VAL-36 Allow setting pool capacity

contracts/Pool.sol

@@ -296,13 +296,13 @@ contract Pool is IPool, ERC20 {
     }
 
     /**
-     * @dev Updates the pool capacity. Can only be called by the Pool Manager.
+     * @inheritdoc IPool
      */
-    function updatePoolCapacity(uint256)
-        external
-        onlyManager
-        returns (uint256)
-    {}
+    function updatePoolCapacity(uint256 newCapacity) external onlyManager {
+        require(newCapacity >= totalAssets(), "Pool: invalid capacity");
+        _poolSettings.maxCapacity = newCapacity;
+        emit PoolSettingsUpdated();
+    }
 
     /**
      * @dev Updates the pool end date. Can only be called by the Pool Manager.

contracts/interfaces/IPool.sol

@@ -86,7 +86,7 @@ interface IPool is IERC4626 {
     /**
      * @dev Emitted when pool settings are updated.
      */
-    event PoolSettingsUpdated(IPoolConfigurableSettings settings);
+    event PoolSettingsUpdated();
 
     /**
      * @dev Emitted when first loss capital is used to cover loan defaults
@@ -155,7 +155,7 @@ interface IPool is IERC4626 {
     /**
      * @dev Updates the pool capacity. Can only be called by the Pool Manager.
      */
-    function updatePoolCapacity(uint256) external returns (uint256);
+    function updatePoolCapacity(uint256) external;
 
     /**
      * @dev Updates the pool end date. Can only be called by the Pool Manager.

test/Pool.test.ts

@@ -452,6 +452,33 @@ describe("Pool", () => {
     });
   });
 
+  describe("updatePoolCapacity()", () => {
+    it("prevents setting capacity to less than current pool size", async () => {
+      const { pool, otherAccount, poolManager, liquidityAsset } =
+        await loadFixture(loadPoolFixture);
+
+      await activatePool(pool, poolManager, liquidityAsset);
+      await depositToPool(pool, otherAccount, liquidityAsset, 100);
+      await expect(
+        pool.connect(poolManager).updatePoolCapacity(1)
+      ).to.be.revertedWith("Pool: invalid capacity");
+    });
+
+    it("allows setting pool capacity", async () => {
+      const { pool, otherAccount, poolManager, liquidityAsset } =
+        await loadFixture(loadPoolFixture);
+
+      await activatePool(pool, poolManager, liquidityAsset);
+      await depositToPool(pool, otherAccount, liquidityAsset, 100);
+      await expect(pool.connect(poolManager).updatePoolCapacity(101)).to.emit(
+        pool,
+        "PoolSettingsUpdated"
+      );
+
+      expect((await pool.settings()).maxCapacity).to.equal(101);
+    });
+  });
+
   describe("Permissions", () => {
     describe("updatePoolCapacity()", () => {
       it("reverts if not called by Pool Manager", async () => {