Issue #23392: Added tests for marshal C API that works with FILE*.

Lib/test/test_marshal.py

@@ -7,6 +7,11 @@ import unittest
 import os
 import types
 
+try:
+    import _testcapi
+except ImportError:
+    _testcapi = None
+
 class HelperMixin:
     def helper(self, sample, *extra):
         new = marshal.loads(marshal.dumps(sample, *extra))
@@ -434,18 +439,88 @@ class InterningTestCase(unittest.TestCase, HelperMixin):
         s2 = sys.intern(s)
         self.assertNotEqual(id(s2), id(s))
 
+@support.cpython_only
+@unittest.skipUnless(_testcapi, 'requires _testcapi')
+class CAPI_TestCase(unittest.TestCase, HelperMixin):
+
+    def test_write_long_to_file(self):
+        for v in range(marshal.version + 1):
+            _testcapi.pymarshal_write_long_to_file(0x12345678, support.TESTFN, v)
+            with open(support.TESTFN, 'rb') as f:
+                data = f.read()
+            support.unlink(support.TESTFN)
+            self.assertEqual(data, b'\x78\x56\x34\x12')
+
+    def test_write_object_to_file(self):
+        obj = ('\u20ac', b'abc', 123, 45.6, 7+8j, 'long line '*1000)
+        for v in range(marshal.version + 1):
+            _testcapi.pymarshal_write_object_to_file(obj, support.TESTFN, v)
+            with open(support.TESTFN, 'rb') as f:
+                data = f.read()
+            support.unlink(support.TESTFN)
+            self.assertEqual(marshal.loads(data), obj)
+
+    def test_read_short_from_file(self):
+        with open(support.TESTFN, 'wb') as f:
+            f.write(b'\x34\x12xxxx')
+        r, p = _testcapi.pymarshal_read_short_from_file(support.TESTFN)
+        support.unlink(support.TESTFN)
+        self.assertEqual(r, 0x1234)
+        self.assertEqual(p, 2)
+
+        with open(support.TESTFN, 'wb') as f:
+            f.write(b'\x12')
+        with self.assertRaises(EOFError):
+            _testcapi.pymarshal_read_short_from_file(support.TESTFN)
+        support.unlink(support.TESTFN)
+
+    def test_read_long_from_file(self):
+        with open(support.TESTFN, 'wb') as f:
+            f.write(b'\x78\x56\x34\x12xxxx')
+        r, p = _testcapi.pymarshal_read_long_from_file(support.TESTFN)
+        support.unlink(support.TESTFN)
+        self.assertEqual(r, 0x12345678)
+        self.assertEqual(p, 4)
+
+        with open(support.TESTFN, 'wb') as f:
+            f.write(b'\x56\x34\x12')
+        with self.assertRaises(EOFError):
+            _testcapi.pymarshal_read_long_from_file(support.TESTFN)
+        support.unlink(support.TESTFN)
+
+    def test_read_last_object_from_file(self):
+        obj = ('\u20ac', b'abc', 123, 45.6, 7+8j)
+        for v in range(marshal.version + 1):
+            data = marshal.dumps(obj, v)
+            with open(support.TESTFN, 'wb') as f:
+                f.write(data + b'xxxx')
+            r, p = _testcapi.pymarshal_read_last_object_from_file(support.TESTFN)
+            support.unlink(support.TESTFN)
+            self.assertEqual(r, obj)
+
+            with open(support.TESTFN, 'wb') as f:
+                f.write(data[:1])
+            with self.assertRaises(EOFError):
+                _testcapi.pymarshal_read_last_object_from_file(support.TESTFN)
+            support.unlink(support.TESTFN)
+
+    def test_read_object_from_file(self):
+        obj = ('\u20ac', b'abc', 123, 45.6, 7+8j)
+        for v in range(marshal.version + 1):
+            data = marshal.dumps(obj, v)
+            with open(support.TESTFN, 'wb') as f:
+                f.write(data + b'xxxx')
+            r, p = _testcapi.pymarshal_read_object_from_file(support.TESTFN)
+            support.unlink(support.TESTFN)
+            self.assertEqual(r, obj)
+            self.assertEqual(p, len(data))
+
+            with open(support.TESTFN, 'wb') as f:
+                f.write(data[:1])
+            with self.assertRaises(EOFError):
+                _testcapi.pymarshal_read_object_from_file(support.TESTFN)
+            support.unlink(support.TESTFN)
 
-def test_main():
-    support.run_unittest(IntTestCase,
-                         FloatTestCase,
-                         StringTestCase,
-                         CodeTestCase,
-                         ContainerTestCase,
-                         ExceptionTestCase,
-                         BufferTestCase,
-                         BugsTestCase,
-                         LargeValuesTestCase,
-                        )
 
 if __name__ == "__main__":
-    test_main()
+    unittest.main()