diff --git a/integration/test_hurl.py b/integration/test_hurl.py
index c4ca7b590..a72cf8fd4 100755
--- a/integration/test_hurl.py
+++ b/integration/test_hurl.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# test hurl file
+# Test Hurl files.
 #
 import codecs
 import sys
@@ -8,9 +8,11 @@ import os
 import platform
 import check_json_output
 import re
+import argparse
 
 
-def decode_string(encoded):
+def decode_string(encoded: bytes) -> str:
+    """Decodes bytes to string from infering encoding."""
     if encoded.startswith(codecs.BOM_UTF8):
         return encoded.decode("utf-8-sig")
     elif encoded.startswith(codecs.BOM_UTF16):
@@ -20,9 +22,10 @@ def decode_string(encoded):
         return encoded.decode()
 
 
-# return linux-fedora, linux, osx or windows
-# can add more specific linux variant if needed
-def get_os():
+def get_os() -> str:
+    """Returns `linux-fedora`, `linux`, `osx` or `windows`
+    can add more specific linux variant if needed
+    """
     if platform.system() == "Linux":
         if os.path.exists("/etc/fedora-release"):
             return "linux-fedora"
@@ -35,8 +38,13 @@ def get_os():
         raise Error("Invalid Platform " + platform.system())
 
 
-def test(hurl_file):
+def test(hurl_file: str) -> int:
+    """Runs a Hurl file and returns the exit code.
 
+    Arguments:
+    hurl_file -- the Hurl file to run
+    use_cargo -- true to run hurl with 'cargo run', else just run 'hurl"
+    """
     options_file = hurl_file.replace(".hurl", ".options")
 
     # For .curl file, we can have specific os expected file in order to test
@@ -71,7 +79,6 @@ def test(hurl_file):
             env[name] = value
 
     cmd = ["hurl", hurl_file] + options
-    # cmd = ["cargo", "run", "--bin", "hurl", "--", hurl_file] + options
     print(" ".join(cmd))
     result = subprocess.run(
         cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env
@@ -86,7 +93,7 @@ def test(hurl_file):
         stderr = decode_string(result.stderr).strip()
         if stderr != "":
             print(stderr)
-        sys.exit(1)
+        return 1
 
     # stdout
     f = hurl_file.replace(".hurl", ".out")
@@ -96,7 +103,7 @@ def test(hurl_file):
         if actual != expected:
             print(">>> error in stdout")
             print(f"actual: <{actual}>\nexpected: <{expected}>")
-            sys.exit(1)
+            return 1
 
     # stdout with textual pattern / line per line
     f = hurl_file.replace(".hurl", ".out.pattern")
@@ -120,7 +127,7 @@ def test(hurl_file):
                 print(
                     f"expected: <{expected_lines[i]}> (translated to regex <{expected_pattern_lines[i]}>)"
                 )
-                sys.exit(1)
+                return 1
 
     # stdout (json)
     if os.path.exists(json_output_file):
@@ -145,7 +152,7 @@ def test(hurl_file):
             if expected != actual:
                 print(">>> error in stderr")
                 print(f"actual: <{actual}>\nexpected: <{expected}>")
-                sys.exit(1)
+                return 1
 
     # stderr with textual pattern / line per line
     f = hurl_file.replace(".hurl", ".err.pattern")
@@ -161,7 +168,7 @@ def test(hurl_file):
                 "actual: %d lines\nexpected: %d lines"
                 % (len(actual_lines), len(expected_lines))
             )
-            sys.exit(1)
+            return 1
         for i in range(len(expected_pattern_lines)):
             if not re.match(expected_pattern_lines[i], actual_lines[i]):
                 print(f">>> error in stderr in line {i+1}")
@@ -169,7 +176,7 @@ def test(hurl_file):
                 print(
                     f"expected: <{expected_lines[i]}> (translated to regex <{expected_pattern_lines[i]}>)"
                 )
-                sys.exit(1)
+                return 1
 
     # curl output
     if os.path.exists(curl_file):
@@ -189,14 +196,14 @@ def test(hurl_file):
             print("curl commands error at %s" % (curl_file))
             print("expected: %d commands" % len(expected_commands))
             print("actual:   %d commands" % len(actual_commands))
-            sys.exit(1)
+            return 1
 
         for i in range(len(expected_commands)):
             if actual_commands[i] != expected_commands[i]:
                 print("curl command error at %s:%i" % (curl_file, i + 1))
                 print("expected: %s" % expected_commands[i])
                 print("actual:   %s" % actual_commands[i])
-                sys.exit(1)
+                return 1
 
 
 def parse_pattern(s):
@@ -210,8 +217,13 @@ def parse_pattern(s):
 
 
 def main():
-    for hurl_file in sys.argv[1:]:
-        test(hurl_file)
+    parser = argparse.ArgumentParser()
+    parser.add_argument("file", type=str, nargs="+", metavar="FILE")
+    args = parser.parse_args()
+    for hurl_file in args.file:
+        ret = test(hurl_file=hurl_file)
+        if ret != 0:
+            sys.exit(ret)
 
 
 if __name__ == "__main__":