Fix tests for single

src/Query.ts

@@ -384,6 +384,24 @@ export class SodaQuery<T> {
     }));
   }
 
+  single(
+    queryID?: string,
+    signal?: AbortSignal,
+  ): DataResponse<T & ExtraDataFields> {
+    const currentLimit = this.#limit;
+    this.#limit = 1;
+    return this.execute(queryID, signal).then((res) => {
+      this.#limit = currentLimit;
+      return {
+        ...res,
+        data: res.data?.[0] ?? null,
+      };
+    }).catch((err) => {
+      this.#limit = currentLimit;
+      return Promise.reject(err);
+    });
+  }
+
   executeGeoJSON(
     queryID?: string,
     signal?: AbortSignal,

test/Query.test.ts

@@ -114,22 +114,41 @@ Deno.test("SodaQuery QueryObj", () => {
 Deno.test("SodaQuery (request)", async () => {
   const query = createSampleQuery<{ test: number }>();
 
+  const res = new Response(JSON.stringify([{ test: 1 }]), {
+    status: 200,
+    headers: {
+      "Last-Modified": "Mon, 01 Jan 2001 00:00:00 GMT",
+      "ETag": "test",
+    },
+  });
+
   await mockFetch(
     createRequest(),
-    new Response(JSON.stringify([{ test: 1 }]), {
-      status: 200,
-      headers: {
-        "Last-Modified": "Mon, 01 Jan 2001 00:00:00 GMT",
-        "ETag": "test",
-      },
-    }),
+    res,
+  );
+  await mockFetch(
+    createRequest("https://test.example.com/resource/test.json?$limit=1"),
+    res,
   );
 
   const d = await query.execute();
+  const single = await query.single();
   assertEquals(d.data[0]?.test, 1);
+  assertEquals(single.data.test, 1);
   assertEquals(query.headers.lastModified, "Mon, 01 Jan 2001 00:00:00 GMT");
   assertEquals(query.headers.etag, "test");
 
+  const emptyQuery = createSampleQuery<{ test: number }>();
+  await mockFetch(
+    createRequest("https://test.example.com/resource/test.json?$limit=1"),
+    new Response(JSON.stringify([]), {
+      status: 200,
+    }),
+  );
+
+  const emptySingle = await emptyQuery.single();
+  assertEquals(emptySingle.data, null);
+
   // With Access Token
   const query2 = createSampleQuery<{ test: number }>({
     accessToken: "test",