test: add initial testing and linting (#18)

tests/mocks/handlers.ts

@@ -0,0 +1,25 @@
+import { http, HttpResponse } from 'msw';
+
+export const handlers = [
+  http.all('https://httpbin.org/*', async (req) => {
+    const bodyRaw = await req.request.text();
+    let bodyJson: unknown = undefined;
+    try {
+      bodyJson = JSON.parse(bodyRaw);
+      /* eslint-disable-next-line @typescript-eslint/no-unused-vars */
+    } catch (e) {
+      // Ignore error
+    }
+    return HttpResponse.text(
+      JSON.stringify(
+        {
+          headers: Object.fromEntries(req.request.headers.entries()),
+          data: bodyRaw,
+          json: bodyJson,
+        },
+        null,
+        2,
+      ),
+    );
+  }),
+];

tests/mocks/node.ts

@@ -0,0 +1,5 @@
+import { setupServer } from 'msw/node';
+
+import { handlers } from './handlers.js';
+
+export const server = setupServer(...handlers);