Test against all types and more status:

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7508#note_18748231

spec/models/concerns/has_status_spec.rb

@@ -124,12 +124,9 @@ describe HasStatus do
     end
   end
 
-  def self.random_type
-    %i[ci_build generic_commit_status].sample
-  end
-
   context 'for scope with one status' do
-    shared_examples 'having a job' do |type, status|
+    shared_examples 'having a job' do |status|
+      %i[ci_build generic_commit_status].each do |type|
         context "when it's #{status} #{type} job" do
           let!(:job) { create(type, status) }
 
@@ -153,15 +150,17 @@ describe HasStatus do
           end
         end
       end
+    end
 
     %i[created running pending success
        failed canceled skipped].each do |status|
-      it_behaves_like 'having a job', random_type, status
+      it_behaves_like 'having a job', status
     end
   end
 
   context 'for scope with more statuses' do
-    shared_examples 'containing the job' do |type, status|
+    shared_examples 'containing the job' do |status|
+      %i[ci_build generic_commit_status].each do |type|
         context "when it's #{status} #{type} job" do
           let!(:job) { create(type, status) }
 
@@ -170,8 +169,10 @@ describe HasStatus do
           end
         end
       end
+    end
 
-    shared_examples 'not containing the job' do |type, status|
+    shared_examples 'not containing the job' do |status|
+      %i[ci_build generic_commit_status].each do |type|
         context "when it's #{status} #{type} job" do
           let!(:job) { create(type, status) }
 
@@ -180,35 +181,42 @@ describe HasStatus do
           end
         end
       end
+    end
 
     describe '.running_or_pending' do
       subject { CommitStatus.running_or_pending }
 
       %i[running pending].each do |status|
-        it_behaves_like 'containing the job', random_type, status
+        it_behaves_like 'containing the job', status
       end
 
-      it_behaves_like 'not containing the job', random_type, :created
+      %i[created failed success].each do |status|
+        it_behaves_like 'not containing the job', status
+      end
     end
 
     describe '.finished' do
       subject { CommitStatus.finished }
 
       %i[success failed canceled].each do |status|
-        it_behaves_like 'containing the job', random_type, status
+        it_behaves_like 'containing the job', status
       end
 
-      it_behaves_like 'not containing the job', random_type, :created
+      %i[created running pending].each do |status|
+        it_behaves_like 'not containing the job', status
+      end
     end
 
     describe '.cancelable' do
       subject { CommitStatus.cancelable }
 
       %i[running pending created].each do |status|
-        it_behaves_like 'containing the job', random_type, status
+        it_behaves_like 'containing the job', status
       end
 
-      it_behaves_like 'not containing the job', random_type, :failed
+      %i[failed success skipped canceled].each do |status|
+        it_behaves_like 'not containing the job', status
+      end
     end
   end
 end