Add specs for ClustersFinder

spec/finders/clusters_finder_spec.rb

+require 'spec_helper'
+
+describe ClustersFinder do
+  let(:project) { create(:project) }
+  set(:user) { create(:user) }
+
+  describe '#execute' do
+    before do
+      create_list(:cluster, 2, :provided_by_gcp, projects: [project])
+      project.clusters.last.enabled = false
+    end
+
+    subject { described_class.new(project, user, scope).execute }
+
+    context 'when scope is all' do
+      let(:scope) { :all }
+
+      it { is_expected.to eq(project.clusters.to_a) }
+    end
+
+    context 'when scope is enabled' do
+      let(:scope) { :enabled }
+
+      it { is_expected.to eq(project.clusters.enabled.to_a) }
+    end
+
+    context 'when scope is disabled' do
+      let(:scope) { :disabled }
+
+      it { is_expected.to eq(project.clusters.disabled.to_a) }
+    end
+  end
+end