From 0357f263ccab36c29f74b6d82c7ab12336bb1fad Mon Sep 17 00:00:00 2001
From: Kharec <sandro@cazzaniga.fr>
Date: Sat, 6 Dec 2025 23:13:21 +0100
Subject: [PATCH] test: add unit test for part one

---
 internal/2021/DayFour/code_test.go | 31 ++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 internal/2021/DayFour/code_test.go

diff --git a/internal/2021/DayFour/code_test.go b/internal/2021/DayFour/code_test.go
new file mode 100644
index 0000000..bedace9
--- /dev/null
+++ b/internal/2021/DayFour/code_test.go
@@ -0,0 +1,31 @@
+package dayfour
+
+import "testing"
+
+var testInput = `7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7`
+
+func TestPartOne(t *testing.T) {
+	expected := 4512
+	got := PartOne(testInput)
+	if got != expected {
+		t.Errorf("PartOne() = %d, want %d", got, expected)
+	}
+}