diff --git a/tests/test_patch.py b/tests/test_patch.py
index 5e9b646..4c611fd 100644
--- a/tests/test_patch.py
+++ b/tests/test_patch.py
@@ -1,13 +1,38 @@
+import contextlib
+import tempfile
 from functools import wraps
 from multiprocessing import Process
 
 
 def run_test_in_subprocess(func):
+    def redirect_stdout_stderr(func, stdout, stderr, *args, **kwargs):
+        with open(stdout, "w") as stdout_file, open(stderr, "w") as stderr_file:
+            with contextlib.redirect_stdout(stdout_file), contextlib.redirect_stderr(
+                stderr_file
+            ):
+                func(*args, **kwargs)
+
     @wraps(func)
     def wrapper(*args, **kwargs):
-        p = Process(target=func, args=args, kwargs=kwargs)
-        p.start()
-        p.join()
+        with tempfile.NamedTemporaryFile(
+            mode="w+"
+        ) as stdout, tempfile.NamedTemporaryFile(mode="w+") as stderr:
+            p = Process(
+                target=redirect_stdout_stderr,
+                args=(func, stdout.name, stderr.name, *args),
+                kwargs=kwargs,
+            )
+            p.start()
+            p.join()
+            stdout_log = stdout.file.read()
+            stderr_log = stderr.file.read()
+        if p.exitcode != 0:
+            msg = f"Process exited {p.exitcode}."
+            if stdout_log:
+                msg += f"\nstdout:\n{stdout_log}"
+            if stderr_log:
+                msg += f"\nstderr:\n{stderr_log}"
+            raise RuntimeError(msg)
 
     return wrapper