Fix `ERB.new` argument deprecated warning

This fixes following warning.

```
warning: Passing safe_level with the 2nd argument of ERB.new is deprecated. Do not use it, and specify other arguments as keyword arguments.
```

1 files changed, 5 insertions, 1 deletions

diff --git a/railties/test/generators/generators_test_helper.rb b/railties/test/generators/generators_test_helper.rb
index 975a204af4..8b42cb83db 100644
--- a/railties/test/generators/generators_test_helper.rb
+++ b/railties/test/generators/generators_test_helper.rb
@@ -79,7 +79,11 @@ module GeneratorsTestHelper
   end
 
   def evaluate_template(file, locals = {})
-    erb = ERB.new(File.read(file), nil, "-", "@output_buffer")
+    erb = if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
+      ERB.new(File.read(file), trim_mode: "-", eoutvar: "@output_buffer")
+    else
+      ERB.new(File.read(file), nil, "-", "@output_buffer")
+    end
     context = Class.new do
       locals.each do |local, value|
         class_attribute local, default: value