Add init cases for dataclass

test/test_inference/test_signature.py

@@ -318,40 +318,101 @@ def test_wraps_signature(Script, code, signature):
 
 
 @pytest.mark.parametrize(
-    'start, start_params', [
-        ['@dataclass\nclass X:', []],
-        ['@dataclass(eq=True)\nclass X:', []],
-        [dedent('''
+    "start, start_params, include_params",
+    [
+        ["@dataclass\nclass X:", [], True],
+        ["@dataclass(eq=True)\nclass X:", [], True],
+        [
+            dedent(
+                """
          class Y():
              y: int
          @dataclass
-         class X(Y):'''), []],
-        [dedent('''
+         class X(Y):"""
+            ),
+            [],
+            True,
+        ],
+        [
+            dedent(
+                """
          @dataclass
          class Y():
              y: int
              z = 5
          @dataclass
-         class X(Y):'''), ['y']],
-    ]
+         class X(Y):"""
+            ),
+            ["y"],
+            True,
+        ],
+        # init=False
+        [
+            dedent(
+                """
+            @dataclass_transform(init=False)
+            class Y():
+                y: int
+                z = 5
+            class X(Y):"""
+            ),
+            [],
+            False,
+        ],
+        # custom init
+        [
+            dedent(
+                """
+        @dataclass_transform()
+        class Y():
+            y: int
+            z = 5
+        class X(Y):
+            def __init__(self, toto: str):
+                pass
+            """
+            ),
+            ["toto"],
+            False,
+        ],
+    ],
+    ids=[
+        "direct_transformed",
+        "transformed_with_params",
+        "subclass_transformed",
+        "both_transformed",
+        "init_false",
+        "custom_init",
+    ],
 )
-def test_dataclass_signature(Script, skip_pre_python37, start, start_params):
-    code = dedent('''
+def test_dataclass_signature(
+    Script, skip_pre_python37, start, start_params, include_params
+):
+    code = dedent(
+        """
             name: str
             foo = 3
             price: float
             quantity: int = 0.0
 
-        X(''')
+        X("""
+    )
 
     code = 'from dataclasses import dataclass\n' + start + code
 
     sig, = Script(code).get_signatures()
-    assert [p.name for p in sig.params] == start_params + ['name', 'price', 'quantity']
-    quantity, = sig.params[-1].infer()
-    assert quantity.name == 'int'
-    price, = sig.params[-2].infer()
-    assert price.name == 'float'
+    expected_params = (
+        [*start_params, "name", "price", "quantity"]
+        if include_params
+        else [*start_params]
+    )
+    assert [p.name for p in sig.params] == expected_params
+
+    if include_params:
+        quantity, = sig.params[-1].infer()
+        assert quantity.name == 'int'
+        price, = sig.params[-2].infer()
+        assert price.name == 'float'
 
 
 dataclass_transform_cases = [