Exit with a failure if any test files failed to load

2 files changed, 24 insertions, 0 deletions

diff --git a/tool/test/testunit/test4test_load_failure.rb b/tool/test/testunit/test4test_load_failure.rb
new file mode 100644
index 0000000000..e1570c2542
--- /dev/null
+++ b/tool/test/testunit/test4test_load_failure.rb
@@ -0,0 +1 @@
+raise LoadError, "no-such-library"
diff --git a/tool/test/testunit/test_load_failure.rb b/tool/test/testunit/test_load_failure.rb
new file mode 100644
index 0000000000..63db33fd2c
--- /dev/null
+++ b/tool/test/testunit/test_load_failure.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+require 'test/unit'
+
+class TestLoadFailure < Test::Unit::TestCase
+  def test_load_failure
+    assert_not_predicate(load_failure, :success?)
+  end
+
+  def test_load_failure_parallel
+    assert_not_predicate(load_failure("-j2"), :success?)
+  end
+
+  private
+
+  def load_failure(*args)
+    IO.popen([*@options[:ruby], "#{__dir__}/../runner.rb",
+              "#{__dir__}/test4test_load_failure.rb",
+              "--verbose", *args], err: [:child, :out]) {|f|
+      assert_include(f.read, "test4test_load_failure.rb")
+    }
+    $?
+  end
+end