adds initialization to dataclass tests

Author: tgallant

test-data/unit/check-dataclasses.test

@@ -320,6 +320,8 @@ class Application:
     name: str = 'Unnamed'
     rating: int
 
+Application(rating=5)
+
 [builtins fixtures/list.pyi]
 
 [case testDataclassesOrderingKwOnlyOnField]
@@ -331,6 +333,8 @@ class Application:
     name: str = 'Unnamed'
     rating: int = field(kw_only=True)
 
+Application(rating=5)
+
 [builtins fixtures/list.pyi]
 
 [case testDataclassesOrderingKwOnlyOnFieldFalse]
@@ -354,6 +358,8 @@ class Application:
     name: str = 'Unnamed'
     rating: int
 
+Application(rating=5)
+
 [builtins fixtures/list.pyi]
 
 [case testDataclassesOrderingKwOnlyWithSentinelAndFieldOverride]