Add specs for new Note and DiffNote methods.

app/models/diff_note.rb

@@ -107,6 +107,9 @@ class DiffNote < Note
     return unless resolvable?
 
     discussion_notes = self.noteable.notes.fresh.select { |n| n.discussion_id == self.discussion_id }
+
+    return if discussion_notes.empty?
+
     Discussion.new(discussion_notes)
   end
 

spec/models/diff_note_spec.rb

@@ -188,4 +188,250 @@ describe DiffNote, models: true do
       end
     end
   end
+
+  describe "#resolvable?" do
+    context "when noteable is a commit" do
+      subject { create(:diff_note_on_commit, project: project, position: position) }
+
+      it "returns false" do
+        expect(subject.resolvable?).to be false
+      end
+    end
+
+    context "when noteable is a merge request" do
+      context "when a system note" do
+        before do
+          subject.system = true
+        end
+
+        it "returns false" do
+          expect(subject.resolvable?).to be false
+        end
+      end
+
+      context "when a regular note" do
+        it "returns true" do
+          expect(subject.resolvable?).to be true
+        end
+      end
+    end
+  end
+
+  describe "#to_be_resolved?" do
+    context "when not resolvable" do
+      before do
+        allow(subject).to receive(:resolvable?).and_return(false)
+      end
+
+      it "returns false" do
+        expect(subject.to_be_resolved?).to be false
+      end
+    end
+
+    context "when resolvable" do
+      before do
+        allow(subject).to receive(:resolvable?).and_return(true)
+      end
+
+      context "when resolved" do
+        before do
+          allow(subject).to receive(:resolved?).and_return(true)
+        end
+
+        it "returns false" do
+          expect(subject.to_be_resolved?).to be false
+        end
+      end
+
+      context "when not resolved" do
+        before do
+          allow(subject).to receive(:resolved?).and_return(false)
+        end
+
+        it "returns true" do
+          expect(subject.to_be_resolved?).to be true
+        end
+      end
+    end
+  end
+
+  describe "#resolve!" do
+    let(:current_user) { create(:user) }
+
+    context "when not resolvable" do
+      before do
+        allow(subject).to receive(:resolvable?).and_return(false)
+      end
+
+      it "returns nil" do
+        expect(subject.resolve!(current_user)).to be_nil
+      end
+
+      it "doesn't set resolved_at" do
+        subject.resolve!(current_user)
+
+        expect(subject.resolved_at).to be_nil
+      end
+
+      it "doesn't set resolved_by" do
+        subject.resolve!(current_user)
+
+        expect(subject.resolved_by).to be_nil
+      end
+
+      it "doesn't mark as resolved" do
+        subject.resolve!(current_user)
+
+        expect(subject.resolved?).to be false
+      end
+    end
+
+    context "when resolvable" do
+      before do
+        allow(subject).to receive(:resolvable?).and_return(true)
+      end
+
+      context "when already resolved" do
+        let(:user) { create(:user) }
+
+        before do
+          subject.resolve!(user)
+        end
+
+        it "returns nil" do
+          expect(subject.resolve!(current_user)).to be_nil
+        end
+
+        it "doesn't change resolved_at" do
+          expect(subject.resolved_at).not_to be_nil
+
+          expect { subject.resolve!(current_user) }.not_to change { subject.resolved_at }
+        end
+
+        it "doesn't change resolved_by" do
+          expect(subject.resolved_by).to eq(user)
+
+          expect { subject.resolve!(current_user) }.not_to change { subject.resolved_by }
+        end
+
+        it "doesn't change resolved status" do
+          expect(subject.resolved?).to be true
+
+          expect { subject.resolve!(current_user) }.not_to change { subject.resolved? }
+        end
+      end
+
+      context "when not yet resolved" do
+        it "returns true" do
+          expect(subject.resolve!(current_user)).to be true
+        end
+
+        it "sets resolved_at" do
+          subject.resolve!(current_user)
+
+          expect(subject.resolved_at).not_to be_nil
+        end
+
+        it "sets resolved_by" do
+          subject.resolve!(current_user)
+
+          expect(subject.resolved_by).to eq(current_user)
+        end
+
+        it "marks as resolved" do
+          subject.resolve!(current_user)
+
+          expect(subject.resolved?).to be true
+        end
+      end
+    end
+  end
+
+  describe "#unresolve!" do
+    context "when not resolvable" do
+      before do
+        allow(subject).to receive(:resolvable?).and_return(false)
+      end
+
+      it "returns nil" do
+        expect(subject.unresolve!).to be_nil
+      end
+    end
+
+    context "when resolvable" do
+      before do
+        allow(subject).to receive(:resolvable?).and_return(true)
+      end
+
+      context "when resolved" do
+        let(:user) { create(:user) }
+
+        before do
+          subject.resolve!(user)
+        end
+
+        it "returns true" do
+          expect(subject.unresolve!).to be true
+        end
+
+        it "unsets resolved_at" do
+          subject.unresolve!
+
+          expect(subject.resolved_at).to be_nil
+        end
+
+        it "unsets resolved_by" do
+          subject.unresolve!
+
+          expect(subject.resolved_by).to be_nil
+        end
+
+        it "unmarks as resolved" do
+          subject.unresolve!
+
+          expect(subject.resolved?).to be false
+        end
+      end
+
+      context "when not resolved" do
+        it "returns nil" do
+          expect(subject.unresolve!).to be_nil
+        end
+      end
+    end
+  end
+
+  describe "#discussion" do
+    context "when not resolvable" do
+      before do
+        allow(subject).to receive(:resolvable?).and_return(false)
+      end
+
+      it "returns nil" do
+        expect(subject.discussion).to be_nil
+      end
+    end
+
+    context "when resolvable" do
+      let!(:diff_note2) { create(:diff_note_on_merge_request, project: project, noteable: merge_request, position: subject.position) }
+      let!(:diff_note3) { create(:diff_note_on_merge_request, project: project, noteable: merge_request, position: active_position2) }
+
+      let(:active_position2) do
+        Gitlab::Diff::Position.new(
+          old_path: "files/ruby/popen.rb",
+          new_path: "files/ruby/popen.rb",
+          old_line: 16,
+          new_line: 22,
+          diff_refs: merge_request.diff_refs
+        )
+      end
+
+      it "returns the discussion this note is in" do
+        discussion = subject.discussion
+
+        expect(discussion.id).to eq(subject.discussion_id)
+        expect(discussion.notes).to eq([subject, diff_note2])
+      end
+    end
+  end
 end

spec/models/note_spec.rb

 require 'spec_helper'
 
 describe Note, models: true do
+  include RepoHelpers
+
   describe 'associations' do
     it { is_expected.to belong_to(:project) }
     it { is_expected.to belong_to(:noteable).touch(true) }
@@ -267,4 +269,56 @@ describe Note, models: true do
       expect(note.participants).to include(note.author)
     end
   end
+
+  describe ".grouped_diff_discussions" do
+    let!(:merge_request) { create(:merge_request) }
+    let(:project) { merge_request.project }
+    let!(:active_diff_note1) { create(:diff_note_on_merge_request, project: project, noteable: merge_request) }
+    let!(:active_diff_note2) { create(:diff_note_on_merge_request, project: project, noteable: merge_request) }
+    let!(:active_diff_note3) { create(:diff_note_on_merge_request, project: project, noteable: merge_request, position: active_position2) }
+    let!(:outdated_diff_note1) { create(:diff_note_on_merge_request, project: project, noteable: merge_request, position: outdated_position) }
+    let!(:outdated_diff_note2) { create(:diff_note_on_merge_request, project: project, noteable: merge_request, position: outdated_position) }
+
+    let(:active_position2) do
+      Gitlab::Diff::Position.new(
+        old_path: "files/ruby/popen.rb",
+        new_path: "files/ruby/popen.rb",
+        old_line: 16,
+        new_line: 22,
+        diff_refs: merge_request.diff_refs
+      )
+    end
+
+    let(:outdated_position) do
+      Gitlab::Diff::Position.new(
+        old_path: "files/ruby/popen.rb",
+        new_path: "files/ruby/popen.rb",
+        old_line: nil,
+        new_line: 9,
+        diff_refs: project.commit("874797c3a73b60d2187ed6e2fcabd289ff75171e").diff_refs
+      )
+    end
+
+    subject { merge_request.notes.grouped_diff_discussions }
+
+    it "includes active discussions" do
+      discussions = subject.values
+
+      expect(discussions.count).to eq(2)
+      expect(discussions.map(&:id)).to eq([active_diff_note1.discussion_id, active_diff_note3.discussion_id])
+      expect(discussions.all?(&:active?)).to be true
+
+      expect(discussions.first.notes).to eq([active_diff_note1, active_diff_note2])
+      expect(discussions.last.notes).to eq([active_diff_note3])
+    end
+
+    it "doesn't include outdated discussions" do
+      expect(subject.values.map(&:id)).not_to include(outdated_diff_note1.discussion_id)
+    end
+
+    it "groups the discussions by line code" do
+      expect(subject[active_diff_note1.line_code].id).to eq(active_diff_note1.discussion_id)
+      expect(subject[active_diff_note3.line_code].id).to eq(active_diff_note3.discussion_id)
+    end
+  end
 end