diff --git a/src/node-host/invoke.sanitize-env.test.ts b/src/node-host/invoke.sanitize-env.test.ts
index 27f092d0aae..589d6196029 100644
--- a/src/node-host/invoke.sanitize-env.test.ts
+++ b/src/node-host/invoke.sanitize-env.test.ts
@@ -1,5 +1,6 @@
 import { describe, expect, it } from "vitest";
 import { sanitizeEnv } from "./invoke.js";
+import { buildNodeInvokeResultParams } from "./runner.js";
 
 describe("node-host sanitizeEnv", () => {
   it("ignores PATH overrides", () => {
@@ -46,3 +47,34 @@ describe("node-host sanitizeEnv", () => {
     }
   });
 });
+
+describe("buildNodeInvokeResultParams", () => {
+  it("omits optional fields when null/undefined", () => {
+    const params = buildNodeInvokeResultParams(
+      { id: "invoke-1", nodeId: "node-1", command: "system.run" },
+      { ok: true, payloadJSON: null, error: null },
+    );
+
+    expect(params).toEqual({ id: "invoke-1", nodeId: "node-1", ok: true });
+    expect("payloadJSON" in params).toBe(false);
+    expect("error" in params).toBe(false);
+  });
+
+  it("includes payloadJSON when provided", () => {
+    const params = buildNodeInvokeResultParams(
+      { id: "invoke-2", nodeId: "node-2", command: "system.run" },
+      { ok: true, payloadJSON: '{"ok":true}' },
+    );
+
+    expect(params.payloadJSON).toBe('{"ok":true}');
+  });
+
+  it("includes payload when provided", () => {
+    const params = buildNodeInvokeResultParams(
+      { id: "invoke-3", nodeId: "node-3", command: "system.run" },
+      { ok: false, payload: { reason: "bad" } },
+    );
+
+    expect(params.payload).toEqual({ reason: "bad" });
+  });
+});
diff --git a/src/node-host/runner.test.ts b/src/node-host/runner.test.ts
deleted file mode 100644
index 932f811ed44..00000000000
--- a/src/node-host/runner.test.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-import { describe, expect, test } from "vitest";
-import { buildNodeInvokeResultParams } from "./runner.js";
-
-describe("buildNodeInvokeResultParams", () => {
-  test("omits optional fields when null/undefined", () => {
-    const params = buildNodeInvokeResultParams(
-      { id: "invoke-1", nodeId: "node-1", command: "system.run" },
-      { ok: true, payloadJSON: null, error: null },
-    );
-
-    expect(params).toEqual({ id: "invoke-1", nodeId: "node-1", ok: true });
-    expect("payloadJSON" in params).toBe(false);
-    expect("error" in params).toBe(false);
-  });
-
-  test("includes payloadJSON when provided", () => {
-    const params = buildNodeInvokeResultParams(
-      { id: "invoke-2", nodeId: "node-2", command: "system.run" },
-      { ok: true, payloadJSON: '{"ok":true}' },
-    );
-
-    expect(params.payloadJSON).toBe('{"ok":true}');
-  });
-
-  test("includes payload when provided", () => {
-    const params = buildNodeInvokeResultParams(
-      { id: "invoke-3", nodeId: "node-3", command: "system.run" },
-      { ok: false, payload: { reason: "bad" } },
-    );
-
-    expect(params.payload).toEqual({ reason: "bad" });
-  });
-});