1 files changed, 50 insertions, 0 deletions
diff --git a/spec/models/ci/runner_machine_build_spec.rb b/spec/models/ci/runner_machine_build_spec.rb
new file mode 100644
index 00000000000..b15d232cbb5
--- /dev/null
+++ b/spec/models/ci/runner_machine_build_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ci::RunnerMachineBuild, model: true, feature_category: :runner_fleet do
+  it { is_expected.to belong_to(:build) }
+  it { is_expected.to belong_to(:runner_machine) }
+
+  describe 'partitioning' do
+    context 'with build' do
+      let(:build) { FactoryBot.build(:ci_build, partition_id: ci_testing_partition_id) }
+      let(:runner_machine_build) { FactoryBot.build(:ci_runner_machine_build, build: build) }
+
+      it 'sets partition_id to the current partition value' do
+        expect { runner_machine_build.valid? }.to change { runner_machine_build.partition_id }
+          .to(ci_testing_partition_id)
+      end
+
+      context 'when it is already set' do
+        let(:runner_machine_build) { FactoryBot.build(:ci_runner_machine_build, partition_id: 125) }
+
+        it 'does not change the partition_id value' do
+          expect { runner_machine_build.valid? }.not_to change { runner_machine_build.partition_id }
+        end
+      end
+    end
+
+    context 'without build' do
+      let(:runner_machine_build) { FactoryBot.build(:ci_runner_machine_build, build: nil) }
+
+      it { is_expected.to validate_presence_of(:partition_id) }
+
+      it 'does not change the partition_id value' do
+        expect { runner_machine_build.valid? }.not_to change { runner_machine_build.partition_id }
+      end
+    end
+  end
+
+  describe 'ci_sliding_list partitioning' do
+    let(:connection) { described_class.connection }
+    let(:partition_manager) { Gitlab::Database::Partitioning::PartitionManager.new(described_class) }
+
+    let(:partitioning_strategy) { described_class.partitioning_strategy }
+
+    it { expect(partitioning_strategy.missing_partitions).to be_empty }
+    it { expect(partitioning_strategy.extra_partitions).to be_empty }
+    it { expect(partitioning_strategy.current_partitions).to include partitioning_strategy.initial_partition }
+    it { expect(partitioning_strategy.active_partition).to be_present }
+  end
+end