Respect the inheritance chain between Ci::Build and CommitStatus

Also moves the assertions were they belong

app/presenters/ci/build_presenter.rb

 module Ci
-  class BuildPresenter < Gitlab::View::Presenter::Delegated
-    CALLOUT_FAILURE_MESSAGES = {
-      unknown_failure: 'There is an unknown failure, please try again',
-      script_failure: 'There has been a script failure. Check the job log for more information',
-      api_failure: 'There has been an API failure, please try again',
-      stuck_or_timeout_failure: 'There has been a timeout failure or the job got stuck. Check your timeout limits or try again',
-      runner_system_failure: 'There has been a runner system failure, please try again',
-      missing_dependency_failure: 'There has been a missing dependency failure, check the job log for more information'
-    }.freeze
-
-    presents :build
-
+  class BuildPresenter < CommitStatusPresenter
     def erased_by_user?
       # Build can be erased through API, therefore it does not have
       # `erased_by` user assigned in that case.
@@ -44,14 +33,6 @@ module Ci
       "#{subject.name} - #{detailed_status.status_tooltip}"
     end
 
-    def callout_failure_message
-      CALLOUT_FAILURE_MESSAGES[failure_reason.to_sym]
-    end
-
-    def recoverable?
-      failed? && !unrecoverable?
-    end
-
     private
 
     def tooltip_for_badge
@@ -61,9 +42,5 @@ module Ci
     def detailed_status
       @detailed_status ||= subject.detailed_status(user)
     end
-
-    def unrecoverable?
-      script_failure? || missing_dependency_failure?
-    end
   end
 end

app/presenters/commit_status_presenter.rb

-class CommitStatusPresenter < Ci::BuildPresenter
+class CommitStatusPresenter < Gitlab::View::Presenter::Delegated
+  CALLOUT_FAILURE_MESSAGES = {
+      unknown_failure: 'There is an unknown failure, please try again',
+      script_failure: 'There has been a script failure. Check the job log for more information',
+      api_failure: 'There has been an API failure, please try again',
+      stuck_or_timeout_failure: 'There has been a timeout failure or the job got stuck. Check your timeout limits or try again',
+      runner_system_failure: 'There has been a runner system failure, please try again',
+      missing_dependency_failure: 'There has been a missing dependency failure, check the job log for more information'
+  }.freeze
+
+  presents :build
+
+  def callout_failure_message
+    CALLOUT_FAILURE_MESSAGES[failure_reason.to_sym]
+  end
+
+  def recoverable?
+    failed? && !unrecoverable?
+  end
+
+  def unrecoverable?
+    script_failure? || missing_dependency_failure?
+  end
 end

spec/models/commit_status_spec.rb

@@ -567,11 +567,8 @@ describe CommitStatus do
   end
 
   describe '#present' do
-    let(:generic_commit_status) { create(:generic_commit_status) }
+    subject { commit_status.present }
 
-    it 'returns a presenter' do
-      expect(commit_status.present).to be_a(Ci::BuildPresenter)
-      expect(generic_commit_status.present).to be_a(Ci::BuildPresenter)
-    end
+    it { is_expected.to be_a(CommitStatusPresenter) }
   end
 end

spec/models/generic_commit_status_spec.rb

@@ -78,4 +78,10 @@ describe GenericCommitStatus do
       it { is_expected.not_to be_nil }
     end
   end
+
+  describe '#present' do
+    subject { generic_commit_status.present }
+
+    it { is_expected.to be_a(GenericCommitStatusPresenter) }
+  end
 end

spec/presenters/ci/build_presenter_spec.rb

@@ -10,7 +10,7 @@ describe Ci::BuildPresenter do
   end
 
   it 'inherits from Gitlab::View::Presenter::Delegated' do
-    expect(described_class.superclass).to eq(Gitlab::View::Presenter::Delegated)
+    expect(described_class.ancestors).to include(Gitlab::View::Presenter::Delegated)
   end
 
   describe '#initialize' do

spec/presenters/commit_status_presenter_spec.rb

+require 'spec_helper'
+
+describe CommitStatusPresenter do
+  let(:project) { create(:project) }
+  let(:pipeline) { create(:ci_pipeline, project: project) }
+  let(:build) { create(:ci_build, pipeline: pipeline) }
+
+  subject(:presenter) do
+    described_class.new(build)
+  end
+
+  it 'inherits from Gitlab::View::Presenter::Delegated' do
+    expect(described_class.superclass).to eq(Gitlab::View::Presenter::Delegated)
+  end
+end