diff --git a/packages/core-testing/src/instrumentation/index.ts b/packages/core-testing/src/instrumentation/index.ts
index c9e8673..8d29f2f 100644
--- a/packages/core-testing/src/instrumentation/index.ts
+++ b/packages/core-testing/src/instrumentation/index.ts
@@ -4,3 +4,4 @@ export { RecordingMetrics, type RecordedMetric } from "./recording-metrics";
 export { RecordingJobQueue } from "./recording-job-queue";
 export { RecordingEventBus } from "./recording-event-bus";
 export { RecordingRealtimeBroadcaster } from "./recording-realtime-broadcaster";
+export { RecordingAuditLog } from "./recording-audit-log";
diff --git a/packages/core-testing/src/instrumentation/recording-audit-log.test.ts b/packages/core-testing/src/instrumentation/recording-audit-log.test.ts
new file mode 100644
index 0000000..27a90d6
--- /dev/null
+++ b/packages/core-testing/src/instrumentation/recording-audit-log.test.ts
@@ -0,0 +1,51 @@
+import { describe, it, expect } from "vitest";
+import { RecordingAuditLog } from "./recording-audit-log";
+import type { AuditEntry } from "@repo/core-shared/audit";
+
+const sample: AuditEntry = {
+  actorId: "user_1",
+  actorType: "user",
+  actorRoles: [],
+  action: "CREATE",
+  resource: { type: "articles" },
+  at: new Date(),
+  scope: { feature: "blog", environment: "test", tenant: "default" },
+  from: { ipTruncated: "10.0.0.0", userAgent: "test" },
+  containsPii: false,
+  outcome: "success",
+};
+
+describe("RecordingAuditLog", () => {
+  it("record() pushes to recorded[]", async () => {
+    const log = new RecordingAuditLog();
+    await log.record(sample);
+    expect(log.recorded).toHaveLength(1);
+    expect(log.recorded[0]!.actorId).toBe("user_1");
+  });
+
+  it("eraseSubject(pseudonymize) tracks erasure + rewrites actorId in recorded", async () => {
+    const log = new RecordingAuditLog();
+    await log.record(sample);
+    await log.eraseSubject("user_1", "pseudonymize");
+    expect(log.erasures).toEqual([{ actorId: "user_1", mode: "pseudonymize" }]);
+    expect(log.recorded[0]!.actorId).toBe("erased-user_1");  // sentinel rewrite
+  });
+
+  it("eraseSubject(delete) removes matching entries from recorded", async () => {
+    const log = new RecordingAuditLog();
+    await log.record(sample);
+    await log.record({ ...sample, actorId: "user_2" });
+    await log.eraseSubject("user_1", "delete");
+    expect(log.recorded.map((r) => r.actorId)).toEqual(["user_2"]);
+    expect(log.erasures).toEqual([{ actorId: "user_1", mode: "delete" }]);
+  });
+
+  it("reset() clears recorded + erasures", async () => {
+    const log = new RecordingAuditLog();
+    await log.record(sample);
+    await log.eraseSubject("user_1", "pseudonymize");
+    log.reset();
+    expect(log.recorded).toEqual([]);
+    expect(log.erasures).toEqual([]);
+  });
+});
diff --git a/packages/core-testing/src/instrumentation/recording-audit-log.ts b/packages/core-testing/src/instrumentation/recording-audit-log.ts
new file mode 100644
index 0000000..735e83a
--- /dev/null
+++ b/packages/core-testing/src/instrumentation/recording-audit-log.ts
@@ -0,0 +1,37 @@
+import type { AuditEntry } from "@repo/core-shared/audit";
+
+/**
+ * Test-side recording double for IAuditLog. Mirrors Payload semantics in
+ * eraseSubject (pseudonymize rewrites in place; delete filters out) so tests
+ * can assert against the same observable state the real impl produces.
+ *
+ * Use directly via constructor injection in factory-function tests — no
+ * container manipulation needed.
+ */
+export class RecordingAuditLog {
+  public recorded: AuditEntry[] = [];
+  public erasures: { actorId: string; mode: "pseudonymize" | "delete" }[] = [];
+
+  async record(entry: AuditEntry): Promise<void> {
+    // Shallow copy to avoid mutating caller's object during eraseSubject
+    this.recorded.push({ ...entry });
+  }
+
+  async eraseSubject(actorId: string, mode: "pseudonymize" | "delete"): Promise<void> {
+    this.erasures.push({ actorId, mode });
+    if (mode === "pseudonymize") {
+      for (const r of this.recorded) {
+        if (r.actorId === actorId) {
+          r.actorId = `erased-${actorId}`;
+        }
+      }
+    } else {
+      this.recorded = this.recorded.filter((r) => r.actorId !== actorId);
+    }
+  }
+
+  reset(): void {
+    this.recorded = [];
+    this.erasures = [];
+  }
+}