diff --git a/readme.md b/readme.md
index 8f1b8b1..6844151 100644
--- a/readme.md
+++ b/readme.md
@@ -33,21 +33,27 @@ The name comes from the [D&D 5e spell](https://roll20.net/compendium/dnd5e/Knock
 
 There are no userspace runtime dependencies.
 
-## Building & Contributing
+## Contributing
 
-Install [Nix](https://github.com/NixOS/nix) if you don't have it. [Enable flakes](https://nixos.wiki/wiki/Flakes) if you haven't. Run
+Install [Nix](https://github.com/NixOS/nix) if you don't have it. Enable [flakes](https://nixos.wiki/wiki/Flakes) if you haven't.
+
+### Building
 
 ```
 nix build
 ```
 
-to build and
+### Updating
 
 ```
 nix flake update
 ```
 
-to update libraries.
+### Testing
+
+```
+./tests/test.py
+```
 
 Test books can be found [here](https://www.adobe.com/solutions/ebook/digital-editions/sample-ebook-library.html).
 
diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 0000000..f198160
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1 @@
+workspace
\ No newline at end of file
diff --git a/tests/test.py b/tests/test.py
new file mode 100755
index 0000000..a45ab62
--- /dev/null
+++ b/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")