pyo3-ffi: remove _PyUnicode_COMPACT_DATA from tests

Author: codeguru42

newsfragments/10489.changed.md

@@ -0,0 +1 @@
+Removed use of the CPython-internal `_PyUnicode_COMPACT_DATA` symbol from PyO3's FFI test suite.

src/ffi/tests.rs

@@ -200,8 +200,6 @@ fn ascii() {
             // 2 and 4 byte macros return nonsense for this string instance.
             assert_eq!(PyUnicode_KIND(ptr), PyUnicode_1BYTE_KIND);
 
-            #[cfg(not(Py_3_14))]
-            assert!(!_PyUnicode_COMPACT_DATA(ptr).is_null());
             // _PyUnicode_NONCOMPACT_DATA isn't valid for compact strings.
             assert!(!PyUnicode_DATA(ptr).is_null());
 
@@ -243,8 +241,6 @@ fn ucs4() {
             assert!(!PyUnicode_4BYTE_DATA(ptr).is_null());
             assert_eq!(PyUnicode_KIND(ptr), PyUnicode_4BYTE_KIND);
 
-            #[cfg(not(Py_3_14))]
-            assert!(!_PyUnicode_COMPACT_DATA(ptr).is_null());
             // _PyUnicode_NONCOMPACT_DATA isn't valid for compact strings.
             assert!(!PyUnicode_DATA(ptr).is_null());