diff --git a/src/agents/models-config.providers.minimax.test.ts b/src/agents/models-config.providers.minimax.test.ts
index 7832e483bc..94b7994a6c 100644
--- a/src/agents/models-config.providers.minimax.test.ts
+++ b/src/agents/models-config.providers.minimax.test.ts
@@ -2,12 +2,13 @@ import { mkdtempSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { describe, expect, it } from "vitest";
+import { captureEnv } from "../test-utils/env.js";
 import { resolveImplicitProviders } from "./models-config.providers.js";
 
 describe("MiniMax implicit provider (#15275)", () => {
   it("should use anthropic-messages API for API-key provider", async () => {
     const agentDir = mkdtempSync(join(tmpdir(), "openclaw-test-"));
-    const previous = process.env.MINIMAX_API_KEY;
+    const envSnapshot = captureEnv(["MINIMAX_API_KEY"]);
     process.env.MINIMAX_API_KEY = "test-key";
 
     try {
@@ -16,11 +17,7 @@ describe("MiniMax implicit provider (#15275)", () => {
       expect(providers?.minimax?.api).toBe("anthropic-messages");
       expect(providers?.minimax?.baseUrl).toBe("https://api.minimax.io/anthropic");
     } finally {
-      if (previous === undefined) {
-        delete process.env.MINIMAX_API_KEY;
-      } else {
-        process.env.MINIMAX_API_KEY = previous;
-      }
+      envSnapshot.restore();
     }
   });
 });
diff --git a/src/agents/models-config.providers.nvidia.test.ts b/src/agents/models-config.providers.nvidia.test.ts
index 42a46ebe4a..a9920a3cba 100644
--- a/src/agents/models-config.providers.nvidia.test.ts
+++ b/src/agents/models-config.providers.nvidia.test.ts
@@ -2,13 +2,14 @@ import { mkdtempSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { describe, expect, it } from "vitest";
+import { captureEnv } from "../test-utils/env.js";
 import { resolveApiKeyForProvider } from "./model-auth.js";
 import { buildNvidiaProvider, resolveImplicitProviders } from "./models-config.providers.js";
 
 describe("NVIDIA provider", () => {
   it("should include nvidia when NVIDIA_API_KEY is configured", async () => {
     const agentDir = mkdtempSync(join(tmpdir(), "openclaw-test-"));
-    const previous = process.env.NVIDIA_API_KEY;
+    const envSnapshot = captureEnv(["NVIDIA_API_KEY"]);
     process.env.NVIDIA_API_KEY = "test-key";
 
     try {
@@ -16,17 +17,13 @@ describe("NVIDIA provider", () => {
       expect(providers?.nvidia).toBeDefined();
       expect(providers?.nvidia?.models?.length).toBeGreaterThan(0);
     } finally {
-      if (previous === undefined) {
-        delete process.env.NVIDIA_API_KEY;
-      } else {
-        process.env.NVIDIA_API_KEY = previous;
-      }
+      envSnapshot.restore();
     }
   });
 
   it("resolves the nvidia api key value from env", async () => {
     const agentDir = mkdtempSync(join(tmpdir(), "openclaw-test-"));
-    const previous = process.env.NVIDIA_API_KEY;
+    const envSnapshot = captureEnv(["NVIDIA_API_KEY"]);
     process.env.NVIDIA_API_KEY = "nvidia-test-api-key";
 
     try {
@@ -39,11 +36,7 @@ describe("NVIDIA provider", () => {
       expect(auth.mode).toBe("api-key");
       expect(auth.source).toContain("NVIDIA_API_KEY");
     } finally {
-      if (previous === undefined) {
-        delete process.env.NVIDIA_API_KEY;
-      } else {
-        process.env.NVIDIA_API_KEY = previous;
-      }
+      envSnapshot.restore();
     }
   });