diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 79e303b..c8d5e68 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -20,6 +20,6 @@ jobs:
       run: timeout 300 cargo test --verbose
     - name: Run background corolla server
       run: |
-       cargo run -- -s examples/example_spec.json -d tmp/$(date +%s).sqlite3 -r /test &
+       timeout 300 cargo run -- -s examples/example_spec.json -d tmp/$(date +%s).sqlite3 -r /test &
        sleep 5
        bun test
diff --git a/examples/example_spec.json b/examples/example_spec.json
index ce56b32..2ec1533 100644
--- a/examples/example_spec.json
+++ b/examples/example_spec.json
@@ -13,7 +13,7 @@
     "write": {
       "write01": {
         "sql_template": "insert into t values (?);",
-        "args": ["a"]
+        "args": ["c"]
       }
     }
   },
diff --git a/js_api/api_test.ts b/js_api/api_test.ts
index abed75a..a63b6c1 100644
--- a/js_api/api_test.ts
+++ b/js_api/api_test.ts
@@ -1,5 +1,5 @@
 import { Corolla } from "../js_api/index";
-import { afterAll, beforeAll, expect, test } from "bun:test";
+import { expect, test } from "bun:test";
 
 const corolla = new Corolla("http://127.0.0.1:50000", "/test");
 
@@ -14,17 +14,19 @@ const read01 = corolla.make_read_query<
 
 test("write query", async () => {
   let res = await write01({ c: "carrot" });
-  expect(res.status).toBe(200);
+  expect(res.ok).toBeTrue;
   res = await write01({ c: "tomato" });
-  expect(res.status).toBe(200);
+  expect(res.ok).toBeTrue;
   res = await write01({ c: "squash" });
-  expect(res.status).toBe(200);
+  expect(res.ok).toBeTrue;
 });
 
 test("read query", async () => {
   const rows = await read01({});
-  expect(
-    JSON.stringify(rows) ===
-      JSON.stringify([{ c: "carrot" }, { c: "tomato" }, { c: "squash" }]),
-  );
+  expect(rows !== null);
+  if (rows !== null) {
+    expect(rows[0].c).toBe("carrot");
+    expect(rows[1].c).toBe("tomato");
+    expect(rows[2].c).toBe("squash");
+  }
 });
diff --git a/js_api/index.ts b/js_api/index.ts
index dbe5472..16755d1 100644
--- a/js_api/index.ts
+++ b/js_api/index.ts
@@ -26,16 +26,17 @@ class Corolla {
   ) {
     return async (
       args: Args,
-    ): Promise<Result[]> => {
+    ): Promise<Result[] | null> => {
       const url_query_args = args === undefined
         ? ""
         : "?" + new URLSearchParams(args);
-      const res: string[][] = await fetch(
+      const http_res = await fetch(
         `${this.server}${this.url_base}/read/${query}${url_query_args}`,
-      )
-        .then((
-          r,
-        ) => r.json());
+      );
+      if (!http_res.ok) {
+        return null;
+      }
+      const res: string[][] = await http_res.json();
       if (res.length === 0) {
         return [];
       }
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index d28ef01..c05485a 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -24,19 +24,18 @@ pub fn get_root_dir() -> PathBuf {
 pub async fn cleanup(delete_db: bool, proc: Option<&mut Child>) {
     if delete_db {
         let path = get_root_dir();
-        for file in [
-            "corolla-test.sqlite3",
-            "corolla-test.sqlite3-shm",
-            "corolla-test.sqlite3-wal",
-        ]
-        .iter()
-        {
-            Command::new("rm")
-                .arg(Path::new(&path).join("tmp").join(file).to_str().unwrap())
-                .output()
-                .await
-                .expect("could not execute cleanup step");
-        }
+        Command::new("rm")
+            .arg("-rf")
+            .arg(Path::new(&path).join("tmp").to_str().unwrap())
+            .output()
+            .await
+            .expect("could not execute rm");
+        Command::new("mkdir")
+            .arg("-p")
+            .arg(Path::new(&path).join("tmp").to_str().unwrap())
+            .output()
+            .await
+            .expect("could not execute mkdir");
     }
     match proc {
         Some(proc) => {