diff --git a/test/commands/traefik_test.rb b/test/commands/traefik_test.rb
index 5a651dee..7dfcff97 100644
--- a/test/commands/traefik_test.rb
+++ b/test/commands/traefik_test.rb
@@ -180,7 +180,7 @@ class CommandsTraefikTest < ActiveSupport::TestCase
   test "env_file" do
     @config[:traefik]["env"] = { "secret" => %w[EXAMPLE_API_KEY] }
 
-    assert_equal "EXAMPLE_API_KEY=456\n", new_command.env_file
+    assert_equal "EXAMPLE_API_KEY=456\n", new_command.env_file.to_s
   end
 
   test "host_env_file_path" do
diff --git a/test/configuration/role_test.rb b/test/configuration/role_test.rb
index 49396b74..6966e893 100644
--- a/test/configuration/role_test.rb
+++ b/test/configuration/role_test.rb
@@ -77,7 +77,7 @@ class ConfigurationRoleTest < ActiveSupport::TestCase
       WEB_CONCURRENCY=4
     ENV
 
-    assert_equal expected_env, @config_with_roles.role(:workers).env_file
+    assert_equal expected_env, @config_with_roles.role(:workers).env_file.to_s
   end
 
   test "container name" do
@@ -123,7 +123,7 @@ class ConfigurationRoleTest < ActiveSupport::TestCase
       WEB_CONCURRENCY=4
     ENV
 
-    assert_equal expected, @config_with_roles.role(:workers).env_file
+    assert_equal expected, @config_with_roles.role(:workers).env_file.to_s
   ensure
     ENV["REDIS_PASSWORD"] = nil
     ENV["DB_PASSWORD"] = nil
@@ -148,7 +148,7 @@ class ConfigurationRoleTest < ActiveSupport::TestCase
       WEB_CONCURRENCY=4
     ENV
 
-    assert_equal expected, @config_with_roles.role(:workers).env_file
+    assert_equal expected, @config_with_roles.role(:workers).env_file.to_s
   ensure
     ENV["DB_PASSWORD"] = nil
   end
@@ -171,7 +171,7 @@ class ConfigurationRoleTest < ActiveSupport::TestCase
       WEB_CONCURRENCY=4
     ENV
 
-    assert_equal expected, @config_with_roles.role(:workers).env_file
+    assert_equal expected, @config_with_roles.role(:workers).env_file.to_s
   ensure
     ENV["REDIS_PASSWORD"] = nil
   end