add convenience view funcs

src/PublicLockV14Eligibility.sol

@@ -249,10 +249,21 @@ contract PublicLockV14Eligibility is HatsEligibilityModule, ILockKeyPurchaseHook
                           VIEW FUNCTIONS
   //////////////////////////////////////////////////////////////*/
 
-  function keyPurchaseToken() public view returns (address) {
+  /// @notice Convenience function to get the key purchase token address from the lock
+  function keyPurchaseToken() external view returns (address) {
     return lock.tokenAddress();
   }
 
+  /// @notice Convenience function to get the expiration duration from the lock
+  function expirationDuration() external view returns (uint256) {
+    return lock.expirationDuration();
+  }
+
+  /// @notice Convenience function to get the max number of keys from the lock
+  function maxNumberOfKeys() external view returns (uint256) {
+    return lock.maxNumberOfKeys();
+  }
+
   /*//////////////////////////////////////////////////////////////
                         INTERNAL FUNCTIONS
   //////////////////////////////////////////////////////////////*/

test/PublicLockEligibility.t.sol

@@ -495,3 +495,35 @@ contract KeyPurchaseToken is WithInstanceTest {
     assertEq(instance.keyPurchaseToken(), token);
   }
 }
+
+contract ExpirationDuration is WithInstanceTest {
+  function test_happy() public {
+    lock = _getLock();
+
+    assertEq(instance.expirationDuration(), lockConfig.expirationDuration);
+
+    // change the expiration duration
+    uint256 newDuration = lockConfig.expirationDuration + 1;
+    vm.prank(lockManager);
+    lock.updateLockConfig(newDuration, lockConfig.maxNumberOfKeys, 1);
+
+    // the new duration should be returned
+    assertEq(instance.expirationDuration(), newDuration);
+  }
+}
+
+contract MaxNumberOfKeys is WithInstanceTest {
+  function test_happy() public {
+    lock = _getLock();
+
+    assertEq(instance.maxNumberOfKeys(), lockConfig.maxNumberOfKeys);
+
+    // change the max number of keys
+    uint256 newMaxNumberOfKeys = lockConfig.maxNumberOfKeys + 1;
+    vm.prank(lockManager);
+    lock.updateLockConfig(lockConfig.expirationDuration, newMaxNumberOfKeys, 1);
+
+    // the new max number of keys should be returned
+    assertEq(instance.maxNumberOfKeys(), newMaxNumberOfKeys);
+  }
+}