Abort requests [#608] (#625)

* Properly abort requests using AbortController

* add basic adapter tests

---------

Co-authored-by: Andrew Dassonville <dassonville.andrew@gmail.com>

js/test/utils.ts

@@ -0,0 +1,44 @@
+import fs from "fs";
+import { http, HttpResponse } from "msw";
+import { setupServer } from "msw/node";
+
+class MockServer {
+  etag?: string;
+  numRequests: number;
+  lastCache?: string;
+
+  reset() {
+    this.numRequests = 0;
+    this.etag = undefined;
+  }
+
+  constructor() {
+    this.numRequests = 0;
+    this.etag = undefined;
+    const serverBuffer = fs.readFileSync("test/data/test_fixture_1.pmtiles");
+    const server = setupServer(
+      http.get(
+        "http://localhost:1337/example.pmtiles",
+        ({ request, params }) => {
+          this.lastCache = request.cache;
+          this.numRequests++;
+          const range = request.headers.get("range")?.substr(6).split("-");
+          if (!range) {
+            throw new Error("invalid range");
+          }
+          const offset = +range[0];
+          const length = +range[1];
+          const body = serverBuffer.slice(offset, offset + length - 1);
+          return new HttpResponse(body, {
+            status: 206,
+            statusText: "OK",
+            headers: { etag: this.etag } as HeadersInit,
+          });
+        }
+      )
+    );
+    server.listen({ onUnhandledRequest: "error" });
+  }
+}
+
+export const mockServer = new MockServer();