1 files changed, 98 insertions, 0 deletions
diff --git a/spec/lib/gitlab/database/postgres_partitioned_table_spec.rb b/spec/lib/gitlab/database/postgres_partitioned_table_spec.rb
new file mode 100644
index 00000000000..21a46f1a0a6
--- /dev/null
+++ b/spec/lib/gitlab/database/postgres_partitioned_table_spec.rb
@@ -0,0 +1,98 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Database::PostgresPartitionedTable, type: :model do
+  let(:schema) { 'public' }
+  let(:name) { 'foo_range' }
+  let(:identifier) { "#{schema}.#{name}" }
+
+  before do
+    ActiveRecord::Base.connection.execute(<<~SQL)
+      CREATE TABLE #{identifier} (
+        id serial NOT NULL,
+        created_at timestamptz NOT NULL,
+        PRIMARY KEY (id, created_at)
+      ) PARTITION BY RANGE(created_at);
+
+      CREATE TABLE public.foo_list (
+        id serial NOT NULL,
+        row_type text NOT NULL,
+        PRIMARY KEY (id, row_type)
+      ) PARTITION BY LIST(row_type);
+
+      CREATE TABLE public.foo_hash (
+        id serial NOT NULL,
+        row_value int NOT NULL,
+        PRIMARY KEY (id, row_value)
+      ) PARTITION BY HASH (row_value);
+    SQL
+  end
+
+  def find(identifier)
+    described_class.by_identifier(identifier)
+  end
+
+  describe 'associations' do
+    it { is_expected.to have_many(:postgres_partitions).with_primary_key('identifier').with_foreign_key('parent_identifier') }
+  end
+
+  it_behaves_like 'a postgres model'
+
+  describe '.find_by_name_in_current_schema' do
+    it 'finds the partitioned tables in the current schema by name', :aggregate_failures do
+      partitioned_table = described_class.find_by_name_in_current_schema(name)
+
+      expect(partitioned_table).not_to be_nil
+      expect(partitioned_table.identifier).to eq(identifier)
+    end
+
+    it 'does not find partitioned tables in a different schema' do
+      ActiveRecord::Base.connection.execute(<<~SQL)
+        ALTER TABLE #{identifier} SET SCHEMA gitlab_partitions_dynamic
+      SQL
+
+      expect(described_class.find_by_name_in_current_schema(name)).to be_nil
+    end
+  end
+
+  describe '#dynamic?' do
+    it 'returns true for tables partitioned by range' do
+      expect(find('public.foo_range')).to be_dynamic
+    end
+
+    it 'returns true for tables partitioned by list' do
+      expect(find('public.foo_list')).to be_dynamic
+    end
+
+    it 'returns false for tables partitioned by hash' do
+      expect(find('public.foo_hash')).not_to be_dynamic
+    end
+  end
+
+  describe '#static?' do
+    it 'returns false for tables partitioned by range' do
+      expect(find('public.foo_range')).not_to be_static
+    end
+
+    it 'returns false for tables partitioned by list' do
+      expect(find('public.foo_list')).not_to be_static
+    end
+
+    it 'returns true for tables partitioned by hash' do
+      expect(find('public.foo_hash')).to be_static
+    end
+  end
+
+  describe '#strategy' do
+    it 'returns the partitioning strategy' do
+      expect(find(identifier).strategy).to eq('range')
+    end
+  end
+
+  describe '#key_columns' do
+    it 'returns the partitioning key columns' do
+      expect(find(identifier).key_columns).to match_array(['created_at'])
+    end
+  end
+end