added tests

tests/.gitignore

@@ -0,0 +1 @@
+workspace

tests/test.py

@@ -0,0 +1,46 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i python3 -p python3 python310Packages.beautifulsoup4 python310Packages.requests
+
+from bs4 import BeautifulSoup
+from urllib.parse import urlparse
+from pathlib import Path
+import requests, sys, subprocess, shutil, os
+
+knock_path = Path(__file__).parent.parent.joinpath("result/bin/knock")
+workspace = Path(__file__).parent.joinpath("workspace")
+
+if workspace.exists():
+    shutil.rmtree(workspace)
+workspace.mkdir()
+
+html = requests \
+    .get("https://www.adobe.com/solutions/ebook/digital-editions/sample-ebook-library.html") \
+    .text
+soup = BeautifulSoup(html, 'html.parser')
+
+links = []
+for a_tag in soup.find_all('a'):
+    if a_tag.string != "Download eBook":
+        continue
+    if not urlparse(a_tag.get("href")).path.endswith(".acsm"):
+        continue
+    
+    links.append(a_tag.get("href"))
+
+for i, link in enumerate(links):
+    i = str(i)
+    print("Testing URL #" + i + ":\n" + link)
+    file = workspace.joinpath(i + ".acsm")
+
+    r = requests.get(link)
+    open(file, "wb").write(r.content)
+
+    result = subprocess.run([knock_path, file])
+
+    if result.returncode != 0:
+        print("Failed")
+        sys.exit()
+
+    print("Success\n---")
+
+print("All tests passed")