Ensuring Merge Request API returns boolean values for work_in_progress

Fixes #14692

app/models/merge_request.rb

@@ -279,7 +279,7 @@ class MergeRequest < ActiveRecord::Base
   WIP_REGEX = /\A\s*(\[WIP\]\s*|WIP:\s*|WIP\s+)+\s*/i.freeze
 
   def work_in_progress?
-    title =~ WIP_REGEX
+    !!(title =~ WIP_REGEX)
   end
 
   def wipless_title

spec/models/merge_request_spec.rb

@@ -224,22 +224,22 @@ describe MergeRequest, models: true do
     ['WIP ', 'WIP:', 'WIP: ', '[WIP]', '[WIP] ', ' [WIP] WIP [WIP] WIP: WIP '].each do |wip_prefix|
       it "detects the '#{wip_prefix}' prefix" do
         subject.title = "#{wip_prefix}#{subject.title}"
-        expect(subject).to be_work_in_progress
+        expect(subject.work_in_progress?).to eq true
       end
     end
 
     it "doesn't detect WIP for words starting with WIP" do
       subject.title = "Wipwap #{subject.title}"
-      expect(subject).not_to be_work_in_progress
+      expect(subject.work_in_progress?).to eq false
     end
 
     it "doesn't detect WIP for words containing with WIP" do
       subject.title = "WupWipwap #{subject.title}"
-      expect(subject).not_to be_work_in_progress
+      expect(subject.work_in_progress?).to eq false
     end
 
     it "doesn't detect WIP by default" do
-      expect(subject).not_to be_work_in_progress
+      expect(subject.work_in_progress?).to eq false
     end
   end
 

spec/requests/api/merge_requests_spec.rb

@@ -118,6 +118,7 @@ describe API::API, api: true  do
       expect(response.status).to eq(200)
       expect(json_response['title']).to eq(merge_request.title)
       expect(json_response['iid']).to eq(merge_request.iid)
+      expect(json_response['work_in_progress']).to eq(false)
       expect(json_response['merge_status']).to eq('can_be_merged')
     end
 
@@ -133,6 +134,16 @@ describe API::API, api: true  do
       get api("/projects/#{project.id}/merge_requests/999", user)
       expect(response.status).to eq(404)
     end
+
+    context 'Work in Progress' do
+      let!(:merge_request_wip) { create(:merge_request, author: user, assignee: user, source_project: project, target_project: project, title: "WIP: Test", created_at: base_time + 1.second) }
+
+      it "should return merge_request" do
+        get api("/projects/#{project.id}/merge_requests/#{merge_request_wip.id}", user)
+        expect(response.status).to eq(200)
+        expect(json_response['work_in_progress']).to eq(true)
+      end
+    end
   end
 
   describe 'GET /projects/:id/merge_requests/:merge_request_id/commits' do