1 files changed, 30 insertions, 0 deletions
diff --git a/activesupport/test/safe_buffer_test.rb b/activesupport/test/safe_buffer_test.rb
index 047b89be2a..4532152996 100644
--- a/activesupport/test/safe_buffer_test.rb
+++ b/activesupport/test/safe_buffer_test.rb
@@ -140,4 +140,34 @@ class SafeBufferTest < ActiveSupport::TestCase
     # should still be unsafe
     assert !y.html_safe?, "should not be safe"
   end
+
+  test 'Should work with interpolation (array argument)' do
+    x = 'foo %s bar'.html_safe % ['qux']
+    assert_equal 'foo qux bar', x
+  end
+
+  test 'Should work with interpolation (hash argument)' do
+    x = 'foo %{x} bar'.html_safe % { x: 'qux' }
+    assert_equal 'foo qux bar', x
+  end
+
+  test 'Should escape unsafe interpolated args' do
+    x = 'foo %{x} bar'.html_safe % { x: '<br/>' }
+    assert_equal 'foo &lt;br/&gt; bar', x
+  end
+
+  test 'Should not escape safe interpolated args' do
+    x = 'foo %{x} bar'.html_safe % { x: '<br/>'.html_safe }
+    assert_equal 'foo <br/> bar', x
+  end
+
+  test 'Should interpolate to a safe string' do
+    x = 'foo %{x} bar'.html_safe % { x: 'qux' }
+    assert x.html_safe?, 'should be safe'
+  end
+
+  test 'Should not affect frozen objects when accessing characters' do
+    x = 'Hello'.html_safe
+    assert_equal x[/a/, 1], nil
+  end
 end