fix bug

Author: ccsuzzh

test/cpp_extension/test_cpp_extension_ninja.py

@@ -238,40 +238,5 @@ def test_cuda_source_with_ninja(self):
         np.testing.assert_allclose(out.numpy(), pd_out.numpy(), atol=1e-5)
 
 
-class TestNinjaBuildExtension(unittest.TestCase):
-    def test_use_ninja_attribute_default(self):
-        from paddle.utils.cpp_extension.cpp_extension import BuildExtension
-
-        build_ext = BuildExtension()
-        self.assertTrue(build_ext.use_ninja, "use_ninja should default to True")
-
-    def test_use_ninja_attribute_explicit_false(self):
-        from paddle.utils.cpp_extension.cpp_extension import BuildExtension
-
-        build_ext = BuildExtension(use_ninja=False)
-        self.assertFalse(build_ext.use_ninja)
-
-    def test_use_ninja_attribute_explicit_true(self):
-        from paddle.utils.cpp_extension.cpp_extension import BuildExtension
-
-        build_ext = BuildExtension(use_ninja=True)
-        self.assertTrue(build_ext.use_ninja)
-
-    def test_use_ninja_fallback_when_unavailable(self):
-        from paddle.utils.cpp_extension.cpp_extension import BuildExtension
-
-        # Create BuildExtension with use_ninja=True
-        # If ninja is unavailable, it should fallback to False
-        build_ext = BuildExtension(use_ninja=True)
-
-        if not _is_ninja_available():
-            self.assertFalse(
-                build_ext.use_ninja,
-                "use_ninja should be False when ninja is unavailable",
-            )
-        else:
-            self.assertTrue(build_ext.use_ninja)
-
-
 if __name__ == '__main__':
     unittest.main()