tempfile: Add unit tests for tempfile, and don't use os.path.join.

python-stdlib/tempfile/tempfile.py

@@ -37,7 +37,7 @@ def mkdtemp(suffix=None, prefix=None, dir=None):
 
     while True:
         name = _get_candidate_name()
-        file = os.path.join(dir, prefix + name + suffix)
+        file = dir + "/" + prefix + name + suffix
         if _try(os.mkdir, file):
             return file
 

python-stdlib/tempfile/test_tempfile.py

@@ -0,0 +1,50 @@
+import os
+import tempfile
+import unittest
+
+
+class Base(unittest.TestCase):
+    def assertExists(self, fn):
+        os.stat(fn)
+
+    def assertNotExists(self, fn):
+        with self.assertRaises(OSError):
+            os.stat(fn)
+
+
+class TestMkdtemp(Base):
+    def test_no_args(self):
+        fn = tempfile.mkdtemp()
+        self.assertTrue(fn.startswith("/tmp"))
+        self.assertExists(fn)
+        os.rmdir(fn)
+
+    def test_prefix(self):
+        fn = tempfile.mkdtemp(prefix="foo")
+        self.assertTrue(fn.startswith("/tmp"))
+        self.assertTrue("foo" in fn)
+        self.assertFalse(fn.endswith("foo"))
+        self.assertExists(fn)
+        os.rmdir(fn)
+
+    def test_suffix(self):
+        fn = tempfile.mkdtemp(suffix="foo")
+        self.assertTrue(fn.startswith("/tmp"))
+        self.assertTrue(fn.endswith("foo"))
+        self.assertExists(fn)
+        os.rmdir(fn)
+
+    def test_dir(self):
+        fn = tempfile.mkdtemp(dir="tmp_micropython")
+        self.assertTrue(fn.startswith("tmp_micropython"))
+        self.assertExists(fn)
+        os.rmdir(fn)
+
+
+class TestTemporaryDirectory(Base):
+    def test_context_manager_no_args(self):
+        with tempfile.TemporaryDirectory() as fn:
+            self.assertTrue(isinstance(fn, str))
+            self.assertTrue(fn.startswith("/tmp"))
+            self.assertExists(fn)
+        self.assertNotExists(fn)