Add k8s namespace implementation and tests

1 files changed, 66 insertions, 0 deletions

diff --git a/spec/lib/gitlab/kubernetes/namespace_spec.rb b/spec/lib/gitlab/kubernetes/namespace_spec.rb
new file mode 100644
index 00000000000..b3c987f9344
--- /dev/null
+++ b/spec/lib/gitlab/kubernetes/namespace_spec.rb
@@ -0,0 +1,66 @@
+require 'spec_helper'
+
+describe Gitlab::Kubernetes::Namespace do
+  let(:name) { 'a_namespace' }
+  let(:client) { double('kubernetes client') }
+  subject { described_class.new(name, client) }
+
+  it { expect(subject.name).to eq(name) }
+
+  describe '#exists?' do
+    context 'when namespace do not exits' do
+      let(:exception) { ::KubeException.new(404, "namespace #{name} not found", nil) }
+
+      it 'returns false' do
+        expect(client).to receive(:get_namespace).with(name).once.and_raise(exception)
+
+        expect(subject.exists?).to be_falsey
+      end
+    end
+
+    context 'when namespace exits' do
+      let(:namespace) { ::Kubeclient::Resource.new(kind: 'Namespace', metadata: { name: name }) } # partial representation
+
+      it 'returns true' do
+        expect(client).to receive(:get_namespace).with(name).once.and_return(namespace)
+
+        expect(subject.exists?).to be_truthy
+      end
+    end
+
+    context 'when cluster cannot be reached' do
+      let(:exception) { Errno::ECONNREFUSED.new }
+
+      it 'raises exception' do
+        expect(client).to receive(:get_namespace).with(name).once.and_raise(exception)
+
+        expect { subject.exists? }.to raise_error(exception)
+      end
+    end
+  end
+
+  describe '#create!' do
+    it 'creates a namespace' do
+      matcher = have_attributes(metadata: have_attributes(name: name))
+      expect(client).to receive(:create_namespace).with(matcher).once
+
+      expect { subject.create! }.not_to raise_error
+    end
+  end
+
+  describe '#ensure_exists!' do
+    it 'checks for existing namespace before creating' do
+      expect(subject).to receive(:exists?).once.ordered.and_return(false)
+      expect(subject).to receive(:create!).once.ordered
+
+      subject.ensure_exists!
+    end
+
+    it 'do not re-create an existing namespace' do
+      expect(subject).to receive(:exists?).once.and_return(true)
+      expect(subject).not_to receive(:create!)
+
+      subject.ensure_exists!
+    end
+  end
+end