Do not overwrite secret token value when already present.

```
user = User.create(token: "custom-secure-token")
user.token # => "custom-secure-token"
```

1 files changed, 7 insertions, 0 deletions

diff --git a/activerecord/test/cases/secure_token_test.rb b/activerecord/test/cases/secure_token_test.rb
index 3f7455d12d..e731443fc2 100644
--- a/activerecord/test/cases/secure_token_test.rb
+++ b/activerecord/test/cases/secure_token_test.rb
@@ -22,4 +22,11 @@ class SecureTokenTest < ActiveRecord::TestCase
     assert_not_equal @user.token, old_token
     assert_not_equal @user.auth_token, old_auth_token
   end
+
+  def test_token_value_not_overwritten_when_present
+    @user.token = "custom-secure-token"
+    @user.save
+
+    assert_equal @user.token, "custom-secure-token"
+  end
 end