1 files changed, 58 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/config/interpolation/access_spec.rb b/spec/lib/gitlab/ci/config/interpolation/access_spec.rb
new file mode 100644
index 00000000000..ee414c209f7
--- /dev/null
+++ b/spec/lib/gitlab/ci/config/interpolation/access_spec.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+RSpec.describe Gitlab::Ci::Config::Interpolation::Access, feature_category: :pipeline_composition do
+  subject { described_class.new(access, ctx) }
+
+  let(:access) do
+    'inputs.data'
+  end
+
+  let(:ctx) do
+    { inputs: { data: 'abcd' }, env: { 'ENV' => 'dev' } }
+  end
+
+  it 'properly evaluates the access pattern' do
+    expect(subject.value).to eq 'abcd'
+  end
+
+  context 'when there are too many objects in the access path' do
+    let(:access) { 'a.b.c.d.e.f.g.h' }
+
+    it 'only support MAX_ACCESS_OBJECTS steps' do
+      expect(subject.objects.count).to eq 5
+    end
+  end
+
+  context 'when access expression size is too large' do
+    before do
+      stub_const("#{described_class}::MAX_ACCESS_BYTESIZE", 10)
+    end
+
+    it 'returns an error' do
+      expect(subject).not_to be_valid
+      expect(subject.errors.first)
+        .to eq 'maximum interpolation expression size exceeded'
+    end
+  end
+
+  context 'when there are not enough objects in the access path' do
+    let(:access) { 'abc[123]' }
+
+    it 'returns an error when there are no objects found' do
+      expect(subject).not_to be_valid
+      expect(subject.errors.first)
+        .to eq 'invalid interpolation access pattern'
+    end
+  end
+
+  context 'when a non-existent key is accessed' do
+    let(:access) { 'inputs.nonexistent' }
+
+    it 'returns an error' do
+      expect(subject).not_to be_valid
+      expect(subject.errors.first).to eq('unknown interpolation key: `nonexistent`')
+    end
+  end
+end