1 files changed, 43 insertions, 0 deletions
diff --git a/spec/lib/gitlab/config/entry/validators_spec.rb b/spec/lib/gitlab/config/entry/validators_spec.rb
new file mode 100644
index 00000000000..cbc09aac586
--- /dev/null
+++ b/spec/lib/gitlab/config/entry/validators_spec.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Config::Entry::Validators do
+  let(:klass) do
+    Class.new do
+      include ActiveModel::Validations
+      include Gitlab::Config::Entry::Validators
+    end
+  end
+
+  let(:instance) { klass.new }
+
+  describe described_class::MutuallyExclusiveKeysValidator do
+    using RSpec::Parameterized::TableSyntax
+
+    before do
+      klass.instance_eval do
+        validates :config, mutually_exclusive_keys: [:foo, :bar]
+      end
+
+      allow(instance).to receive(:config).and_return(config)
+    end
+
+    where(:context, :config, :valid_result) do
+      'with mutually exclusive keys' | { foo: 1, bar: 2 } | false
+      'without mutually exclusive keys' | { foo: 1 } | true
+      'without mutually exclusive keys' | { bar: 1 } | true
+      'with other keys' | { foo: 1, baz: 2 } | true
+    end
+
+    with_them do
+      it 'validates the instance' do
+        expect(instance.valid?).to be(valid_result)
+
+        unless valid_result
+          expect(instance.errors.messages_for(:config)).to include /please use only one the following keys: foo, bar/
+        end
+      end
+    end
+  end
+end