From 68aaff3bcbebfa1753c35e47f24db3f769d51515 Mon Sep 17 00:00:00 2001
From: Akshaj Singhal <akshaj1504@gmail.com>
Date: Thu, 19 Mar 2026 15:52:41 +0530
Subject: [PATCH] Add CLI argument validation tests for shirt (fixes #153)

---
 shirt/.cs50.yml | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/shirt/.cs50.yml b/shirt/.cs50.yml
index 365a73be..97dd21ac 100644
--- a/shirt/.cs50.yml
+++ b/shirt/.cs50.yml
@@ -3,6 +3,27 @@ submit50:
     - !exclude "*"
     - !require shirt.py
   style: false
-  
+
 check50:
   files: *submit50_files
+
+  checks:
+    - name: "rejects missing output argument"
+      run: python shirt.py input.png
+      exit: 1
+
+    - name: "rejects extra arguments"
+      run: python shirt.py a.png b.png c.png
+      exit: 1
+
+    - name: "rejects non-image input"
+      run: python shirt.py input.txt output.png
+      exit: 1
+
+    - name: "rejects non-image output"
+      run: python shirt.py input.png output.txt
+      exit: 1
+
+    - name: "rejects mismatched extensions"
+      run: python shirt.py input.jpg output.png
+      exit: 1