Add a test which uses a forward reference as a type annotation of an argument

stubgenj/tests/stubtest/test-data/unit/forward_declaration.test

+
+[case testArgumentTypeDeclaration]
+import jpype
+import typing
+
+if typing.TYPE_CHECKING:
+    import java.util
+
+def foo(arg: "java.util.Formatter"):
+    reveal_type(arg)         # N: Revealed type is "java.util.Formatter"

stubgenj/tests/stubtest/test-data/unit/jpype_jpackage.test

@@ -15,4 +15,3 @@ java = jpype.JPackage("java")
 int_list: typing.List[int] = [42]
 
 reveal_type(java.util.ArrayList(int_list))         # N: Revealed type is "java.util.ArrayList[Any]"
-

stubgenj/tests/test_stubtest.py

@@ -43,9 +43,20 @@ def setup_mypy_for_data_driven_tests(stub_tmpdir: str):
 
 def test_generate_stubs(stub_tmpdir):
     import java.util  # noqa
-    stubgenj.generateJavaStubs([java.util], useStubsSuffix=True, outputDir=stub_tmpdir)
+    stubgenj.generateJavaStubs(
+        [java.util],
+        useStubsSuffix=True, outputDir=stub_tmpdir,
+    )
 
 
 @pytest.mark.trylast
 class StubTestSuite(mypy.test.testcheck.TypeCheckSuite):
-    files = ['arraylist.test', 'hashmap.test', 'enummap.test', 'callbacks.test', 'jpype_jpackage.test', 'varargs.test']
+    files = [
+        'arraylist.test',
+        'callbacks.test',
+        'enummap.test',
+        'forward_declaration.test',
+        'hashmap.test',
+        'jpype_jpackage.test',
+        'varargs.test',
+    ]