From 604ef04d6d1fce2efac5245d37be3208f6723fec Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Fri, 10 Apr 2026 05:12:04 +0000
Subject: [PATCH] =?UTF-8?q?=F0=9F=A7=AA=20[Testing=20Improvement]=20Add=20?=
 =?UTF-8?q?ArrayList=20clear=20and=20pop=20test?=
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Addresses an untested gap in `ArrayList.pop` functionality where popping from a logically empty list (after calling `clear`) was not explicitly verified to return `null`.

🎯 **What:** Appends a test to `echo-core-zig/src/data/arraylist.zig` to verify popping from an emptied list.
📊 **Coverage:** The new `test "ArrayList clear and pop"` scenario verifies that `ArrayList.clear()` adequately sets length to 0, which successfully enables `ArrayList.pop()` to return `null`.
✨ **Result:** Test coverage for `ArrayList` improved.

Co-authored-by: ulac000000 <132948319+ulac000000@users.noreply.github.com>
---
 echo-core-zig/src/data/arraylist.zig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/echo-core-zig/src/data/arraylist.zig b/echo-core-zig/src/data/arraylist.zig
index 80a3f42..58fe487 100644
--- a/echo-core-zig/src/data/arraylist.zig
+++ b/echo-core-zig/src/data/arraylist.zig
@@ -109,3 +109,13 @@ test "ArrayList get out of bounds" {
     try std.testing.expectEqual(@as(?*const i32, null), list.get(1));
     try std.testing.expectEqual(@as(?*const i32, null), list.get(100));
 }
+
+test "ArrayList clear and pop" {
+    var list = ArrayList(i32).init(std.testing.allocator);
+    defer list.deinit();
+
+    try list.append(1);
+    list.clear();
+
+    try std.testing.expectEqual(@as(?i32, null), list.pop());
+}