From 69655416908768c4805ad20de8a3fdd8b2ed8291 Mon Sep 17 00:00:00 2001
From: Adam Malczewski <github@tradam.dev>
Date: Sun, 28 Jun 2026 00:11:55 +0900
Subject: feat(step-context-update): update context window usage at end of each
 step

---
 src/core/metrics/format.test.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/core/metrics/format.test.ts')

diff --git a/src/core/metrics/format.test.ts b/src/core/metrics/format.test.ts
index c7c4fbb..97170d0 100644
--- a/src/core/metrics/format.test.ts
+++ b/src/core/metrics/format.test.ts
@@ -351,8 +351,14 @@ describe("computeContextUsage", () => {
     expect(u.percent).toBeCloseTo(3.4102, 4);
   });
 
-  it("treats unknown contextSize as current 0", () => {
+  it("treats unknown contextSize as current null (never 0)", () => {
     const u = computeContextUsage(undefined, 1_000_000);
+    expect(u.current).toBeNull();
+    expect(u.percent).toBeNull();
+  });
+
+  it("an explicit 0 context size is a real reported value (current 0)", () => {
+    const u = computeContextUsage(0, 1_000_000);
     expect(u.current).toBe(0);
     expect(u.percent).toBe(0);
   });
-- 
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