[3.8] Add test cases for dataclasses. (GH-17909) (GH-17919)

* Add test cases for dataclasses.

* Add test for repr output of field.
* Add test for ValueError to be raised when both default and default_factory are passed.
(cherry picked from commit eef1b027ab70704bcaa60a089e4ae1592c504b86)


Co-authored-by: Karthikeyan Singaravelan <tir.karthi@gmail.com>

Automerge-Triggered-By: @ericvsmith

1 files changed, 19 insertions, 0 deletions

diff --git a/Lib/test/test_dataclasses.py b/Lib/test/test_dataclasses.py
index 2f3c531fc2..21a7d7ec3f 100755
--- a/Lib/test/test_dataclasses.py
+++ b/Lib/test/test_dataclasses.py
@@ -45,6 +45,25 @@ class TestCase(unittest.TestCase):
         o = C(42)
         self.assertEqual(o.x, 42)
 
+    def test_field_default_default_factory_error(self):
+        msg = "cannot specify both default and default_factory"
+        with self.assertRaisesRegex(ValueError, msg):
+            @dataclass
+            class C:
+                x: int = field(default=1, default_factory=int)
+
+    def test_field_repr(self):
+        int_field = field(default=1, init=True, repr=False)
+        int_field.name = "id"
+        repr_output = repr(int_field)
+        expected_output = "Field(name='id',type=None," \
+                           f"default=1,default_factory={MISSING!r}," \
+                           "init=True,repr=False,hash=None," \
+                           "compare=True,metadata=mappingproxy({})," \
+                           "_field_type=None)"
+
+        self.assertEqual(repr_output, expected_output)
+
     def test_named_init_params(self):
         @dataclass
         class C: