Add the merge_request_dependencies method

lib/gitlab/client/merge_requests.rb

@@ -59,6 +59,18 @@ def merge_request_pipelines(project, id)
       get("/projects/#{url_encode project}/merge_requests/#{id}/pipelines")
     end
 
+    # Shows information about the merge request dependencies that must be resolved before merging.
+    #
+    # @example
+    #   Gitlab.merge_request_dependencies(5, 36)
+    #
+    # @param  [Integer, String] project The ID or name of a project.
+    # @param  [Integer] id The ID of a merge request.
+    # @return [Array<Gitlab::ObjectifiedHash>]
+    def merge_request_dependencies(project, id)
+      get("/projects/#{url_encode project}/merge_requests/#{id}/blocks")
+    end
+
     # Create a new pipeline for a merge request.
     # A pipeline created via this endpoint doesnt run a regular branch/tag pipeline.
     # It requires .gitlab-ci.yml to be configured with only: [merge_requests] to create jobs.

spec/fixtures/merge_request_dependencies.json

@@ -0,0 +1 @@
+[{"id":1234,"blocking_merge_request":{"id":2,"target_branch":"master","source_branch":"api2","project_id":3,"title":"New feature 2","closed":false,"merged":false,"author":{"id":1,"email":"john@example.com","name":"John Smith","blocked":false,"created_at":"2012-10-19T05:56:05Z"},"assignee":{"id":2,"email":"jack@example.com","name":"Jack Smith","blocked":false,"created_at":"2012-10-19T05:56:14Z"}},"blocked_merge_request":{"id":1,"target_branch":"master","source_branch":"api","project_id":3,"title":"New feature","closed":false,"merged":false,"author":{"id":1,"email":"john@example.com","name":"John Smith","blocked":false,"created_at":"2012-10-19T05:56:05Z"},"assignee":{"id":2,"email":"jack@example.com","name":"Jack Smith","blocked":false,"created_at":"2012-10-19T05:56:14Z"}}}]

spec/gitlab/client/merge_requests_spec.rb

@@ -77,6 +77,22 @@
     end
   end
 
+  describe '.merge_request_dependencies' do
+    before do
+      stub_get('/projects/3/merge_requests/1/blocks', 'merge_request_dependencies')
+      @pipelines = Gitlab.merge_request_dependencies(3, 1)
+    end
+
+    it 'gets the correct resource' do
+      expect(a_get('/projects/3/merge_requests/1/blocks')).to have_been_made
+    end
+
+    it 'returns information about merge request dependencies' do
+      expect(@pipelines.first.id).to eq(1234)
+      expect(@pipelines.first.keys).to include('blocking_merge_request', 'blocked_merge_request')
+    end
+  end
+
   describe '.create_merge_request_pipeline' do
     before do
       stub_post('/projects/3/merge_requests/2/pipelines', 'pipeline_create')