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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::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
    use semver::Version;
    use updater::{Service as UpdateService, CapState, ReleaseInfo, VersionInfo, OperationsInfo, ReleaseTrack};

    /// Test implementation of fetcher. Will always return the same file.
    #[derive(Default)]
    pub struct TestUpdater {
    	updated: AtomicBool,
    	current_block: AtomicUsize,
    }

    impl TestUpdater {
    	/// Update the (faked) current block.
    	pub fn set_current_block(&self, n: usize) {
    		self.current_block.store(n, Ordering::Relaxed);
    	}

    	/// Update the (faked) current block.
    	pub fn set_updated(&self, v: bool) {
    		self.updated.store(v, Ordering::Relaxed);
    	}
    }

    impl UpdateService for TestUpdater {
    	fn capability(&self) -> CapState {
    		if self.updated.load(Ordering::Relaxed) {
    			CapState::Capable
    		} else {
    			if self.current_block.load(Ordering::Relaxed) < 15100 {
    				CapState::CapableUntil(15100)
    			} else {
    				CapState::IncapableSince(15100)
    			}
    		}
    	}

    	fn upgrade_ready(&self) -> Option<ReleaseInfo> {
    		if self.updated.load(Ordering::Relaxed) {
    			None
    		} else {
    			self.info().map(|i| i.track)
    		}
    	}

    	fn execute_upgrade(&self) -> bool {
    		if self.updated.load(Ordering::Relaxed) {
    			false
    		} else {
    			self.updated.store(true, Ordering::Relaxed);
    			true
    		}
    	}

    	fn version_info(&self) -> VersionInfo {
    		VersionInfo {
    			track: ReleaseTrack::Beta,
    			version: Version{major: 1, minor: 5, patch: 0, build: vec![], pre: vec![]},
    			hash: 150.into(),
    		}
    	}

    	fn info(&self) -> Option<OperationsInfo> {
    		Some(OperationsInfo {
    			fork: 15100,
    			this_fork: Some(15000),
    			track: ReleaseInfo {
    				version: VersionInfo {
    					track: ReleaseTrack::Beta,
    					version: Version{major: 1, minor: 5, patch: 1, build: vec![], pre: vec![]},
    					hash: 151.into(),
    				},
    				is_critical: true,
    				fork: 15100,
    				binary: Some(1510.into()),
    			},
    			minor: None,
    		})
    	}
    }

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