1 files changed, 81 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/config/entry/rules/rule/changes_spec.rb b/spec/lib/gitlab/ci/config/entry/rules/rule/changes_spec.rb
new file mode 100644
index 00000000000..3ed4a9f263f
--- /dev/null
+++ b/spec/lib/gitlab/ci/config/entry/rules/rule/changes_spec.rb
@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+RSpec.describe Gitlab::Ci::Config::Entry::Rules::Rule::Changes do
+  let(:factory) do
+    Gitlab::Config::Entry::Factory.new(described_class)
+      .value(config)
+  end
+
+  subject(:entry) { factory.create! }
+
+  before do
+    entry.compose!
+  end
+
+  describe '.new' do
+    context 'when using a string array' do
+      let(:config) { %w[app/ lib/ spec/ other/* paths/**/*.rb] }
+
+      it { is_expected.to be_valid }
+    end
+
+    context 'when using an integer array' do
+      let(:config) { [1, 2] }
+
+      it { is_expected.not_to be_valid }
+
+      it 'returns errors' do
+        expect(entry.errors).to include(/changes config should be an array of strings/)
+      end
+    end
+
+    context 'when using a string' do
+      let(:config) { 'a regular string' }
+
+      it { is_expected.not_to be_valid }
+
+      it 'reports an error about invalid policy' do
+        expect(entry.errors).to include(/should be an array of strings/)
+      end
+    end
+
+    context 'when using a long array' do
+      let(:config) { ['app/'] * 51 }
+
+      it { is_expected.not_to be_valid }
+
+      it 'returns errors' do
+        expect(entry.errors).to include(/has too many entries \(maximum 50\)/)
+      end
+    end
+
+    context 'when clause is empty' do
+      let(:config) {}
+
+      it { is_expected.to be_valid }
+    end
+
+    context 'when policy strategy does not match' do
+      let(:config) { 'string strategy' }
+
+      it { is_expected.not_to be_valid }
+
+      it 'returns information about errors' do
+        expect(entry.errors)
+          .to include(/should be an array of strings/)
+      end
+    end
+  end
+
+  describe '#value' do
+    subject(:value) { entry.value }
+
+    context 'when using a string array' do
+      let(:config) { %w[app/ lib/ spec/ other/* paths/**/*.rb] }
+
+      it { is_expected.to eq(config) }
+    end
+  end
+end