diff --git a/e2e/binary/expand/BUILD.bazel b/e2e/binary/expand/BUILD.bazel
index 2a3ea4083461eb58551ea41a86ac47a6d7874ef9..f5ff887623f77028268d172ae3d904bfb5830cd3 100644
--- a/e2e/binary/expand/BUILD.bazel
+++ b/e2e/binary/expand/BUILD.bazel
@@ -1,11 +1,32 @@
-load("@bazel_skylib//rules:build_test.bzl", "build_test")
+load("@rules_python_pytest//python_pytest:defs.bzl", "py_pytest_test")
+load("@bazel_skylib//rules:native_binary.bzl", "native_test")
 
-# TODO: write an _actual_ test for `expand`
+py_pytest_test(
+    name = "pytest",
+    size = "small",
+    srcs = ["expand.py"],
+    data = [
+        "fixture.txt",
+        "expected.txt",
+        "@ape//ape:expand",
+    ],
+    deps = [
+        "//binary:pytest",
+    ],
+)
 
-build_test(
-    name = "expand",
+native_test(
+    name = "version",
     size = "small",
-    tags = ["stub"],
-    targets = ["@ape//ape:expand"],
+    src = "@ape//ape:expand",
+    args = ["--version"],
+)
+
+test_suite(
+    name = "expand",
+    tests = [
+        "pytest",
+        "version",
+    ],
     visibility = ["//:__subpackages__"],
 )
diff --git a/e2e/binary/expand/expand.py b/e2e/binary/expand/expand.py
new file mode 100644
index 0000000000000000000000000000000000000000..827ed8e26081b9c6f360a34cd565b5c7f2ac78da
--- /dev/null
+++ b/e2e/binary/expand/expand.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_expand(tool: Tool, relative: Relative, tmp_path: Path) -> None:
+    binary = tool("expand")
+    fixture = relative("fixture.txt")
+    expected = relative("expected.txt")
+    output = tmp_path / "output.txt"
+
+    cmd = (binary, fixture)
+    with open(output, "w") as stream:
+        run(cmd, check=True, timeout=30, stdout=stream)
+    assert Diff(expected) == Diff(output)
diff --git a/e2e/binary/expand/expected.txt b/e2e/binary/expand/expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..fbb6a06c2b67c9eaa09b638a608aa28272f8755f
--- /dev/null
+++ b/e2e/binary/expand/expected.txt
@@ -0,0 +1 @@
+        Tabs    To      Spaces  
\ No newline at end of file
diff --git a/e2e/binary/expand/fixture.txt b/e2e/binary/expand/fixture.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f47d2291ada542a26fc8b2728c4d0d2d07226da8
--- /dev/null
+++ b/e2e/binary/expand/fixture.txt
@@ -0,0 +1 @@
+	Tabs	To	Spaces	
\ No newline at end of file