1 files changed, 38 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..423e74fc66
--- /dev/null
+++ b/railties/test/minitest/rails_plugin_test.rb
@@ -0,0 +1,38 @@
+# 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
+    reporter = Minitest::CompositeReporter.new
+    reporter << Minitest::SummaryReporter.new(@output, @options)
+    reporter << Minitest::ProgressReporter.new(@output, @options)
+    reporter << Minitest::Reporter.new(@output, @options)
+
+    Minitest::plugin_rails_replace_reporters(reporter, {})
+
+    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
+
+  test "no custom reporters are added if nothing to replace" do
+    reporter = Minitest::CompositeReporter.new
+
+    Minitest::plugin_rails_replace_reporters(reporter, {})
+
+    assert_equal 0, reporter.reporters.count
+  end
+
+  test "handle the case when reporter is not CompositeReporter" do
+    reporter = Minitest::Reporter.new
+
+    Minitest::plugin_rails_replace_reporters(reporter, {})
+  end
+end