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    // Copyright 2015-2017 Parity Technologies (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/>.

    //! Test implementation of fetch client.

    use std::{io, thread};
    use futures::{self, Future};
    use fetch::{self, Fetch};

    /// Test implementation of fetcher. Will always return the same file.
    #[derive(Default, Clone)]
    pub struct TestFetch;

    impl Fetch for TestFetch {
    	type Result = futures::BoxFuture<fetch::Response, fetch::Error>;

    	fn new() -> Result<Self, fetch::Error> where Self: Sized {
    		Ok(TestFetch)
    	}

    	fn fetch_with_abort(&self, _url: &str, _abort: fetch::Abort) -> Self::Result {
    		let (tx, rx) = futures::oneshot();
    		thread::spawn(move || {
    			let cursor = io::Cursor::new(b"Some content");
    			tx.complete(fetch::Response::from_reader(cursor));
    		});

    		rx.map_err(|_| fetch::Error::Aborted).boxed()
    	}
    }

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