1 files changed, 49 insertions, 0 deletions
diff --git a/actionmailer/test/assert_select_email_test.rb b/actionmailer/test/assert_select_email_test.rb
new file mode 100644
index 0000000000..9699fe4000
--- /dev/null
+++ b/actionmailer/test/assert_select_email_test.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+
+class AssertSelectEmailTest < ActionMailer::TestCase
+  class AssertSelectMailer < ActionMailer::Base
+    def test(html)
+      mail body: html, content_type: "text/html",
+        subject: "Test e-mail", from: "test@test.host", to: "test <test@test.host>"
+    end
+  end
+
+  class AssertMultipartSelectMailer < ActionMailer::Base
+    def test(options)
+      mail subject: "Test e-mail", from: "test@test.host", to: "test <test@test.host>" do |format|
+        format.text { render plain: options[:text] }
+        format.html { render plain: options[:html] }
+      end
+    end
+  end
+
+  #
+  # Test assert_select_email
+  #
+
+  def test_assert_select_email
+    assert_raise ActiveSupport::TestCase::Assertion do
+      assert_select_email { }
+    end
+
+    AssertSelectMailer.test("<div><p>foo</p><p>bar</p></div>").deliver_now
+    assert_select_email do
+      assert_select "div:root" do
+        assert_select "p:first-child", "foo"
+        assert_select "p:last-child", "bar"
+      end
+    end
+  end
+
+  def test_assert_select_email_multipart
+    AssertMultipartSelectMailer.test(html: "<div><p>foo</p><p>bar</p></div>", text: "foo bar").deliver_now
+    assert_select_email do
+      assert_select "div:root" do
+        assert_select "p:first-child", "foo"
+        assert_select "p:last-child", "bar"
+      end
+    end
+  end
+end