Merge branch 'caalberts-fix-parallel-rspec-runner' into 'master'

Fix parallel_rspec_runner not to run all tests

See merge request gitlab-org/gitlab!48733

spec/tooling/lib/tooling/parallel_rspec_runner_spec.rb

@@ -43,6 +43,16 @@ RSpec.describe Tooling::ParallelRSpecRunner do # rubocop:disable RSpec/FilePath
 
         subject.run
       end
+
+      context 'when there is no intersect between allocated tests and filtered tests' do
+        let(:filter_tests) { '99_spec.rb' }
+
+        it 'does not run rspec' do
+          expect(subject).not_to receive(:exec)
+
+          subject.run
+        end
+      end
     end
 
     context 'with empty filter tests file' do

tooling/lib/tooling/parallel_rspec_runner.rb

@@ -38,6 +38,11 @@ module Tooling
       Knapsack.logger.info tests_to_run
       Knapsack.logger.info
 
+      if tests_to_run.empty?
+        Knapsack.logger.info 'No tests to run on this node, exiting.'
+        return
+      end
+
       exec(*rspec_command)
     end