Add a close issue slack slash command

Adds a slash command in slach for closing issues. See
https://docs.gitlab.com/ee/integration/slash_commands.html
for documentation on the wider feature set.

2 files changed, 107 insertions, 0 deletions

diff --git a/spec/lib/gitlab/slash_commands/issue_close_spec.rb b/spec/lib/gitlab/slash_commands/issue_close_spec.rb
new file mode 100644
index 00000000000..c0760ce0ba6
--- /dev/null
+++ b/spec/lib/gitlab/slash_commands/issue_close_spec.rb
@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::SlashCommands::IssueClose do
+  describe '#execute' do
+    let(:issue) { create(:issue, project: project) }
+    let(:project) { create(:project) }
+    let(:user) { issue.author }
+    let(:chat_name) { double(:chat_name, user: user) }
+    let(:regex_match) { described_class.match("issue close #{issue.iid}") }
+
+    subject do
+      described_class.new(project, chat_name).execute(regex_match)
+    end
+
+    context 'when the user does not have permission' do
+      let(:chat_name) { double(:chat_name, user: create(:user)) }
+
+      it 'does not allow the user to close the issue' do
+        expect(subject[:response_type]).to be(:ephemeral)
+        expect(subject[:text]).to match("not found")
+        expect(issue.reload).to be_open
+      end
+    end
+
+    context 'the issue exists' do
+      let(:title) { subject[:attachments].first[:title] }
+
+      it 'closes and returns the issue' do
+        expect(subject[:response_type]).to be(:in_channel)
+        expect(issue.reload).to be_closed
+        expect(title).to start_with(issue.title)
+      end
+
+      context 'when its reference is given' do
+        let(:regex_match) { described_class.match("issue close #{issue.to_reference}") }
+
+        it 'closes and returns the issue' do
+          expect(subject[:response_type]).to be(:in_channel)
+          expect(issue.reload).to be_closed
+          expect(title).to start_with(issue.title)
+        end
+      end
+    end
+
+    context 'the issue does not exist' do
+      let(:regex_match) { described_class.match("issue close 2343242") }
+
+      it "returns not found" do
+        expect(subject[:response_type]).to be(:ephemeral)
+        expect(subject[:text]).to match("not found")
+      end
+    end
+
+    context 'when the issue is already closed' do
+      let(:issue) { create(:issue, :closed, project: project) }
+
+      it 'shows the issue' do
+        expect(subject[:response_type]).to be(:ephemeral)
+        expect(issue.reload).to be_closed
+        expect(subject[:text]).to match("already closed")
+      end
+    end
+  end
+
+  describe '.match' do
+    it 'matches the iid' do
+      match = described_class.match("issue close 123")
+
+      expect(match[:iid]).to eq("123")
+    end
+
+    it 'accepts a reference' do
+      match = described_class.match("issue close #{Issue.reference_prefix}123")
+
+      expect(match[:iid]).to eq("123")
+    end
+  end
+end
diff --git a/spec/lib/gitlab/slash_commands/presenters/issue_close_spec.rb b/spec/lib/gitlab/slash_commands/presenters/issue_close_spec.rb
new file mode 100644
index 00000000000..adc13b4ee56
--- /dev/null
+++ b/spec/lib/gitlab/slash_commands/presenters/issue_close_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::SlashCommands::Presenters::IssueClose do
+  let(:project) { create(:project) }
+  let(:issue) { create(:issue, project: project) }
+  let(:attachment) { subject[:attachments].first }
+
+  subject { described_class.new(issue).present }
+
+  it { is_expected.to be_a(Hash) }
+
+  it 'shows the issue' do
+    expect(subject[:response_type]).to be(:in_channel)
+    expect(subject).to have_key(:attachments)
+    expect(attachment[:title]).to start_with(issue.title)
+  end
+
+  context 'confidential issue' do
+    let(:issue) { create(:issue, :confidential, project: project) }
+
+    it 'shows an ephemeral response' do
+      expect(subject[:response_type]).to be(:ephemeral)
+    end
+  end
+end