fix: add update env regression test (#713) (thanks @danielz1z)

src/process/exec.test.ts

@@ -19,4 +19,31 @@ describe("runCommandWithTimeout", () => {
     expect(result.code).toBe(0);
     expect(result.stdout).toBe("ok");
   });
+
+  it("merges custom env with process.env", async () => {
+    const previous = process.env.CLAWDBOT_BASE_ENV;
+    process.env.CLAWDBOT_BASE_ENV = "base";
+    try {
+      const result = await runCommandWithTimeout(
+        [
+          process.execPath,
+          "-e",
+          'process.stdout.write((process.env.CLAWDBOT_BASE_ENV ?? "") + "|" + (process.env.CLAWDBOT_TEST_ENV ?? ""))',
+        ],
+        {
+          timeoutMs: 5_000,
+          env: { CLAWDBOT_TEST_ENV: "ok" },
+        },
+      );
+
+      expect(result.code).toBe(0);
+      expect(result.stdout).toBe("base|ok");
+    } finally {
+      if (previous === undefined) {
+        delete process.env.CLAWDBOT_BASE_ENV;
+      } else {
+        process.env.CLAWDBOT_BASE_ENV = previous;
+      }
+    }
+  });
 });