add more tests in the node environment

tests/node.test.ts

@@ -1,4 +1,5 @@
 // @vitest-environment node
+import { createReadStream, promises as fs } from "node:fs";
 import { describe, expect, it } from "vitest";
 import { pdf } from "../src";
 
@@ -9,3 +10,34 @@ describe("example.pdf in node", () => {
     }
   });
 });
+
+describe("data url", () => {
+  it("can load a document from a data URL", async () => {
+    const b64 = await fs.readFile("./tests/example.pdf", "base64");
+    const dataUrl = `data:application/pdf;base64,${b64}`;
+
+    for await (const page of await pdf(dataUrl)) {
+      expect(page).toMatchImageSnapshot();
+    }
+  });
+});
+
+describe("Buffer", () => {
+  it("can load a document from a buffer", async () => {
+    const buf = await fs.readFile("./tests/example.pdf");
+
+    for await (const page of await pdf(buf)) {
+      expect(page).toMatchImageSnapshot();
+    }
+  });
+});
+
+describe("ReadableStream", () => {
+  it("can load a document from a ReadableStream", async () => {
+    const readableStream = createReadStream("./tests/example.pdf");
+
+    for await (const page of await pdf(readableStream)) {
+      expect(page).toMatchImageSnapshot();
+    }
+  });
+});