From 175050dcf495c94fc2811f7177ae2d47eeec61a1 Mon Sep 17 00:00:00 2001
From: Karan Chadha <karan10chadha@gmail.com>
Date: Sun, 5 Oct 2025 16:00:50 +0530
Subject: [PATCH] test: Add edge case tests for YearsBeforeDesiredBalance

---
 .../interest-is-interesting/.meta/config.json      |  3 ++-
 .../InterestIsInterestingTests.cs                  | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/exercises/concept/interest-is-interesting/.meta/config.json b/exercises/concept/interest-is-interesting/.meta/config.json
index e686b28f0c..df1e9b46f2 100644
--- a/exercises/concept/interest-is-interesting/.meta/config.json
+++ b/exercises/concept/interest-is-interesting/.meta/config.json
@@ -1,7 +1,8 @@
 {
   "authors": [
     "ErikSchierboom",
-    "yzAlvin"
+    "yzAlvin",
+    "karanchadha10"
   ],
   "files": {
     "solution": [
diff --git a/exercises/concept/interest-is-interesting/InterestIsInterestingTests.cs b/exercises/concept/interest-is-interesting/InterestIsInterestingTests.cs
index 8b1156cad7..1a724f6a2f 100644
--- a/exercises/concept/interest-is-interesting/InterestIsInterestingTests.cs
+++ b/exercises/concept/interest-is-interesting/InterestIsInterestingTests.cs
@@ -197,4 +197,18 @@ public void Years_before_desired_balance_for_large_different_between_start_and_t
     {
         Assert.Equal(85, SavingsAccount.YearsBeforeDesiredBalance(2_345.67m, 12_345.6789m));
     }
+
+    [Fact]
+    [Task(4)]
+    public void Years_before_desired_balance_when_target_already_met()
+    {
+        Assert.Equal(0, SavingsAccount.YearsBeforeDesiredBalance(1_000.0m, 1_000.0m));
+    }
+
+    [Fact]
+    [Task(4)]
+    public void Years_before_desired_balance_when_target_already_exceeded()
+    {
+        Assert.Equal(0, SavingsAccount.YearsBeforeDesiredBalance(1_200.0m, 1_000.0m));
+    }
 }