From fd5af311141bf533407eb3a019f8d6a5b3deb4a2 Mon Sep 17 00:00:00 2001
From: Emil Lerch <emil@lerch.org>
Date: Mon, 29 Jun 2026 21:26:15 -0700
Subject: [PATCH] add test for arena dupe

---
 src/PortfolioData.zig | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/PortfolioData.zig b/src/PortfolioData.zig
index da5b1e2..c4ea16f 100644
--- a/src/PortfolioData.zig
+++ b/src/PortfolioData.zig
@@ -1622,3 +1622,23 @@ test "PortfolioData.revalue: returns false when the recompute yields no allocati
     defer overlay.deinit();
     try testing.expect(!pd.revalue(Date.fromYmd(2026, 5, 8), &overlay));
 }
+
+test "dupePricesArena: copies entries with arena-owned keys" {
+    var arena = std.heap.ArenaAllocator.init(testing.allocator);
+    defer arena.deinit();
+    const a = arena.allocator();
+
+    var src = std.StringHashMap(f64).init(testing.allocator);
+    defer src.deinit();
+    try src.put("AAPL", 1.5);
+    try src.put("SPY", 2.5);
+
+    // Copy lives in the arena (keys duped there), so it survives `src`
+    // being freed; reaped wholesale by arena.deinit (no out.deinit).
+    var out = dupePricesArena(a, &src);
+    src.clearAndFree(); // drop the source + its keys
+
+    try testing.expectEqual(@as(usize, 2), out.count());
+    try testing.expectApproxEqAbs(@as(f64, 1.5), out.get("AAPL").?, 0.0001);
+    try testing.expectApproxEqAbs(@as(f64, 2.5), out.get("SPY").?, 0.0001);
+}