From 28784f9fd71b69188c77b4280a7ec0db543c55d9 Mon Sep 17 00:00:00 2001
From: Benjamin Bollen <benjamin.bollen@gnosis.io>
Date: Fri, 11 Oct 2024 13:29:13 +0100
Subject: [PATCH] (test/demurrage): quick test on stable point of issuance

---
 test/circles/Demurrage.t.sol   | 25 +++++++++++++++++++++++++
 test/circles/MockDemurrage.sol |  4 ++++
 2 files changed, 29 insertions(+)

diff --git a/test/circles/Demurrage.t.sol b/test/circles/Demurrage.t.sol
index 0586f75..5436b46 100644
--- a/test/circles/Demurrage.t.sol
+++ b/test/circles/Demurrage.t.sol
@@ -55,4 +55,29 @@ contract DemurrageTest is Test, TimeCirclesSetup, Approximation {
             );
         }
     }
+
+    // Test on stable point of issuance
+
+    function testStablePointIssuance() public view {
+        // Stable point of issuance 120804.56 Circles
+        uint192 stable = uint192(120804563587458981173795 + 2343);
+        console.log("stable: ", stable);
+
+        // overshoot stable amount 120804563587458981178828 attoCRC
+        // undershoot stable amount 120804563587458981173795 attoCRC
+        // difference 0.000000000000005033 CRC
+
+        uint192 dailyIssuance = uint192(24 * CRC);
+
+        uint192 balance = stable;
+
+        for (uint256 i = 0; i < 20; i++) {
+            uint192 demurragedBalance = uint192(demurrage.calculateDiscountedBalance(balance, 1));
+            uint192 newBalance = demurragedBalance + dailyIssuance;
+            console.log("balance: ", newBalance);
+            balance = newBalance;
+        }
+
+        console.log("stable: ", stable);
+    }
 }
diff --git a/test/circles/MockDemurrage.sol b/test/circles/MockDemurrage.sol
index 04faeb2..04fa4af 100644
--- a/test/circles/MockDemurrage.sol
+++ b/test/circles/MockDemurrage.sol
@@ -21,4 +21,8 @@ contract MockDemurrage is Demurrage {
     function rLength() external pure returns (uint256) {
         return R_TABLE_LOOKUP;
     }
+
+    function calculateDiscountedBalance(uint256 _balance, uint256 _daysDifference) external view returns (uint256) {
+        return _calculateDiscountedBalance(_balance, _daysDifference);
+    }
 }