1 files changed, 49 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/interpolation/config_spec.rb b/spec/lib/gitlab/ci/interpolation/config_spec.rb
new file mode 100644
index 00000000000..e5987776e00
--- /dev/null
+++ b/spec/lib/gitlab/ci/interpolation/config_spec.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+RSpec.describe Gitlab::Ci::Interpolation::Config, feature_category: :pipeline_authoring do
+  subject { described_class.new(YAML.safe_load(config)) }
+
+  let(:config) do
+    <<~CFG
+    test:
+      spec:
+        env: $[[ inputs.env ]]
+
+    $[[ inputs.key ]]:
+      name: $[[ inputs.key ]]
+      script: my-value
+    CFG
+  end
+
+  describe '#replace!' do
+    it 'replaces each od the nodes with a block return value' do
+      result = subject.replace! { |node| "abc#{node}cde" }
+
+      expect(result).to eq({
+        'abctestcde' => { 'abcspeccde' => { 'abcenvcde' => 'abc$[[ inputs.env ]]cde' } },
+        'abc$[[ inputs.key ]]cde' => {
+          'abcnamecde' => 'abc$[[ inputs.key ]]cde',
+          'abcscriptcde' => 'abcmy-valuecde'
+        }
+      })
+    end
+  end
+
+  context 'when config size is exceeded' do
+    before do
+      stub_const("#{described_class}::MAX_NODES", 7)
+    end
+
+    it 'returns a config size error' do
+      replaced = 0
+
+      subject.replace! { replaced += 1 }
+
+      expect(replaced).to eq 4
+      expect(subject.errors.size).to eq 1
+      expect(subject.errors.first).to eq 'config too large'
+    end
+  end
+end