diff --git a/e2e/binary/unbourne/BUILD.bazel b/e2e/binary/unbourne/BUILD.bazel
index 6f9d958d4d2ee6be25afe904ed710d0129077af7..ae3b2ef5255c9a021b5b93ce246d58ce40a7ac52 100644
--- a/e2e/binary/unbourne/BUILD.bazel
+++ b/e2e/binary/unbourne/BUILD.bazel
@@ -1,11 +1,22 @@
-load("@bazel_skylib//rules:build_test.bzl", "build_test")
+load("@rules_python_pytest//python_pytest:defs.bzl", "py_pytest_test")
 
-# TODO: write an _actual_ test for `unbourne`
+py_pytest_test(
+    name = "pytest",
+    size = "small",
+    srcs = ["redirect.py"],
+    data = [
+        "expected.txt",
+        "@ape//ape:unbourne",
+    ],
+    deps = [
+        "//binary:pytest",
+    ],
+)
 
-build_test(
+test_suite(
     name = "unbourne",
-    size = "small",
-    tags = ["stub"],
-    targets = ["@ape//ape:unbourne"],
+    tests = [
+        "pytest",
+    ],
     visibility = ["//:__subpackages__"],
 )
diff --git a/e2e/binary/unbourne/expected.txt b/e2e/binary/unbourne/expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ce013625030ba8dba906f756967f9e9ca394464a
--- /dev/null
+++ b/e2e/binary/unbourne/expected.txt
@@ -0,0 +1 @@
+hello
diff --git a/e2e/binary/unbourne/redirect.py b/e2e/binary/unbourne/redirect.py
new file mode 100644
index 0000000000000000000000000000000000000000..8b873fc541d82c4470b131e506f3b056b493680e
--- /dev/null
+++ b/e2e/binary/unbourne/redirect.py
@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from pathlib import Path
+from subprocess import run
+
+from binary import Diff, Relative, Tool
+
+
+def test_redirect(tool: Tool, relative: Relative, tmp_path: Path) -> None:
+    binary = tool("unbourne")
+    expected = relative("expected.txt")
+    output = tmp_path / "output.txt"
+
+    stdin = f"echo hello > {str(output)}".encode()
+    cmd = (binary,)
+    res = run(cmd, check=True, timeout=30, input=stdin,)
+
+    assert Diff(expected) == Diff(output)