Add test for py_pex_binary

py/tests/py-pex-binary/BUILD.bazel

@@ -0,0 +1,33 @@
+load("@aspect_bazel_lib//lib:testing.bzl", "assert_contains")
+load("//py:defs.bzl", "py_binary", "py_pex_binary")
+
+# Test that both single-file modules (six) and multi-file modules (cowsay) work with py_pex_binary.
+py_binary(
+    name = "print_modules_bin",
+    srcs = ["print_modules.py"],
+    data = ["data.txt"],
+    deps = [
+        "@bazel_tools//tools/python/runfiles",
+        "@pypi_cowsay//:pkg",
+        "@pypi_six//:pkg",
+    ],
+)
+
+py_pex_binary(
+    name = "print_modules_pex",
+    binary = ":print_modules_bin",
+)
+
+# PEX_ROOT is set to avoid warning on default user PEX_ROOT not being writable
+genrule(
+    name = "run_print_modules_pex",
+    outs = ["print_modules_pex.out"],
+    cmd = "PEX_ROOT=.pex $(execpath print_modules_pex) >$@",
+    tools = ["print_modules_pex"],
+)
+
+assert_contains(
+    name = "test__print_modules_pex",
+    actual = "print_modules_pex.out",
+    expected = "Mooo!,cowsay-6.1/cowsay/__init__.py,six-1.16.0/six.py",
+)

py/tests/py-pex-binary/data.txt

@@ -0,0 +1 @@
+Mooo!

requirements.in

@@ -5,3 +5,4 @@ pytest
 cowsay
 ftfy==6.2.0
 neptune==1.10.2
+six

requirements.txt

@@ -770,6 +770,7 @@ six==1.16.0 \
     --hash=sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926 \
     --hash=sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254
     # via
+    #   -r requirements.in
     #   bravado
     #   bravado-core
     #   neptune