Gracefully handle non-existing failing test given to bisect

ruby/lib/ci/queue/bisect.rb

@@ -27,6 +27,10 @@ def failing_test
         Static.new([config.failing_test], config).populate(@all_tests)
       end
 
+      def failing_test_present?
+        @all_tests.find { |t| t.id == config.failing_test }
+      end
+
       def candidates
         Static.new(first_half + [config.failing_test], config).populate(@all_tests)
       end

ruby/lib/minitest/queue/runner.rb

@@ -189,6 +189,13 @@ def bisect_command
         populate_queue
 
         step("Testing the failing test in isolation")
+        unless queue.failing_test_present?
+          puts reopen_previous_step
+          puts red("The failing test does not exist.")
+          File.write('log/test_order.log', "")
+          exit! 1
+        end
+
         unless run_tests_in_fork(queue.failing_test)
           puts reopen_previous_step
           puts red("The test fail when ran alone, no need to bisect.")

ruby/test/integration/minitest_bisect_test.rb

@@ -286,6 +286,22 @@ def test_broken
       assert_equal expected_output, normalize(out)
     end
 
+    def test_failing_test_is_not_present
+      out, err = capture_subprocess_io do
+        run_bisect('log/leaky_test_order.log', 'LeakyTestDoesNotExist#test_sensible_to_leak')
+      end
+
+      assert_empty err
+      expected_output = strip_heredoc <<-EOS
+        --- Testing the failing test in isolation
+        ^^^ +++
+
+        The failing test does not exist.
+      EOS
+
+      assert_equal expected_output, normalize(out)
+    end
+
     private
 
     def normalize(output)