From 634baee683fab3025d08989d4e4ec657ca3a28c3 Mon Sep 17 00:00:00 2001
From: teddy <teddy@defi.sucks>
Date: Wed, 24 Jul 2024 10:35:53 -0300
Subject: [PATCH] test: missing case for joinswapPoolAmountOut

---
 test/unit/BPool/BPool_JoinswapPoolAmountOut.t.sol | 7 +++++++
 test/unit/BPool/BPool_JoinswapPoolAmountOut.tree  | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/test/unit/BPool/BPool_JoinswapPoolAmountOut.t.sol b/test/unit/BPool/BPool_JoinswapPoolAmountOut.t.sol
index 98c22e0d..78ef1fbb 100644
--- a/test/unit/BPool/BPool_JoinswapPoolAmountOut.t.sol
+++ b/test/unit/BPool/BPool_JoinswapPoolAmountOut.t.sol
@@ -52,6 +52,13 @@ contract BPoolJoinswapPoolAmountOut is BPoolBase, BNum {
     bPool.joinswapPoolAmountOut(makeAddr('unknown token'), poolAmountOut, maxTokenIn);
   }
 
+  function test_RevertWhen_TokenAmountInIsZero() external {
+    // it should revert
+    vm.expectRevert(IBPool.BPool_InvalidTokenAmountIn.selector);
+    // using a small amount that rounds to zero
+    bPool.joinswapPoolAmountOut(tokenIn, 20, type(uint256).max);
+  }
+
   function test_RevertWhen_TokenAmountInExceedsMaxRatio() external {
     // it should revert
     vm.expectRevert(IBPool.BPool_TokenAmountInAboveMaxRatio.selector);
diff --git a/test/unit/BPool/BPool_JoinswapPoolAmountOut.tree b/test/unit/BPool/BPool_JoinswapPoolAmountOut.tree
index ec19a013..b795f4b7 100644
--- a/test/unit/BPool/BPool_JoinswapPoolAmountOut.tree
+++ b/test/unit/BPool/BPool_JoinswapPoolAmountOut.tree
@@ -5,6 +5,8 @@ BPool::JoinswapPoolAmountOut
 │   └── it should revert
 ├── when token in is not bound
 │   └── it should revert
+├── when token amount in is zero
+│   └── it should revert 
 ├── when token amount in exceeds max ratio
 │   └── it should revert 
 ├── when calculated token amount in is more than expected