Add a rudimentary test for the platform module that at least calls each

documented function once.

Lib/test/test_platform.py

+import unittest
+from test import test_support
+import platform
+
+class PlatformTest(unittest.TestCase):
+    def test_architecture(self):
+        res = platform.architecture()
+
+    def test_machine(self):
+        res = platform.machine()
+
+    def test_node(self):
+        res = platform.node()
+
+    def test_platform(self):
+        for aliased in (False, True):
+            for terse in (False, True):
+                res = platform.platform(aliased, terse)
+
+    def test_processor(self):
+        res = platform.processor()
+
+    def test_python_build(self):
+        res = platform.python_build()
+
+    def test_python_compiler(self):
+        res = platform.python_compiler()
+
+    def test_version(self):
+        res1 = platform.version()
+        res2 = platform.version_tuple()
+        self.assertEqual(res1, ".".join(res2))
+
+    def test_release(self):
+        res = platform.release()
+
+    def test_system(self):
+        res = platform.system()
+
+    def test_version(self):
+        res = platform.version()
+
+    def test_system_alias(self):
+        res = platform.system_alias(
+            platform.system(),
+            platform.release(),
+            platform.version(),
+        )
+
+    def test_uname(self):
+        res = platform.uname()
+
+    def test_java_ver(self):
+        res = platform.java_ver()
+
+    def test_win32_ver(self):
+        res = platform.win32_ver()
+
+    def test_mac_ver(self):
+        res = platform.mac_ver()
+
+    def test_dist(self):
+        res = platform.dist()
+
+    def test_libc_ver(self):
+        res = platform.libc_ver()
+
+def test_main():
+    test_support.run_unittest(
+        PlatformTest
+    )
+
+if __name__ == '__main__':
+    test_main()