From 90343d1868df01899b5cceea96f680e7bca38767 Mon Sep 17 00:00:00 2001
From: Jakub Konka <kubkon@jakubkonka.com>
Date: Mon, 17 Jan 2022 12:26:48 +0100
Subject: [PATCH] libstd: add smoke test for insert methods in MultiArrayList

---
 lib/std/multi_array_list.zig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/std/multi_array_list.zig b/lib/std/multi_array_list.zig
index 7195aef55a..47d12884df 100644
--- a/lib/std/multi_array_list.zig
+++ b/lib/std/multi_array_list.zig
@@ -602,3 +602,22 @@ test "ensure capacity on empty list" {
     try testing.expectEqualSlices(u32, &[_]u32{ 9, 11 }, list.items(.a));
     try testing.expectEqualSlices(u8, &[_]u8{ 10, 12 }, list.items(.b));
 }
+
+test "insert elements" {
+    const ally = testing.allocator;
+
+    const Foo = struct {
+        a: u8,
+        b: u32,
+    };
+
+    var list = MultiArrayList(Foo){};
+    defer list.deinit(ally);
+
+    try list.insert(ally, 0, .{ .a = 1, .b = 2 });
+    try list.ensureUnusedCapacity(ally, 1);
+    list.insertAssumeCapacity(1, .{ .a = 2, .b = 3 });
+
+    try testing.expectEqualSlices(u8, &[_]u8{ 1, 2 }, list.items(.a));
+    try testing.expectEqualSlices(u32, &[_]u32{ 2, 3 }, list.items(.b));
+}