dev/test tools to separate crate

devtools/src/lib.rs

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+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! dev-tools
+
+
+extern crate rand;
+
+pub mod random_path;
+
+pub use random_path::*;

devtools/src/random_path.rs

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+use std::path::*;
+use std::fs;
+use std::env;
+use rand::random;
+
+pub struct RandomTempPath {
+	path: PathBuf
+}
+
+pub fn random_filename() -> String {
+	(0..8).map(|_| ((random::<f32>() * 26.0) as u8 + 97) as char).collect()
+}
+
+impl RandomTempPath {
+	pub fn new() -> RandomTempPath {
+		let mut dir = env::temp_dir();
+		dir.push(random_filename());
+		RandomTempPath {
+			path: dir.clone()
+		}
+	}
+
+	pub fn create_dir() -> RandomTempPath {
+		let mut dir = env::temp_dir();
+		dir.push(random_filename());
+		fs::create_dir_all(dir.as_path()).unwrap();
+		RandomTempPath {
+			path: dir.clone()
+		}
+	}
+
+	pub fn as_path(&self) -> &PathBuf {
+		&self.path
+	}
+
+	pub fn as_str(&self) -> &str {
+		self.path.to_str().unwrap()
+	}
+}
+
+impl Drop for RandomTempPath {
+	fn drop(&mut self) {
+		if let Err(e) = fs::remove_dir_all(self.as_path()) {
+			panic!("failed to remove temp directory, probably something failed to destroyed ({})", e);
+		}
+	}
+}
+
+#[test]
+fn creates_dir() {
+	let temp = RandomTempPath::create_dir();
+	assert!(fs::metadata(temp.as_path()).unwrap().is_dir());
+}
+
+#[test]
+fn destroys_dir() {
+	let path_buf = {
+		let temp = RandomTempPath::create_dir();
+		assert!(fs::metadata(temp.as_path()).unwrap().is_dir());
+		let path_buf = temp.as_path().to_path_buf();
+		path_buf
+	};
+
+	assert!(fs::metadata(&path_buf).is_err());
+}
+
+#[test]
+fn provides_random() {
+	let temp = RandomTempPath::create_dir();
+	assert!(temp.as_path().to_str().is_some());
+}