1 // Copyright 2024 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 // The Rust test framework uses `set_output_capture()` to redirect stdio output. 16 // Since we need to capture stdout in this test, we must use this API as well. 17 #![feature(internal_output_capture)] 18 mod backend_tests; 19 20 // Runs `action` while capturing `println!` output and returns the 21 // captured output. 22 #[cfg(test)] run_with_capture<F: FnOnce()>(action: F) -> String23fn run_with_capture<F: FnOnce()>(action: F) -> String { 24 // Use statements here instead of at the module level to scope them to the 25 // above #[cfg(test)] 26 use std::sync::{Arc, Mutex}; 27 28 let output = Arc::new(Mutex::new(Vec::new())); 29 let old_capture = std::io::set_output_capture(Some(output.clone())); 30 31 action(); 32 33 std::io::set_output_capture(old_capture); 34 let output_data = output.lock().unwrap(); 35 String::from_utf8((*output_data).to_vec()).unwrap() 36 } 37