test(spoke): add PositionStatusFlag action coverage

tests/contracts/spoke/misc/Spoke.PositionStatusFlag.t.sol

@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import 'tests/setup/Base.t.sol';
+
+contract SpokePositionStatusFlagTest is Base {
+  function test_borrow_setsBorrowingFlag() public {
+    uint256 daiReserveId = _daiReserveId(spoke1);
+    uint256 borrowAmount = 100e18;
+
+    SpokeActions.supplyCollateral({
+      spoke: spoke1,
+      reserveId: daiReserveId,
+      caller: bob,
+      amount: borrowAmount * 10,
+      onBehalfOf: bob
+    });
+
+    assertFalse(_isBorrowing(spoke1, daiReserveId, bob), 'borrow flag before borrow');
+
+    vm.prank(bob);
+    spoke1.borrow(daiReserveId, borrowAmount, bob);
+
+    assertTrue(_isBorrowing(spoke1, daiReserveId, bob), 'borrow flag after borrow');
+  }
+
+  function test_repay_clearsBorrowingFlag() public {
+    uint256 daiReserveId = _daiReserveId(spoke1);
+    uint256 borrowAmount = 100e18;
+
+    SpokeActions.supplyCollateral({
+      spoke: spoke1,
+      reserveId: daiReserveId,
+      caller: bob,
+      amount: borrowAmount * 10,
+      onBehalfOf: bob
+    });
+
+    vm.prank(bob);
+    spoke1.borrow(daiReserveId, borrowAmount, bob);
+    assertTrue(_isBorrowing(spoke1, daiReserveId, bob), 'borrow flag after borrow');
+
+    SpokeActions.repay({
+      spoke: spoke1,
+      reserveId: daiReserveId,
+      caller: bob,
+      amount: borrowAmount,
+      onBehalfOf: bob
+    });
+
+    assertFalse(_isBorrowing(spoke1, daiReserveId, bob), 'borrow flag after full repay');
+  }
+
+  function test_setUsingAsCollateral_emitsAndUpdatesFlag() public {
+    uint256 daiReserveId = _daiReserveId(spoke1);
+    uint256 daiAmount = 100e18;
+
+    deal(address(tokenList.dai), bob, daiAmount);
+    SpokeActions.supply({
+      spoke: spoke1,
+      reserveId: daiReserveId,
+      caller: bob,
+      amount: daiAmount,
+      onBehalfOf: bob
+    });
+
+    assertFalse(_isUsingAsCollateral(spoke1, daiReserveId, bob), 'collateral flag before enable');
+
+    vm.prank(bob);
+    vm.expectEmit(address(spoke1));
+    emit ISpoke.SetUsingAsCollateral({
+      reserveId: daiReserveId,
+      caller: bob,
+      user: bob,
+      usingAsCollateral: true
+    });
+    spoke1.setUsingAsCollateral(daiReserveId, true, bob);
+
+    assertTrue(_isUsingAsCollateral(spoke1, daiReserveId, bob), 'collateral flag after enable');
+
+    vm.prank(bob);
+    vm.expectEmit(address(spoke1));
+    emit ISpoke.SetUsingAsCollateral({
+      reserveId: daiReserveId,
+      caller: bob,
+      user: bob,
+      usingAsCollateral: false
+    });
+    spoke1.setUsingAsCollateral(daiReserveId, false, bob);
+
+    assertFalse(_isUsingAsCollateral(spoke1, daiReserveId, bob), 'collateral flag after disable');
+  }
+}