Draft: Resolve "[Document Sealing] Implement PDF parser"

Closes #1

__tests__/index.test.ts

@@ -2,9 +2,10 @@ import fs from "fs";
 import path from "path";
 import { describe, it, expect } from "@jest/globals";
 import PDFparser from "../src/pdfParser";
+import { AppError } from "../src/lib/errors";
 
 describe("PDF parser", () => {
-  it("should return pdf document metadata", async () => {
+  it("should return pdf document metadata including signatures", async () => {
     const file = fs.readFileSync(
       path.resolve(__dirname, "./abacus-two-signatures.pdf")
     );
@@ -12,8 +13,26 @@ describe("PDF parser", () => {
     const parser = new PDFparser(file);
 
     const actual = await parser.getPDFMeta();
-    console.log(actual);
-
     expect(actual.pages).toEqual(2);
   });
+
+  it("should return pdf document metadata without signatures", async () => {
+    const file = fs.readFileSync(path.resolve(__dirname, "./example.pdf"));
+
+    const parser = new PDFparser(file);
+
+    const actual = await parser.getPDFMeta();
+    expect(actual.pages).toEqual(1);
+    expect(actual.title).toEqual("PDF Digital Signatures");
+    expect(actual.author).toEqual("Tecxoft");
+  });
+
+  it("should throw error without file", async () => {
+    try {
+      const parser = new PDFparser(null);
+      const actual = await parser.getPDFMeta();
+    } catch (error) {
+      expect(error).toBeInstanceOf(AppError);
+    }
+  });
 });