libstd: add smoke test for insert methods in MultiArrayList

1 files changed, 19 insertions, 0 deletions

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));
+}