ArgumentError)
+  end
+
+  it 'stores an error / exception when initialized with it' do
+    result = described_class.new(error: ArgumentError.new('abc'))
+
+    expect(result).not_to be_valid
+    expect(result.error).to be_a ArgumentError
+  end
+end