1 files changed, 95 insertions, 0 deletions
diff --git a/spec/lib/gitlab/database/schema_version_files_spec.rb b/spec/lib/gitlab/database/schema_version_files_spec.rb
new file mode 100644
index 00000000000..c3b3ae0a07f
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+++ b/spec/lib/gitlab/database/schema_version_files_spec.rb
@@ -0,0 +1,95 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Database::SchemaVersionFiles do
+  describe '.touch_all' do
+    let(:version1) { '20200123' }
+    let(:version2) { '20200410' }
+    let(:version3) { '20200602' }
+    let(:version4) { '20200809' }
+    let(:relative_schema_directory) { 'db/schema_migrations' }
+    let(:relative_migrate_directory) { 'db/migrate' }
+    let(:relative_post_migrate_directory) { 'db/post_migrate' }
+
+    it 'creates a file containing a checksum for each version with a matching migration' do
+      Dir.mktmpdir do |tmpdir|
+        schema_directory = Pathname.new(tmpdir).join(relative_schema_directory)
+        migrate_directory = Pathname.new(tmpdir).join(relative_migrate_directory)
+        post_migrate_directory = Pathname.new(tmpdir).join(relative_post_migrate_directory)
+
+        FileUtils.mkdir_p(migrate_directory)
+        FileUtils.mkdir_p(post_migrate_directory)
+        FileUtils.mkdir_p(schema_directory)
+
+        migration1_filepath = migrate_directory.join("#{version1}_migration.rb")
+        FileUtils.touch(migration1_filepath)
+
+        migration2_filepath = post_migrate_directory.join("#{version2}_post_migration.rb")
+        FileUtils.touch(migration2_filepath)
+
+        old_version_filepath = schema_directory.join('20200101')
+        FileUtils.touch(old_version_filepath)
+
+        expect(File.exist?(old_version_filepath)).to be(true)
+
+        allow(described_class).to receive(:schema_directory).and_return(schema_directory)
+        allow(described_class).to receive(:migration_directories).and_return([migrate_directory, post_migrate_directory])
+
+        described_class.touch_all([version1, version2, version3, version4])
+
+        expect(File.exist?(old_version_filepath)).to be(false)
+        [version1, version2].each do |version|
+          version_filepath = schema_directory.join(version)
+          expect(File.exist?(version_filepath)).to be(true)
+
+          hashed_value = Digest::SHA256.hexdigest(version)
+          expect(File.read(version_filepath)).to eq(hashed_value)
+        end
+
+        [version3, version4].each do |version|
+          version_filepath = schema_directory.join(version)
+          expect(File.exist?(version_filepath)).to be(false)
+        end
+      end
+    end
+  end
+
+  describe '.load_all' do
+    let(:connection) { double('connection') }
+
+    before do
+      allow(described_class).to receive(:connection).and_return(connection)
+      allow(described_class).to receive(:find_version_filenames).and_return(filenames)
+    end
+
+    context 'when there are no version files' do
+      let(:filenames) { [] }
+
+      it 'does nothing' do
+        expect(connection).not_to receive(:quote_string)
+        expect(connection).not_to receive(:execute)
+
+        described_class.load_all
+      end
+    end
+
+    context 'when there are version files' do
+      let(:filenames) { %w[123 456 789] }
+
+      it 'inserts the missing versions into schema_migrations' do
+        filenames.each do |filename|
+          expect(connection).to receive(:quote_string).with(filename).and_return(filename)
+        end
+
+        expect(connection).to receive(:execute).with(<<~SQL)
+          INSERT INTO schema_migrations (version)
+          VALUES ('123'),('456'),('789')
+          ON CONFLICT DO NOTHING
+        SQL
+
+        described_class.load_all
+      end
+    end
+  end
+end