diff --git a/tests/test_driver.py b/tests/test_driver.py
index 97ae6dfb360e..5deedc61bdfe 100755
--- a/tests/test_driver.py
+++ b/tests/test_driver.py
@@ -8,8 +8,10 @@
 import tempfile
 
 import littlecheck
+
 try:
     import pexpect
+
     PEXPECT = True
 except ImportError:
     PEXPECT = False
@@ -21,7 +23,7 @@
 
 
 def main():
-    if len(sys.argv) <= 2:
+    if len(sys.argv) < 2:
         print("Usage: test_driver.py FISH_DIRECTORY TESTS")
         return 1
 
@@ -45,7 +47,17 @@ def main():
             print(f"Binary does not exist: {bin}")
             return 127
 
-    files = [(os.path.abspath(path), path) for path in sys.argv[2:]]
+    if len(sys.argv) > 2:
+        files = [(os.path.abspath(path), path) for path in sys.argv[2:]]
+    else:
+        files = [
+            (os.path.abspath(path), path.relative_to(script_path))
+            for path in script_path.glob("checks/*.fish")
+        ]
+        files += [
+            (os.path.abspath(path), path.relative_to(script_path))
+            for path in script_path.glob("pexpects/*.py")
+        ]
 
     # Set up tempdir
     # "delete=" was added in 3.12.
@@ -73,9 +85,11 @@ def main():
     # If we're run multiple times, keep this around to save time.
     # TODO: It's cheesy to leave this in the current dir
     if not os.path.exists("fish_test_helper"):
-        comp = subprocess.run(["cc", script_path / "fish_test_helper.c", "-o", "fish_test_helper"])
+        comp = subprocess.run(
+            ["cc", script_path / "fish_test_helper.c", "-o", "fish_test_helper"]
+        )
     shutil.copy("fish_test_helper", home.name + "/fish_test_helper")
-    def_subs.update({"fish_test_helper" : home.name + "/fish_test_helper"})
+    def_subs.update({"fish_test_helper": home.name + "/fish_test_helper"})
 
     # unset LANG, TERM, ...
     for var in [