1 files changed, 113 insertions, 0 deletions
diff --git a/spec/lib/gitlab/downtime_check_spec.rb b/spec/lib/gitlab/downtime_check_spec.rb
new file mode 100644
index 00000000000..42d895e548e
--- /dev/null
+++ b/spec/lib/gitlab/downtime_check_spec.rb
@@ -0,0 +1,113 @@
+require 'spec_helper'
+
+describe Gitlab::DowntimeCheck do
+  subject { described_class.new }
+  let(:path) { 'foo.rb' }
+
+  describe '#check' do
+    before do
+      expect(subject).to receive(:require).with(path)
+    end
+
+    context 'when a migration does not specify if downtime is required' do
+      it 'raises RuntimeError' do
+        expect(subject).to receive(:class_for_migration_file).
+          with(path).
+          and_return(Class.new)
+
+        expect { subject.check([path]) }.
+          to raise_error(RuntimeError, /it requires downtime/)
+      end
+    end
+
+    context 'when a migration requires downtime' do
+      context 'when no reason is specified' do
+        it 'raises RuntimeError' do
+          stub_const('TestMigration::DOWNTIME', true)
+
+          expect(subject).to receive(:class_for_migration_file).
+            with(path).
+            and_return(TestMigration)
+
+          expect { subject.check([path]) }.
+            to raise_error(RuntimeError, /no reason was given/)
+        end
+      end
+
+      context 'when a reason is specified' do
+        it 'returns an Array of messages' do
+          stub_const('TestMigration::DOWNTIME', true)
+          stub_const('TestMigration::DOWNTIME_REASON', 'foo')
+
+          expect(subject).to receive(:class_for_migration_file).
+            with(path).
+            and_return(TestMigration)
+
+          messages = subject.check([path])
+
+          expect(messages).to be_an_instance_of(Array)
+          expect(messages[0]).to be_an_instance_of(Gitlab::DowntimeCheck::Message)
+
+          message = messages[0]
+
+          expect(message.path).to eq(path)
+          expect(message.offline).to eq(true)
+          expect(message.reason).to eq('foo')
+        end
+      end
+    end
+  end
+
+  describe '#check_and_print' do
+    it 'checks the migrations and prints the results to STDOUT' do
+      stub_const('TestMigration::DOWNTIME', true)
+      stub_const('TestMigration::DOWNTIME_REASON', 'foo')
+
+      expect(subject).to receive(:require).with(path)
+
+      expect(subject).to receive(:class_for_migration_file).
+        with(path).
+        and_return(TestMigration)
+
+      expect(subject).to receive(:puts).with(an_instance_of(String))
+
+      subject.check_and_print([path])
+    end
+  end
+
+  describe '#class_for_migration_file' do
+    it 'returns the class for a migration file path' do
+      expect(subject.class_for_migration_file('123_string.rb')).to eq(String)
+    end
+  end
+
+  describe '#online?' do
+    it 'returns true when a migration can be performed online' do
+      stub_const('TestMigration::DOWNTIME', false)
+
+      expect(subject.online?(TestMigration)).to eq(true)
+    end
+
+    it 'returns false when a migration can not be performed online' do
+      stub_const('TestMigration::DOWNTIME', true)
+
+      expect(subject.online?(TestMigration)).to eq(false)
+    end
+  end
+
+  describe '#downtime_reason' do
+    context 'when a reason is defined' do
+      it 'returns the downtime reason' do
+        stub_const('TestMigration::DOWNTIME_REASON', 'hello')
+
+        expect(subject.downtime_reason(TestMigration)).to eq('hello')
+      end
+    end
+
+    context 'when a reason is not defined' do
+      it 'returns nil' do
+        expect(subject.downtime_reason(Class.new)).to be_nil
+      end
+    end
+  end
+end