integration_tests.rs

		// A bid for another para is counted separately.
		assert_ok!(Auctions::bid(
			Origin::signed(10),
			ParaId::from(2001),
			1, // Auction Index
			lease_period_index_start + 1, // First Slot
			lease_period_index_start + 1, // Last slot
			555, // Amount
		));
		assert_eq!(Balances::reserved_balance(&10), 400 + 555);

		// Slot 2 for 800 from 20, overtaking 10's bid
		assert_ok!(Auctions::bid(
			Origin::signed(20),
			ParaId::from(2000),
			1, // Auction Index
			lease_period_index_start + 1, // First Slot
			lease_period_index_start + 1, // Last slot
			800, // Amount
		));
		// Slot 3 for 200 from 20
		assert_ok!(Auctions::bid(
			Origin::signed(20),
			ParaId::from(2000),
			1, // Auction Index
			lease_period_index_start + 2, // First Slot
			lease_period_index_start + 2, // Last slot
			200, // Amount
		));

		// Finish the auction
		run_to_block(110);

		// Should have won the lease periods
		assert_eq!(
			slots::Leases::<Test>::get(ParaId::from(2000)),
			// -- 1 --- 2 --- 3 ---------- 4 -------------- 5 -------------- 6 -------------- 7 -------
			vec![None, None, None, Some((10, 100)), Some((20, 800)), Some((20, 200)), Some((10, 400))],
		);
		// Appropriate amount is reserved (largest of the values)
		assert_eq!(Balances::reserved_balance(&10), 400);
		// Appropriate amount is reserved (largest of the values)
		assert_eq!(Balances::reserved_balance(&20), 800);

		// Progress through the leases and note the correct amount of balance is reserved.

		run_to_block(400);
		assert_eq!(
			slots::Leases::<Test>::get(ParaId::from(2000)),
			// --------- 4 -------------- 5 -------------- 6 -------------- 7 -------
			vec![Some((10, 100)), Some((20, 800)), Some((20, 200)), Some((10, 400))],
		);
		// Nothing changed.
		assert_eq!(Balances::reserved_balance(&10), 400);
		assert_eq!(Balances::reserved_balance(&20), 800);

		// Lease period 4 is done, but nothing is unreserved since user 1 has a debt on lease 7
		run_to_block(500);
		assert_eq!(
			slots::Leases::<Test>::get(ParaId::from(2000)),
			// --------- 5 -------------- 6 -------------- 7 -------
			vec![Some((20, 800)), Some((20, 200)), Some((10, 400))],
		);
		// Nothing changed.
		assert_eq!(Balances::reserved_balance(&10), 400);
		assert_eq!(Balances::reserved_balance(&20), 800);

		// Lease period 5 is done, and 20 will unreserve down to 200.
		run_to_block(600);
		assert_eq!(
			slots::Leases::<Test>::get(ParaId::from(2000)),
			// --------- 6 -------------- 7 -------
			vec![Some((20, 200)), Some((10, 400))],
		);
		assert_eq!(Balances::reserved_balance(&10), 400);
		assert_eq!(Balances::reserved_balance(&20), 200);

		// Lease period 6 is done, and 20 will unreserve everything.
		run_to_block(700);
		assert_eq!(
			slots::Leases::<Test>::get(ParaId::from(2000)),
			// --------- 7 -------
			vec![Some((10, 400))],
		);
		assert_eq!(Balances::reserved_balance(&10), 400);
		assert_eq!(Balances::reserved_balance(&20), 0);

		// All leases are done. Everything is unreserved.
		run_to_block(800);
		assert_eq!(slots::Leases::<Test>::get(ParaId::from(2000)), vec![]);
		assert_eq!(Balances::reserved_balance(&10), 0);
		assert_eq!(Balances::reserved_balance(&20), 0);
	});
}

// This test verifies that if a parachain already has won some lease periods, that it cannot bid for
// any of those same lease periods again.
#[test]
fn cant_bid_on_existing_lease_periods() {
	new_test_ext().execute_with(|| {
		assert!(System::block_number().is_one()); // So events are emitted
		Balances::make_free_balance_be(&1, 1_000_000_000);
		// First register a parathread
		assert_ok!(Registrar::reserve(Origin::signed(1)));
		assert_ok!(Registrar::register(
			Origin::signed(1),
			ParaId::from(2000),
			test_genesis_head(10),
			test_validation_code(10),
		));

		// Start a new auction in the future
		let starting_block = System::block_number();
		let duration = 99u32;
		let lease_period_index_start = 4u32;
		assert_ok!(Auctions::new_auction(Origin::root(), duration, lease_period_index_start));

		// 2 sessions later they are parathreads
		run_to_session(2);

		// Open a crowdloan for Para 1 for slots 0-3
		assert_ok!(Crowdloan::create(
			Origin::signed(1),
			ParaId::from(2000),
			1_000_000, // Cap
			lease_period_index_start + 0, // First Slot
			lease_period_index_start + 1, // Last Slot
			400, // Long block end
			None,
		));
		let crowdloan_account = Crowdloan::fund_account_id(ParaId::from(2000));

		// Bunch of contributions
		let mut total = 0;
		for i in 10 .. 20 {
			Balances::make_free_balance_be(&i, 1_000_000_000);
			assert_ok!(Crowdloan::contribute(Origin::signed(i), ParaId::from(2000), 900 - i, None));
			total += 900 - i;
		}
		assert!(total > 0);
		assert_eq!(Balances::free_balance(&crowdloan_account), total);

		// Finish the auction.
		run_to_block(starting_block + 110);

		// Appropriate Paras should have won slots
		assert_eq!(
			slots::Leases::<Test>::get(ParaId::from(2000)),
			// -- 1 --- 2 --- 3 ------------- 4 ------------------------ 5 -------------
			vec![None, None, None, Some((crowdloan_account, 8855)), Some((crowdloan_account, 8855))],
		);

		// Let's start another auction for the same range
		let starting_block = System::block_number();
		let duration = 99u32;
		let lease_period_index_start = 4u32;
		assert_ok!(Auctions::new_auction(Origin::root(), duration, lease_period_index_start));

		// Poke the crowdloan into `NewRaise`
		assert_ok!(Crowdloan::poke(Origin::signed(1), ParaId::from(2000)));
		assert_eq!(Crowdloan::new_raise(), vec![ParaId::from(2000)]);

		// Beginning of ending block.
		run_to_block(starting_block + 100);

		// Bids cannot be made which intersect
		assert_noop!(
			Auctions::bid(
				Origin::signed(crowdloan_account),
				ParaId::from(2000),
				2,
				lease_period_index_start + 0,
				lease_period_index_start + 1,
				100,
			), AuctionsError::<Test>::AlreadyLeasedOut,
		);

		assert_noop!(
			Auctions::bid(
				Origin::signed(crowdloan_account),
				ParaId::from(2000),
				2,
				lease_period_index_start + 1,
				lease_period_index_start + 2,
				100,
			), AuctionsError::<Test>::AlreadyLeasedOut,
		);

		assert_noop!(
			Auctions::bid(
				Origin::signed(crowdloan_account),
				ParaId::from(2000),
				2,
				lease_period_index_start - 1,
				lease_period_index_start + 0,
				100,
			), AuctionsError::<Test>::AlreadyLeasedOut,
		);

		assert_noop!(
			Auctions::bid(
				Origin::signed(crowdloan_account),
				ParaId::from(2000),
				2,
				lease_period_index_start + 0,
				lease_period_index_start + 0,
				100,
			), AuctionsError::<Test>::AlreadyLeasedOut,
		);

		assert_noop!(
			Auctions::bid(
				Origin::signed(crowdloan_account),
				ParaId::from(2000),
				2,
				lease_period_index_start + 1,
				lease_period_index_start + 1,
				100,
			), AuctionsError::<Test>::AlreadyLeasedOut,
		);

		assert_noop!(
			Auctions::bid(
				Origin::signed(crowdloan_account),
				ParaId::from(2000),
				2,
				lease_period_index_start - 1,
				lease_period_index_start + 5,
				100,
			), AuctionsError::<Test>::AlreadyLeasedOut,
		);

		// Will work when not overlapping
		assert_ok!(
			Auctions::bid(
				Origin::signed(crowdloan_account),
				ParaId::from(2000),
				2,
				lease_period_index_start + 2,
				lease_period_index_start + 3,
				100,
			)
		);
	});
}