# Adding new test files | |
New test files must be in the `fidl_test` package, and have a `_test.go` | |
suffix in the file name. | |
Adding a non `_test.go` file with `package fidl_test` will result in | |
error messages about declaring multiple packages (`fidl` and `fidl_test`) | |
because Go strips the `_test` suffix from packages in `_test.go` | |
files only, when there are non `_test.go` files in the directory. |