1 files changed, 19 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/input/arguments/base_spec.rb b/spec/lib/gitlab/ci/input/arguments/base_spec.rb
new file mode 100644
index 00000000000..ed8e99b7257
--- /dev/null
+++ b/spec/lib/gitlab/ci/input/arguments/base_spec.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+RSpec.describe Gitlab::Ci::Input::Arguments::Base, feature_category: :pipeline_composition do
+  subject do
+    Class.new(described_class) do
+      def validate!; end
+      def to_value; end
+    end
+  end
+
+  it 'fabricates an invalid input argument if unknown value is provided' do
+    argument = subject.new(:something, { spec: 123 }, [:a, :b])
+
+    expect(argument).not_to be_valid
+    expect(argument.errors.first).to eq 'unsupported value in input argument `something`'
+  end
+end