1 files changed, 42 insertions, 0 deletions
diff --git a/railties/test/minitest/rails_plugin_test.rb b/railties/test/minitest/rails_plugin_test.rb
new file mode 100644
index 0000000000..7c3a2022a9
--- /dev/null
+++ b/railties/test/minitest/rails_plugin_test.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+
+class Minitest::RailsPluginTest < ActiveSupport::TestCase
+  setup do
+    @options = Minitest.process_args []
+    @output = StringIO.new("".encode("UTF-8"))
+  end
+
+  test "default reporters are replaced" do
+    with_reporter Minitest::CompositeReporter.new do |reporter|
+      reporter << Minitest::SummaryReporter.new(@output, @options)
+      reporter << Minitest::ProgressReporter.new(@output, @options)
+      reporter << Minitest::Reporter.new(@output, @options)
+
+      Minitest.plugin_rails_init({})
+
+      assert_equal 3, reporter.reporters.count
+      assert reporter.reporters.any? { |candidate| candidate.kind_of?(Minitest::SuppressedSummaryReporter) }
+      assert reporter.reporters.any? { |candidate| candidate.kind_of?(::Rails::TestUnitReporter) }
+      assert reporter.reporters.any? { |candidate| candidate.kind_of?(Minitest::Reporter) }
+    end
+  end
+
+  test "no custom reporters are added if nothing to replace" do
+    with_reporter Minitest::CompositeReporter.new do |reporter|
+      Minitest.plugin_rails_init({})
+
+      assert_empty reporter.reporters
+    end
+  end
+
+  private
+    def with_reporter(reporter)
+      old_reporter, Minitest.reporter = Minitest.reporter, reporter
+
+      yield reporter
+    ensure
+      Minitest.reporter = old_reporter
+    end
+end