Add test suite for cross-envs.

Author: freakboy3742

tests/test_cross_env.py

@@ -0,0 +1,93 @@
+import os
+import platform
+import sys
+import sysconfig
+from pathlib import Path
+
+import pytest
+
+# To run these tests, the following three environment variables must be set,
+# reflecting the cross-platform environment that is in effect.'
+PYTHON_CROSS_PLATFORM = os.getenv("PYTHON_CROSS_PLATFORM", "unknown")
+PYTHON_CROSS_SLICE = os.getenv("PYTHON_CROSS_SLICE", "unknown")
+PYTHON_CROSS_MULTIARCH = os.getenv("PYTHON_CROSS_MULTIARCH", "unknown")
+
+# Determine some file system anchor points for the tests
+# Assumes that the tests are run in a virtual environment named
+# `cross-venv`,
+VENV_PREFIX = Path(__file__).parent.parent / "cross-venv"
+default_support_base = f"support/{sys.version_info.major}.{sys.version_info.minor}/{PYTHON_CROSS_PLATFORM}"
+SUPPORT_PREFIX = (
+    Path(__file__).parent.parent
+    / os.getenv("PYTHON_SUPPORT_BASE", default_support_base)
+    / "Python.xcframework"
+    / PYTHON_CROSS_SLICE
+)
+
+
+###########################################################################
+# sys
+###########################################################################
+
+def test_sys_platform():
+    assert sys.platform == PYTHON_CROSS_PLATFORM.lower()
+
+
+def test_sys_cross_compiling():
+    assert sys.cross_compiling
+
+
+def test_sys_multiarch():
+    assert sys.implementation._multiarch == PYTHON_CROSS_MULTIARCH
+
+
+def test_sys_base_prefix():
+    assert Path(sys.base_prefix) == SUPPORT_PREFIX
+
+
+def test_sys_base_exec_prefix():
+    assert Path(sys.base_exec_prefix) == SUPPORT_PREFIX
+
+
+###########################################################################
+# platform
+###########################################################################
+
+def test_platform_system():
+    assert platform.system() == PYTHON_CROSS_PLATFORM
+
+
+###########################################################################
+# sysconfig
+###########################################################################
+
+def test_sysconfig_get_platform():
+    parts = sysconfig.get_platform().split("-", 2)
+    assert parts[0] == PYTHON_CROSS_PLATFORM.lower()
+    assert parts[2] == PYTHON_CROSS_MULTIARCH
+
+
+def test_sysconfig_get_sysconfigdata_name():
+    parts = sysconfig._get_sysconfigdata_name().split("_", 4)
+    assert parts[3] == PYTHON_CROSS_PLATFORM.lower()
+    assert parts[4] == PYTHON_CROSS_MULTIARCH
+
+
+@pytest.mark.parametrize(
+    "name, prefix",
+    [
+        # Paths that should be relative to the support folder
+        ("stdlib", SUPPORT_PREFIX),
+        ("include", SUPPORT_PREFIX),
+        ("platinclude", SUPPORT_PREFIX),
+        ("stdlib", SUPPORT_PREFIX),
+        # paths that should be relative to the venv
+        ("platstdlib", VENV_PREFIX),
+        ("purelib", VENV_PREFIX),
+        ("platlib", VENV_PREFIX),
+        ("scripts", VENV_PREFIX),
+        ("data", VENV_PREFIX),
+    ]
+)
+def test_sysconfig_get_paths(name, prefix):
+    assert sysconfig.get_paths()[name].startswith(str(prefix))